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Quintom cosmology and modified gravity after DESI 2024.
Yang, Yuhang; Ren, Xin; Wang, Qingqing; Lu, Zhiyu; Zhang, Dongdong; Cai, Yi-Fu; Saridakis, Emmanuel N.
Affiliation
  • Yang Y; 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
  • Ren X; 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
  • Wang Q; 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
  • Lu Z; 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
  • Zhang D; 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
  • Cai YF; 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
  • Saridakis EN; 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, Avda. Angam
Sci Bull (Beijing) ; 2024 Jul 17.
Article in En | MEDLINE | ID: mdl-39122617
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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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Sci Bull (Beijing) Year: 2024 Document type: Article
Fulltext
Add to My VHL
Print
XML
PubMed Links
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Sci Bull (Beijing) Year: 2024 Document type: Article