Growth of cosmic perturbations in the modified $f(R,T)$ gravity
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arXiv
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866910671875080192 |
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| author | Asghari, Mahnaz Sheykhi, Ahmad |
| author_facet | Asghari, Mahnaz Sheykhi, Ahmad |
| contents | We explore the generalized $f(R,T)$ modified theory of gravity, where the gravitational Lagrangian is a function of Ricci scalar $R$ and the trace of the energy-momentum tensor $T$. We derive modified field equations to the linear order of perturbations in the context of $f(R,T)$ model. We then investigate the growth of perturbations in the context of $f(R,T)$ modified gravity. Primary numerical investigations based on matter power spectra diagrams indicate a structure growth suppression in $f(R,T)$ gravity, which exhibits consistency with local measurements. Also, we notice that matter-geometry interaction in $f(R,T)$ model would results in the specific feature named as "matter acoustic oscillations" appeared in matter power spectra diagrams. Moreover, we put constraints on the cosmological parameters of $f(R,T)$ model, utilizing current observations, chiefly cosmic microwave background (CMB), weak lensing, supernovae, baryon acoustic oscillations, and redshift-space distortions data. Numerical results based on MCMC calculations imply that $f(R,T)$ is a qualified theory of modified gravity in reconciling Planck CMB data with local probes of large scale structures, by reporting lower values for the structure growth parameter $σ_8$ compared to the standard model of cosmology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_11840 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Growth of cosmic perturbations in the modified $f(R,T)$ gravity Asghari, Mahnaz Sheykhi, Ahmad General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics High Energy Physics - Theory We explore the generalized $f(R,T)$ modified theory of gravity, where the gravitational Lagrangian is a function of Ricci scalar $R$ and the trace of the energy-momentum tensor $T$. We derive modified field equations to the linear order of perturbations in the context of $f(R,T)$ model. We then investigate the growth of perturbations in the context of $f(R,T)$ modified gravity. Primary numerical investigations based on matter power spectra diagrams indicate a structure growth suppression in $f(R,T)$ gravity, which exhibits consistency with local measurements. Also, we notice that matter-geometry interaction in $f(R,T)$ model would results in the specific feature named as "matter acoustic oscillations" appeared in matter power spectra diagrams. Moreover, we put constraints on the cosmological parameters of $f(R,T)$ model, utilizing current observations, chiefly cosmic microwave background (CMB), weak lensing, supernovae, baryon acoustic oscillations, and redshift-space distortions data. Numerical results based on MCMC calculations imply that $f(R,T)$ is a qualified theory of modified gravity in reconciling Planck CMB data with local probes of large scale structures, by reporting lower values for the structure growth parameter $σ_8$ compared to the standard model of cosmology. |
| title | Growth of cosmic perturbations in the modified $f(R,T)$ gravity |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics High Energy Physics - Theory |
| url | https://arxiv.org/abs/2405.11840 |