Observational constraints on Yukawa cosmology and connection with black hole shadows

Abstract

We confront Yukawa modified cosmology, proposed in arXiv:2304.11492 [Jusufi et al. arXiv:2304.11492], with data from Supernovae Type Ia (SNe Ia) and Hubble parameter (OHD) observations. Yukawa cosmology is obtained from a Yukawa-like gravitational potential, with coupling parameter $\alpha$ and wavelength parameter $\lambda$, which gives rise to modified Friedmann equations. We show that the agreement with observations is very efficient, and within $1\sigma$ confidence level we find the best-fit parameters $\lambda =\left(2693_{-1262}^{+1191}\right)\mathrm{Mpc}$, $\alpha =0.416_{-0.326}^{+1.137}$, and a graviton mass of $m_g=\left(2.374_{-0.728}^{+2.095}\right)\times 10^{-42}\text{GeV}$. Additionally, we establish a connection between the effective dark matter and dark energy density parameters and the angular radius of the black hole shadow of the SgrA and M87 black holes in the low-redshift limit, consistent with the Event Horizon Telescope findings.

13 pages, 5 figures. Minor changes

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