Minimally Modified Gravity fitting Planck data better than $\Lambda$CDM

Autor:	Aoki, Katsuki, De Felice, Antonio, Mukohyama, Shinji, Noui, Karim, Oliosi, Michele, Pookkillath, Masroor C.
Rok vydání:	2020
Předmět:	Astrophysics - Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Theory
Zdroj:	Eur. Phys. J. C 80, 708 (2020)
Druh dokumentu:	Working Paper
DOI:	10.1140/epjc/s10052-020-8291-1
Popis:	We study the phenomenology of a class of minimally modified gravity theories called $f(\mathcal{H})$ theories, in which the usual general relativistic Hamiltonian constraint is replaced by a free function of it. After reviewing the construction of the theory and a consistent matter coupling, we analyze the dynamics of cosmology at the levels of both background and perturbations, and present a concrete example of the theory with a $3$-parameter family of the function $f$. Finally, we compare this example model to Planck data as well as some later-time probes, showing that such a realization of $f(\mathcal{H})$ theories fits the data significantly better than the standard $\Lambda$CDM model, in particular by modifying gravity at intermediate redshifts, $z\simeq743$. Comment: 21 pages, 10 figures, matches with published version
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2005.13972 Zobrazit plný text záznamu View this record from Arxiv