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Peirone S, Benevento G, Frusciante N, Tsujikawa S. Cosmological data favor Galileon ghost condensate over
ΛCDM. Int J Clin Exp Med 2019. [DOI: 10.1103/physrevd.100.063540] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Tsujikawa S. Lunar laser ranging constraints on nonminimally coupled dark energy and standard sirens. Int J Clin Exp Med 2019. [DOI: 10.1103/physrevd.100.043510] [Citation(s) in RCA: 10] [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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The Lanczos Equation on Light-Like Hypersurfaces in a Cosmologically Viable Class of Kinetic Gravity Braiding Theories. Symmetry (Basel) 2019. [DOI: 10.3390/sym11050616] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
We discuss junction conditions across null hypersurfaces in a class of scalar–tensor gravity theories (i) with second-order dynamics, (ii) obeying the recent constraints imposed by gravitational wave propagation, and (iii) allowing for a cosmologically viable evolution. These requirements select kinetic gravity braiding models with linear kinetic term dependence and scalar field-dependent coupling to curvature. We explore a pseudo-orthonormal tetrad and its allowed gauge fixing with one null vector standing as the normal and the other being transversal to the hypersurface. We derive a generalization of the Lanczos equation in a 2 + 1 decomposed form, relating the energy density, current, and isotropic pressure of a distributional source to the jumps in the transverse curvature and transverse derivative of the scalar. Additionally, we discuss a scalar junction condition and its implications for the distributional source.
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Nakamura S, Kase R, Tsujikawa S. Suppression of matter couplings with a vector field in generalized Proca theories. Int J Clin Exp Med 2017. [DOI: 10.1103/physrevd.96.084005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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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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