Quintom cosmology and modified gravity after DESI 2024  

暗能量光谱巡天2024数据驱动下的精灵宇宙学与引力理论研究

作　　者：Yuhang Yang Xin Ren Qingqing Wang Zhiyu Lu Dongdong Zhang Yi-Fu Cai Emmanuel N.Saridakis 杨宇杭;任鑫;王晴睛;陆志字;张东东;蔡一夫;Emmanuel N.Saridakis

机构地区：[1]Department of Astronomy,School of Physical Sciences,University of Science and Technology of China,Hefei 230026,China [2]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 [3]Deep Space Exploration Laboratory,Hefei 230088,China [4]Department of Physics,Tokyo Institute of Technology,Tokyo 152-8551,Japan [5]Kavli IPMU(WPI),UTIAS,The University of Tokyo,Chiba 277-8583,Japan [6]National Observatory of Athens,Lofos Nymfon 11852,Greece [7]Departamento de Matemáticas,Universidad Católica del Norte,Antofagasta 1270398,Chile

出　　处：《Science Bulletin》2024年第17期2698-2704,共7页科学通报（英文版）

基　　金：National Key Research and Development Program of China(2021YFC2203100);National Natural Science Foundation of China(12261131497 and 12003029);CAS young interdisciplinary innovation team(JCTD2022-20);111 Project(B23042);USTC Fellowship for International Cooperation,and USTC Research Funds of the Double First-Class Initiative。

摘　　要：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 theΛCDM scenario is mildly favored.

关 键 词：DESI Dark energy Quintom cosmology Modified gravity 

分 类 号：P111[天文地球—天文学] P159