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Arena EJ. Weak gravitational flexion in various spacetimes: Exotic lenses and modified gravity. Int J Clin Exp Med 2022. [DOI: 10.1103/physrevd.106.064019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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2
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Singularity-Free and Cosmologically Viable Born-Infeld Gravity with Scalar Matter. Symmetry (Basel) 2021. [DOI: 10.3390/sym13112108] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The early cosmology, driven by a single scalar field, both massless and massive, in the context of Eddington-inspired Born-Infeld gravity, is explored. We show the existence of nonsingular solutions of bouncing and loitering type (depending on the sign of the gravitational theory’s parameter, ϵ) replacing the Big Bang singularity, and discuss their properties. In addition, in the massive case, we find some new features of the cosmological evolution depending on the value of the mass parameter, including asymmetries in the expansion/contraction phases, or a continuous transition between a contracting phase to an expanding one via an intermediate loitering phase. We also provide a combined analysis of cosmic chronometers, standard candles, BAO, and CMB data to constrain the model, finding that for roughly |ϵ|≲5·10−8m2 the model is compatible with the latest observations while successfully removing the Big Bang singularity. This bound is several orders of magnitude stronger than the most stringent constraints currently available in the literature.
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Bermejo-Climent JR, Ballardini M, Finelli F, Paoletti D, Maartens R, Rubiño-Martín JA, Valenziano L. Cosmological parameter forecasts by a joint 2D tomographic approach to CMB and galaxy clustering. Int J Clin Exp Med 2021. [DOI: 10.1103/physrevd.103.103502] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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4
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Chacko Z, Dev A, Du P, Poulin V, Tsai Y. Determining the neutrino lifetime from cosmology. Int J Clin Exp Med 2021. [DOI: 10.1103/physrevd.103.043519] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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5
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Calderón R, Gannouji R, L’Huillier B, Polarski D. Negative cosmological constant in the dark sector? Int J Clin Exp Med 2021. [DOI: 10.1103/physrevd.103.023526] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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6
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Towards simulating a realistic data analysis with an optimised angular power spectrum of spectroscopic galaxy surveys. EXPERIMENTAL RESULTS 2020. [DOI: 10.1017/exp.2020.59] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
AbstractThe angular power spectrum is a natural tool to analyse the observed galaxy number count fluctuations. In a standard analysis, the angular galaxy distribution is sliced into concentric redshift bins and all correlations of its harmonic coefficients between bin pairs are considered—a procedure referred to as ‘tomography’. However, the unparalleled quality of data from oncoming spectroscopic galaxy surveys for cosmology will render this method computationally unfeasible, given the increasing number of bins. Here, we put to test against synthetic data a novel method proposed in a previous study to save computational time. According to this method, the whole galaxy redshift distribution is subdivided into thick bins, neglecting the cross-bin correlations among them; each of the thick bin is, however, further subdivided into thinner bins, considering in this case all the cross-bin correlations. We create a simulated data set that we then analyse in a Bayesian framework. We confirm that the newly proposed method saves computational time and gives results that surpass those of the standard approach.
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Arai S, Karmakar P, Nishizawa A. Cosmological evolution of viable models in the generalized scalar-tensor theory. Int J Clin Exp Med 2020. [DOI: 10.1103/physrevd.102.024003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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8
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Abstract
This review is a pedagogical introduction to models of gravity and how they are constrained through cosmological observations. We focus on the Horndeski scalar-tensor theory and on the quantities that can be measured with a minimum of assumptions. Alternatives or extensions of general relativity have been proposed ever since its early years. Because of the Lovelock theorem, modifying gravity in four dimensions typically means adding new degrees of freedom. The simplest way is to include a scalar field coupled to the curvature tensor terms. The most general way of doing so without incurring in the Ostrogradski instability is the Horndeski Lagrangian and its extensions. Testing gravity means therefore, in its simplest term, testing the Horndeski Lagrangian. Since local gravity experiments can always be evaded by assuming some screening mechanism or that baryons are decoupled, or even that the effects of modified gravity are visible only at early times, we need to test gravity with cosmological observations in the late universe (large-scale structure) and in the early universe (cosmic microwave background). In this work, we review the basic tools to test gravity at cosmological scales, focusing on model-independent measurements.
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Barros BJ, Barreiro T, Nunes NJ. Spherical collapse in coupled quintessence with a
ΛCDM
background. Int J Clin Exp Med 2020. [DOI: 10.1103/physrevd.101.023502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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10
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The Hunt for Primordial Interactions in the Large-Scale Structures of the Universe. GALAXIES 2019. [DOI: 10.3390/galaxies7030071] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The understanding of the primordial mechanism that seeded the cosmic structures we observe today in the sky is one of the major goals in cosmology. The leading paradigm for such a mechanism is provided by the inflationary scenario, a period of violent accelerated expansion in the very early stages of evolution of the universe. While our current knowledge of the physics of inflation is limited to phenomenological models which fit observations, an exquisite understanding of the particle content and interactions taking place during inflation would provide breakthroughs in our understanding of fundamental physics at high energies. In this review, we summarize recent theoretical progress in the modeling of the imprint of primordial interactions in the large-scale structures of the universe. We focus specifically on the effects of such interactions on the statistical distribution of dark-matter halos, providing a consistent treatment of the steps required to connect the correlations generated among fields during inflation all the way to the late-time correlations of halos.
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12
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Heisenberg L, Ramírez H, Tsujikawa S. Inflation with mixed helicities and its observational imprint on CMB. Int J Clin Exp Med 2019. [DOI: 10.1103/physrevd.99.023505] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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13
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Ishak M. Testing general relativity in cosmology. LIVING REVIEWS IN RELATIVITY 2018; 22:1. [PMID: 30613193 PMCID: PMC6299071 DOI: 10.1007/s41114-018-0017-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Accepted: 11/06/2018] [Indexed: 06/09/2023]
Abstract
We review recent developments and results in testing general relativity (GR) at cosmological scales. The subject has witnessed rapid growth during the last two decades with the aim of addressing the question of cosmic acceleration and the dark energy associated with it. However, with the advent of precision cosmology, it has also become a well-motivated endeavor by itself to test gravitational physics at cosmic scales. We overview cosmological probes of gravity, formalisms and parameterizations for testing deviations from GR at cosmological scales, selected modified gravity (MG) theories, gravitational screening mechanisms, and computer codes developed for these tests. We then provide summaries of recent cosmological constraints on MG parameters and selected MG models. We supplement these cosmological constraints with a summary of implications from the recent binary neutron star merger event. Next, we summarize some results on MG parameter forecasts with and without astrophysical systematics that will dominate the uncertainties. The review aims at providing an overall picture of the subject and an entry point to students and researchers interested in joining the field. It can also serve as a quick reference to recent results and constraints on testing gravity at cosmological scales.
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Affiliation(s)
- Mustapha Ishak
- Department of Physics, The University of Texas at Dallas, Richardson, TX 75080 USA
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15
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Gallagher CS, Clifton T. Relativistic Euler equations in cosmologies with nonlinear structures. Int J Clin Exp Med 2018. [DOI: 10.1103/physrevd.98.103516] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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16
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Avsajanishvili O, Huang Y, Samushia L, Kahniashvili T. The observational constraints on the flat ϕ CDM models. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS 2018; 78:773. [PMID: 30956562 PMCID: PMC6413532 DOI: 10.1140/epjc/s10052-018-6233-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 09/10/2018] [Indexed: 06/09/2023]
Abstract
Most dark energy models have the Λ CDM as their limit, and if future observations constrain our universe to be close to Λ CDM Bayesian arguments about the evidence and the fine-tuning will have to be employed to discriminate between the models. Assuming a baseline Λ CDM model we investigate a number of quintessence and phantom dark energy models, and we study how they would perform when compared to observational data, such as the expansion rate, the angular distance, and the growth rate measurements, from the upcoming Dark Energy Spectroscopic Instrument (DESI) survey. We sample posterior likelihood surfaces of these dark energy models with Monte Carlo Markov Chains while using central values consistent with the Planck Λ CDM universe and covariance matrices estimated with Fisher information matrix techniques. We find that for this setup the Bayes factor provides a substantial evidence in favor of the Λ CDM model over most of the alternatives. We also investigated how well the CPL parametrization approximates various scalar field dark energy models, and identified the location for each dark energy model in the CPL parameter space.
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Affiliation(s)
- Olga Avsajanishvili
- Abastumani Astrophysical Observatory, Ilia State University, 3-5 Cholokashvili Ave., 0194 Tbilisi, Georgia
| | - Yiwen Huang
- Department of Physics, University of California, San Diego, La Jolla, CA 92093 USA
| | - Lado Samushia
- Abastumani Astrophysical Observatory, Ilia State University, 3-5 Cholokashvili Ave., 0194 Tbilisi, Georgia
- Department of Physics, Kansas State University, 116 Cardwell Hall, Manhattan, KS 66506 USA
| | - Tina Kahniashvili
- Abastumani Astrophysical Observatory, Ilia State University, 3-5 Cholokashvili Ave., 0194 Tbilisi, Georgia
- McWilliams Center for Cosmology and Department of Physics, Carnegie Mellon University, 5000 Forbes Ave, Pittsburgh, PA 15213 USA
- Department of Physics, Laurentian University, Ramsey Lake Road, Sudbury, ON P3E 2C Canada
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17
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Castorina E, Feng Y, Seljak U, Villaescusa-Navarro F. Primordial Non-Gaussianities and Zero-Bias Tracers of the Large-Scale Structure. PHYSICAL REVIEW LETTERS 2018; 121:101301. [PMID: 30240255 DOI: 10.1103/physrevlett.121.101301] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 07/25/2018] [Indexed: 06/08/2023]
Abstract
We develop a new method to constrain primordial non-Gaussianities of the local kind using unclustered tracers of the large scale structure. We show that, in the limit of low noise, zero bias tracers yield large improvement over standard methods, mostly due to vanishing sampling variance. We propose a simple technique to construct such a tracer, using environmental information obtained from the original sample and validate our method with N-body simulations. Our results indicate that σ_{f_{NL}^{loc}}≃1 can be reached using only information on a single tracer of sufficiently high number density.
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Affiliation(s)
- Emanuele Castorina
- Berkeley Center for Cosmological Physics, University of California, Berkeley, California 94720, USA
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 93720, USA
| | - Yu Feng
- Berkeley Center for Cosmological Physics, University of California, Berkeley, California 94720, USA
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 93720, USA
| | - Uroš Seljak
- Berkeley Center for Cosmological Physics, University of California, Berkeley, California 94720, USA
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 93720, USA
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18
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The SDSS-IV Extended Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations at Redshift of 0.72 with the DR14 Luminous Red Galaxy Sample. ACTA ACUST UNITED AC 2018. [DOI: 10.3847/1538-4357/aacea5] [Citation(s) in RCA: 97] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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19
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Zhu HM, Pen UL, Yu Y, Chen X. Recovering lost 21 cm radial modes via cosmic tidal reconstruction. Int J Clin Exp Med 2018. [DOI: 10.1103/physrevd.98.043511] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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20
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Heisenberg L, Kase R, Tsujikawa S. Odd-parity stability of hairy black holes in
U(1)
gauge-invariant scalar-vector-tensor theories. Int J Clin Exp Med 2018. [DOI: 10.1103/physrevd.97.124043] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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21
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Zhan H, Anthony Tyson J. Cosmology with the Large Synoptic Survey Telescope: an overview. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2018; 81:066901. [PMID: 29473548 DOI: 10.1088/1361-6633/aab1bd] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The Large Synoptic Survey Telescope (LSST) is a high étendue imaging facility that is being constructed atop Cerro Pachón in northern Chile. It is scheduled to begin science operations in 2022. With an [Formula: see text] ([Formula: see text] effective) aperture, a novel three-mirror design achieving a seeing-limited [Formula: see text] field of view, and a 3.2 gigapixel camera, the LSST has the deep-wide-fast imaging capability necessary to carry out an [Formula: see text] survey in six passbands (ugrizy) to a coadded depth of [Formula: see text] over 10 years using [Formula: see text] of its observational time. The remaining [Formula: see text] of the time will be devoted to considerably deeper and faster time-domain observations and smaller surveys. In total, each patch of the sky in the main survey will receive 800 visits allocated across the six passbands with [Formula: see text] exposure visits. The huge volume of high-quality LSST data will provide a wide range of science opportunities and, in particular, open a new era of precision cosmology with unprecedented statistical power and tight control of systematic errors. In this review, we give a brief account of the LSST cosmology program with an emphasis on dark energy investigations. The LSST will address dark energy physics and cosmology in general by exploiting diverse precision probes including large-scale structure, weak lensing, type Ia supernovae, galaxy clusters, and strong lensing. Combined with the cosmic microwave background data, these probes form interlocking tests on the cosmological model and the nature of dark energy in the presence of various systematics. The LSST data products will be made available to the US and Chilean scientific communities and to international partners with no proprietary period. Close collaborations with contemporaneous imaging and spectroscopy surveys observing at a variety of wavelengths, resolutions, depths, and timescales will be a vital part of the LSST science program, which will not only enhance specific studies but, more importantly, also allow a more complete understanding of the Universe through different windows.
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Affiliation(s)
- Hu Zhan
- CAS Key Laboratory of Space Astronomy and Technology, National Astronomical Observatories, A20 Datun Road, Chaoyang District, Beijing 100012, People's Republic of China
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22
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Andrade U, Bengaly C, Alcaniz J, Santos B. Isotropy of low redshift type Ia supernovae: A Bayesian analysis. Int J Clin Exp Med 2018. [DOI: 10.1103/physrevd.97.083518] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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23
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Amendola L, Kunz M, Saltas ID, Sawicki I. Fate of Large-Scale Structure in Modified Gravity After GW170817 and GRB170817A. PHYSICAL REVIEW LETTERS 2018; 120:131101. [PMID: 29694183 DOI: 10.1103/physrevlett.120.131101] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Revised: 02/07/2018] [Indexed: 06/08/2023]
Abstract
The coincident detection of gravitational waves (GW) and a gamma-ray burst from a merger of neutron stars has placed an extremely stringent bound on the speed of GWs. We showed previously that the presence of gravitational slip (η) in cosmology is intimately tied to modifications of GW propagation. This new constraint implies that the only remaining viable source of gravitational slip is a conformal coupling to gravity in scalar-tensor theories, while viable vector-tensor theories cannot now generate gravitational slip at all. We discuss structure formation in the remaining viable models, demonstrating that (i) the dark-matter growth rate must now be at least as fast as in general relativity (GR), with the possible exception of that beyond the Horndeski model, and (ii) if there is any scale dependence at all in the slip parameter, it is such that it takes the GR value at large scales. We show a consistency relation that must be violated if gravity is modified.
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Affiliation(s)
- Luca Amendola
- InstiQuai Ernest Ansermettut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany
| | - Martin Kunz
- Départment de Physique Théorique and Center for Astroparticle Physics, Université de Genève, Quai Ernest Ansermet 24, CH-1211 Genéve 4, Switzerland
| | - Ippocratis D Saltas
- CEICO, Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 182 21 Praha 8, Czechia
| | - Ignacy Sawicki
- CEICO, Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 182 21 Praha 8, Czechia
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24
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Martins CJAP. The status of varying constants: a review of the physics, searches and implications. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2017; 80:126902. [PMID: 28805650 DOI: 10.1088/1361-6633/aa860e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The observational evidence for the recent acceleration of the universe demonstrates that canonical theories of cosmology and particle physics are incomplete-if not incorrect-and that new physics is out there, waiting to be discovered. A key task for the next generation of laboratory and astrophysical facilities is to search for, identify and ultimately characterize this new physics. Here we highlight recent developments in tests of the stability of nature's fundamental couplings, which provide a direct handle on new physics: a detection of variations will be revolutionary, but even improved null results provide competitive constraints on a range of cosmological and particle physics paradigms. A joint analysis of all currently available data shows a preference for variations of α and μ at about the two-sigma level, but inconsistencies between different sub-sets (likely due to hidden systematics) suggest that these statistical preferences need to be taken with caution. On the other hand, these measurements strongly constrain Weak Equivalence Principle violations. Plans and forecasts for forthcoming studies with facilities such as ALMA, ESPRESSO and the ELT, which should clarify these issues, are also discussed, and synergies with other probes are briefly highlighted. The goal is to show how a new generation of precision consistency tests of the standard paradigm will soon become possible.
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Affiliation(s)
- C J A P Martins
- Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal. Instituto de Astrofísica e Ciências do Espaço, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal
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25
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Tattersall OJ, Lagos M, Ferreira PG. Covariant approach to parametrized cosmological perturbations. Int J Clin Exp Med 2017. [DOI: 10.1103/physrevd.96.064011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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26
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De Felice A, Heisenberg L, Tsujikawa S. Observational constraints on generalized Proca theories. Int J Clin Exp Med 2017. [DOI: 10.1103/physrevd.95.123540] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Tutusaus I, Lamine B, Blanchard A, Dupays A, Rousset Y, Zolnierowski Y. Dark sectors of the Universe: A Euclid survey approach. Int J Clin Exp Med 2016. [DOI: 10.1103/physrevd.94.123515] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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29
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Heisenberg L, Kase R, Tsujikawa S. Absence of solid angle deficit singularities in beyond-generalized proca theories. Int J Clin Exp Med 2016. [DOI: 10.1103/physrevd.94.123513] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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30
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31
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Burrage C, Copeland EJ, Millington P. Radiative Screening of Fifth Forces. PHYSICAL REVIEW LETTERS 2016; 117:211102. [PMID: 27911565 DOI: 10.1103/physrevlett.117.211102] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Indexed: 06/06/2023]
Abstract
We describe a symmetron model in which the screening of fifth forces arises at the one-loop level through the Coleman-Weinberg mechanism of spontaneous symmetry breaking. We show that such a theory can avoid current constraints on the existence of fifth forces but still has the potential to give rise to observable deviations from general relativity, which could be seen in cold atom experiments.
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Affiliation(s)
- Clare Burrage
- School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom
| | - Edmund J Copeland
- School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom
| | - Peter Millington
- School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom
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33
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Wang B, Abdalla E, Atrio-Barandela F, Pavón D. Dark matter and dark energy interactions: theoretical challenges, cosmological implications and observational signatures. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2016; 79:096901. [PMID: 27517328 DOI: 10.1088/0034-4885/79/9/096901] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Models where dark matter and dark energy interact with each other have been proposed to solve the coincidence problem. We review the motivations underlying the need to introduce such interaction, its influence on the background dynamics and how it modifies the evolution of linear perturbations. We test models using the most recent observational data and we find that the interaction is compatible with the current astronomical and cosmological data. Finally, we describe the forthcoming data sets from current and future facilities that are being constructed or designed that will allow a clearer understanding of the physics of the dark sector.
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Affiliation(s)
- B Wang
- Department of Physics and Astronomy, Shanghai Jiao Tong University, People's Republic of China
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34
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Liu X, Li B, Zhao GB, Chiu MC, Fang W, Pan C, Wang Q, Du W, Yuan S, Fu L, Fan Z. Constraining f(R) Gravity Theory Using Weak Lensing Peak Statistics from the Canada-France-Hawaii-Telescope Lensing Survey. PHYSICAL REVIEW LETTERS 2016; 117:051101. [PMID: 27517761 DOI: 10.1103/physrevlett.117.051101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Indexed: 06/06/2023]
Abstract
In this Letter, we report the observational constraints on the Hu-Sawicki f(R) theory derived from weak lensing peak abundances, which are closely related to the mass function of massive halos. In comparison with studies using optical or x-ray clusters of galaxies, weak lensing peak analyses have the advantages of not relying on mass-baryonic observable calibrations. With observations from the Canada-France-Hawaii-Telescope Lensing Survey, our peak analyses give rise to a tight constraint on the model parameter |f_{R0}| for n=1. The 95% C.L. is log_{10}|f_{R0}|<-4.82 given WMAP9 priors on (Ω_{m}, A_{s}). With Planck15 priors, the corresponding result is log_{10}|f_{R0}|<-5.16.
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Affiliation(s)
- Xiangkun Liu
- Department of Astronomy, School of Physics, Peking University, Beijing 100871, People's Republic of China
| | - Baojiu Li
- Institute for Computational Cosmology, Department of Physics, Durham University, South Road, Durham DH1 3LE, United Kingdom
| | - Gong-Bo Zhao
- National Astronimical Observatories, Chinese Academy of Sciences, Beijing 100012, People's Republic of China
- Institute of Cosmology & Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth PO1 3FX, United Kingdom
| | - Mu-Chen Chiu
- The Shanghai Key Lab for Astrophysics, Shanghai Normal University, 100 Guilin Road, Shanghai 200234, People's Republic of China
| | - Wei Fang
- The Shanghai Key Lab for Astrophysics, Shanghai Normal University, 100 Guilin Road, Shanghai 200234, People's Republic of China
- Department of Physics, Shanghai Normal University, 100 Guilin Road, Shanghai 200234, People's Republic of China
| | - Chuzhong Pan
- Department of Astronomy, School of Physics, Peking University, Beijing 100871, People's Republic of China
| | - Qiao Wang
- Key Laboratory for Computational Astrophysics, The Partner Group of Max Planck Institute for Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People's Republic of China
| | - Wei Du
- National Astronimical Observatories, Chinese Academy of Sciences, Beijing 100012, People's Republic of China
| | - Shuo Yuan
- Department of Astronomy, School of Physics, Peking University, Beijing 100871, People's Republic of China
| | - Liping Fu
- The Shanghai Key Lab for Astrophysics, Shanghai Normal University, 100 Guilin Road, Shanghai 200234, People's Republic of China
| | - Zuhui Fan
- Department of Astronomy, School of Physics, Peking University, Beijing 100871, People's Republic of China
- Collaborative Innovation Center of Modern Astronomy and Space Exploration, Nanjing 210093, People's Republic of China
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Bentivegna E, Bruni M. Effects of Nonlinear Inhomogeneity on the Cosmic Expansion with Numerical Relativity. PHYSICAL REVIEW LETTERS 2016; 116:251302. [PMID: 27391711 DOI: 10.1103/physrevlett.116.251302] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Indexed: 06/06/2023]
Abstract
We construct a three-dimensional, fully relativistic numerical model of a universe filled with an inhomogeneous pressureless fluid, starting from initial data that represent a perturbation of the Einstein-de Sitter model. We then measure the departure of the average expansion rate with respect to this homogeneous and isotropic reference model, comparing local quantities to the predictions of linear perturbation theory. We find that collapsing perturbations reach the turnaround point much earlier than expected from the reference spherical top-hat collapse model and that the local deviation of the expansion rate from the homogeneous one can be as high as 28% at an underdensity, for an initial density contrast of 10^{-2}. We then study, for the first time, the exact behavior of the backreaction term Q_{D}. We find that, for small values of the initial perturbations, this term exhibits a 1/a scaling, and that it is negative with a linearly growing absolute value for larger perturbation amplitudes, thereby contributing to an overall deceleration of the expansion. Its magnitude, on the other hand, remains very small even for relatively large perturbations.
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Affiliation(s)
- Eloisa Bentivegna
- Dipartimento di Fisica e Astronomia, Università degli Studi di Catania, Via Santa Sofia 64, 95123 Catania, Italy
- INFN, Sezione di Catania, Via Santa Sofia 64, 95123 Catania, Italy
| | - Marco Bruni
- Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth PO1 3FX, United Kingdom
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Mukherjee S, Souradeep T. Litmus Test for Cosmic Hemispherical Asymmetry in the Cosmic Microwave Background B-Mode Polarization. PHYSICAL REVIEW LETTERS 2016; 116:221301. [PMID: 27314711 DOI: 10.1103/physrevlett.116.221301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Indexed: 06/06/2023]
Abstract
Recent measurements of the temperature field of the cosmic microwave background (CMB) provide tantalizing evidence for violation of statistical isotropy (SI) that constitutes a fundamental tenet of contemporary cosmology. CMB space based missions, WMAP, and Planck have observed a 7% departure in the SI temperature field at large angular scales. However, due to higher cosmic variance at low multipoles, the significance of this measurement is not expected to improve from any future CMB temperature measurements. We demonstrate that weak lensing of the CMB due to scalar perturbations produces a corresponding SI violation in B modes of CMB polarization at smaller angular scales. The measurability of this phenomenon depends upon the scales (l range) over which power asymmetry is present. Power asymmetry, which is restricted only to l<64 in the temperature field, cannot lead to any significant observable effect from this new window. However, this effect can put an independent bound on the spatial range of scales of hemispherical asymmetry present in the scalar sector.
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Affiliation(s)
- Suvodip Mukherjee
- Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411007, India
| | - Tarun Souradeep
- Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411007, India
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Schlögel S, Clesse S, Füzfa A. Probing modified gravity with atom-interferometry: A numerical approach. Int J Clin Exp Med 2016. [DOI: 10.1103/physrevd.93.104036] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Zhu HM, Pen UL, Chen X, Inman D. Probing Neutrino Hierarchy and Chirality via Wakes. PHYSICAL REVIEW LETTERS 2016; 116:141301. [PMID: 27104695 DOI: 10.1103/physrevlett.116.141301] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Indexed: 06/05/2023]
Abstract
The relic neutrinos are expected to acquire a bulk relative velocity with respect to the dark matter at low redshifts, and neutrino wakes are expected to develop downstream of the dark matter halos. We propose a method of measuring the neutrino mass based on this mechanism. This neutrino wake will cause a dipole distortion of the galaxy-galaxy lensing pattern. This effect could be detected by combining upcoming lensing surveys with a low redshift galaxy survey or a 21 cm intensity mapping survey, which can map the neutrino flow field. The data obtained with LSST and Euclid should enable us to make a positive detection if the three neutrino masses are quasidegenerate with each neutrino mass of ∼0.1 eV, and a future high precision 21 cm lensing survey would allow the normal hierarchy and inverted hierarchy cases to be distinguished, and even the right-handed Dirac neutrinos may be detectable.
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Affiliation(s)
- Hong-Ming Zhu
- Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Beijing 100012, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ue-Li Pen
- Canadian Institute for Theoretical Astrophysics, 60 St. George Street, Toronto, Ontario M5S 3H8, Canada
- Canadian Institute for Advanced Research, CIFAR Program in Gravitation and Cosmology, Toronto, Ontario M5G 1Z8, Canada
| | - Xuelei Chen
- Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Beijing 100012, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Center of High Energy Physics, Peking University, Beijing 100871, China
| | - Derek Inman
- Canadian Institute for Theoretical Astrophysics, 60 St. George Street, Toronto, Ontario M5S 3H8, Canada
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Namikawa T, Nishizawa A, Taruya A. Anisotropies of Gravitational-Wave Standard Sirens as a New Cosmological Probe without Redshift Information. PHYSICAL REVIEW LETTERS 2016; 116:121302. [PMID: 27058068 DOI: 10.1103/physrevlett.116.121302] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2015] [Indexed: 06/05/2023]
Abstract
Gravitational waves (GWs) from compact binary stars at cosmological distances are promising and powerful cosmological probes, referred to as the GW standard sirens. With future GW detectors, we will be able to precisely measure source luminosity distances out to a redshift z∼5. To extract cosmological information, previously proposed cosmological studies using the GW standard sirens rely on source redshift information obtained through an extensive electromagnetic follow-up campaign. However, the redshift identification is typically time consuming and rather challenging. Here, we propose a novel method for cosmology with the GW standard sirens free from the redshift measurements. Utilizing the anisotropies of the number density and luminosity distances of compact binaries originated from the large-scale structure, we show that, once GW observations will be well established in the future, (i) these anisotropies can be measured even at very high redshifts (z≥2), where the identification of the electromagnetic counterpart is difficult, (ii) the expected constraints on the primordial non-Gaussianity with the Einstein Telescope would be comparable to or even better than the other large-scale structure probes at the same epoch, and (iii) the cross-correlation with other cosmological observations is found to have high-statistical significance, providing additional cosmological information at very high redshifts.
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Affiliation(s)
- Toshiya Namikawa
- Department of Physics, Stanford University, Stanford, California 94305, USA
- Kavli Institute for Particle Astrophysics and Cosmology, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Atsushi Nishizawa
- Theoretical Astrophysics 350-17, California Institute of Technology, Pasadena, California 91125, USA
| | - Atsushi Taruya
- Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan
- Kavli Institute for the Physics and Mathematics of the Universe, Todai Institutes for Advanced Study, the University of Tokyo, Kashiwa, Chiba 277-8583, Japan
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Leistedt B, McEwen JD, Kitching TD, Peiris HV. 3D weak lensing with spin wavelets on the ball. Int J Clin Exp Med 2015. [DOI: 10.1103/physrevd.92.123010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Alonso D, Bull P, Ferreira PG, Maartens R, Santos MG. ULTRA-LARGE-SCALE COSMOLOGY IN NEXT-GENERATION EXPERIMENTS WITH SINGLE TRACERS. ACTA ACUST UNITED AC 2015. [DOI: 10.1088/0004-637x/814/2/145] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Fonseca J, Camera S, Santos MG, Maartens R. HUNTING DOWN HORIZON-SCALE EFFECTS WITH MULTI-WAVELENGTH SURVEYS. ACTA ACUST UNITED AC 2015. [DOI: 10.1088/2041-8205/812/2/l22] [Citation(s) in RCA: 90] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Brax P, Brun P, Wouters D. Galaxy cluster constraints on the coupling to photons of low-mass scalars. Int J Clin Exp Med 2015. [DOI: 10.1103/physrevd.92.083501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Nesseris S, Sapone D. Accuracy of the growth index in the presence of dark energy perturbations. Int J Clin Exp Med 2015. [DOI: 10.1103/physrevd.92.023013] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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