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Yang Y, Ren X, Wang Q, Lu Z, Zhang D, Cai YF, Saridakis EN. Quintom cosmology and modified gravity after DESI 2024. Sci Bull (Beijing) 2024; 69:2698-2704. [PMID: 39122617 DOI: 10.1016/j.scib.2024.07.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2024] [Revised: 07/06/2024] [Accepted: 07/12/2024] [Indexed: 08/12/2024]
Abstract
We reconstruct the cosmological background evolution under the scenario of dynamical dark energy through the Gaussian process approach, using the latest Dark Energy Spectroscopic Instrument (DESI) baryon acoustic oscillations (BAO) combined with other observations. Our results reveal that the reconstructed dark-energy equation-of-state (EoS) parameter w(z) exhibits the so-called quintom-B behavior, crossing -1 from phantom to quintessence regime as the universe expands. We investigate under what situation this type of evolution could be achieved from the perspectives of field theories and modified gravity. In particular, we reconstruct the corresponding actions for f(R),f(T), and f(Q) gravity, respectively. We explicitly show that, certain modified gravity can exhibit the quintom dynamics and fit the recent DESI data efficiently, and for all cases the quadratic deviation from the ΛCDM scenario is mildly favored.
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Affiliation(s)
- Yuhang Yang
- Department of Astronomy, School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China; CAS Key Laboratory for Researches in Galaxies and Cosmology, School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, China; Deep Space Exploration Laboratory, Hefei 230088, China
| | - Xin Ren
- Department of Astronomy, School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China; CAS Key Laboratory for Researches in Galaxies and Cosmology, School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, China; Deep Space Exploration Laboratory, Hefei 230088, China; Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan
| | - Qingqing Wang
- Department of Astronomy, School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China; CAS Key Laboratory for Researches in Galaxies and Cosmology, School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, China; Deep Space Exploration Laboratory, Hefei 230088, China
| | - Zhiyu Lu
- Department of Astronomy, School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China; CAS Key Laboratory for Researches in Galaxies and Cosmology, School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, China; Deep Space Exploration Laboratory, Hefei 230088, China
| | - Dongdong Zhang
- Department of Astronomy, School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China; CAS Key Laboratory for Researches in Galaxies and Cosmology, School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, China; Deep Space Exploration Laboratory, Hefei 230088, China; Kavli IPMU (WPI), UTIAS, The University of Tokyo, Chiba 277-8583, Japan
| | - Yi-Fu Cai
- Department of Astronomy, School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China; CAS Key Laboratory for Researches in Galaxies and Cosmology, School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, China; Deep Space Exploration Laboratory, Hefei 230088, China.
| | - Emmanuel N Saridakis
- National Observatory of Athens, Lofos Nymfon 11852, Greece; CAS Key Laboratory for Researches in Galaxies and Cosmology, School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, China; Departamento de Matemáticas, Universidad Católica del Norte, Antofagasta 1270398, Chile.
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