Cosmological perturbations in the energy-momentum squared gravity theory:constraints from gravitational wave standard sirens and redshift space distortions  

作　　者：Qi-Ming Fu Xin Zhang 付启铭;张鑫

机构地区：[1]Institute of Physics,Shaanxi University of Technology,Hanzhong 723000,China [2]Lanzhou Center for Theoretical Physics,Key Laboratory of Theoretical Physics of Gansu Province,and Key Laboratory of Quantum Theory and Applications of MoE,Lanzhou University,Lanzhou 730000,China [3]Key Laboratory of Cosmology and Astrophysics(Liaoning)&College of Sciences,Northeastern University,Shenyang 110819,China [4]Key Laboratory of Data Analytics and Optimization for Smart Industry(Ministry of Education),Northeastern University,Shenyang 110819,China [5]National Frontiers Science Center for Industrial Intelligence and Systems Optimization,Northeastern University,Shenyang 110819,China

出　　处：《Chinese Physics C》2025年第4期199-208,共10页中国物理C(英文版)

基　　金：Supported by the National SKA Program of China(2022SKA0110200,2022SKA0110203);the National Natural Science Foundation of China(12473001,11975072,12247101);the National 111 Project(B16009)。

摘　　要：We investigate the linear cosmological perturbations in the context of the so-called energy-momentum squared gravity(EMSG)theory.Recent research shows that the EMSG theory can reproduce a viable background cosmological evolution comparable toΛCDM,whereas the matter-dominated era exhibits slight distinctions.In this paper,we focus on power-law EMSG models and derive the equations for the linear cosmological perturbations.We explore the propagation of the gravitational wave(GW)and the growth of matter density perturbation at the first order,and we estimate the model parameters from the simulated GW and observed redshift space distortion data.Our analysis reveals that the model parameters should be small and positive in the confidence interval,which indicates that the theory agrees closely with the observational data and can be considered an alternative to the standard cosmological model.

关 键 词：energy-momentum squared gravity cosmological perturbations gravitational wave cosmological parameters 

分 类 号：P159[天文地球—天文学]