2026-04-14T02:30:56Zhttps://recercat.cat/oai/requestoai:recercat.cat:2117/1308992026-01-22T05:20:45Zcom_2072_1033col_2072_452950
RECERCAT
author
Haro Cases, Jaume
author
Amorós Torrent, Jaume
2018-03-15
We consider the Arnowitt-Deser-Misner formalism as a tool to build bouncing cosmologies. In this approach, the foliation of the spacetime has to be fixed in order to go beyond general relativity modifying the gravitational sector. Once a preferred slicing, which we choose based on the matter content of the Universe following the spirit of Weyl’s postulate, has been fixed, f theories depending on the extrinsic and intrinsic curvature of the slicing are covariant for all the reference frames preserving the foliation; i.e., the constraint and dynamical equations have the same form for all these observers. Moreover, choosing multivalued f functions, bouncing backgrounds emerge in a natural way. In fact, the simplest is the one corresponding to holonomy corrected loop quantum cosmology. The final goal of this work is to provide the equations of perturbations which, unlike the full equations, become gauge invariant in this theory, and apply them to the so-called matter bounce scenario.Peer ReviewedPostprint (author's final draft)
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ Open Access Attribution-NonCommercial-NoDerivs 3.0 Spain
Àrees temàtiques de la UPC::Matemàtiques i estadística
Cosmology
Relativity (Physics)
Cosmologia
Relativitat (Física)
Bouncing cosmologies via modified gravity in the ADM formalism: Application to loop quantum cosmology
Article