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Big Bang Nucleosynthesis constraints on the Energy-Momentum Squared Gravity: The $\mathbb{T}^{2}$ model
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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 on nuclear abundances are being used to put bounds on this class of modified gravity models. Using the tight constraint from BBN on the correction term in the Friedmann equation in EMSG scenario, we report the allowed deviation from the standard cosmic expansion rate.
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Baryon asymmetry from higher-order matter contributions in gravity
A T^2-dependent coupling between the derivative of T_mu nu T^mu nu and the baryon current can generate the observed baryon asymmetry in GR and f(R,T^2) gravity, at the cost of fitted parameters.
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