Big bang nucleosynthesis constraints on the energy-momentum squared gravity: The T2 model
Jang D. Gangopadhyay M.R. Cheoun M.-K. Kajino T. Sami M.
15 February 2025American Physical Society
Physical Review D
2025#111Issue 4
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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School of Physics, Peng Huanwu Collaborative Center for Research and Education, International Research Center for Big-Bang Cosmology and Element Genesis, Beihang University, Beijing, 100191, China
Centre for Cosmology and Science Popularization (CCSP), SGT University, Delhi- NCR, Haryana, Gurugram, 122505, India
Department of Physics and OMEG Institute, Soongsil University, Seoul, 156-743, South Korea
The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan
Center for Theoretical Physics, Eurasian National University, Astana, 010008, Kazakhstan
Chinese Academy of Sciences, 52 Sanlihe Road, Xicheng District, Beijing, China
School of Physics
Centre for Cosmology and Science Popularization (CCSP)
Department of Physics and OMEG Institute
The University of Tokyo
National Astronomical Observatory of Japan
Center for Theoretical Physics
Chinese Academy of Sciences
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