1. Minimally Modified Gravity fitting Planck data better than $��$CDM
- Author
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Aoki, Katsuki, De Felice, Antonio, Mukohyama, Shinji, Noui, Karim, Oliosi, Michele, and Pookkillath, Masroor C.
- Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,High Energy Physics - Theory (hep-th) ,FOS: Physical sciences ,General Relativity and Quantum Cosmology (gr-qc) - Abstract
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 $��$CDM model, in particular by modifying gravity at intermediate redshifts, $z\simeq743$., 21 pages, 10 figures, matches with published version
- Published
- 2020
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