Big Bang Nucleosynthesis constraints on the Energy-Momentum Squared Gravity: The 𝕋^2 model
arxiv(2024)
摘要
A scale-independent energy-momentum squared gravity (EMSG) allows different
gravitational couplings for different types of sources and has been proven to
have interesting implications in cosmology. In this paper, the Big Bang
Nucleosynthesis (BBN) formalism and the latest observational constraints are
being used in order to extract constraints on this class of modified gravity
models. The model has been constrained using the light element reaction rates.
Using the tight constraint from BBN on the correction term in the Friedman
equation due to EMSG, we find a significant deviation in the matter power
spectrum of the cosmic microwave background (CMB) even for a very small allowed
value of the modification parameter, thus pointing out the sensitivity of the
matter power spectrum at the small scales.
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