Quintom cosmology and modified gravity after DESI 2024

Yuhang Yang ¹Xin Ren ²Qingqing Wang ¹Zhiyu Lu ¹Dongdong Zhang ³Yi-Fu Cai ¹Emmanuel N.Saridakis⁴

扫码查看

作者信息

1. 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
2. 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
3. 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
4. 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
折叠

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)bar-yon acoustic oscillations(BAO)combined with other observations.Our results reveal that the recon-structed 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 sit-uation this type of evolution could be achieved from the perspectives of field theories and modified gravity.In particular,we reconstruct the corresponding actions forf(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 ACDM scenario is mildly favored.

Key words

DESI/Dark energy/Quintom cosmology/Modified gravity

引用本文复制引用

基金项目

National Key Research and Development Program of China(2021YFC2203100)

National Natural Science Foundation of China(12261131497)

National Natural Science Foundation of China(12003029)

CAS young interdisciplinary innovation team(JCTD-2022-20)

111 Project(B23042)

USTC Fellowship for International Cooperation()

USTC Research Funds of the Double First-Class Initiative()

LISA CosWG()

COST Actions(CA18108)

&&(CA21136)

World Premier International Research Center Initiative(WPI),MEXT,Japan()

出版年

2024

科学通报(英文版)

中国科学院

科学通报(英文版)

CSTPCD

ISSN：1001-6538

段落导航