Effective field theory of broken spatial diffeomorphisms

Bibliographic description

punktacja MNiSW [2016 A]: 40

title:	Effective field theory of broken spatial diffeomorphisms
author:	Lin Chunshan , Labun Lance Z.
journal title:	The Journal of High Energy Physics
volume:	2016
issue:	3
date of publication :	2016
article ID:	128
ISSN:	1126-6708
eISSN:	1029-8479
DOI:	10.1007/JHEP03(2016)128
language:	English
journal language:	English
abstract in English:	We study the low energy effective theory describing gravity with broken spatial diffeomorphism invariance. In the unitary gauge, the Goldstone bosons associated with broken diffeomorphisms are eaten and the graviton becomes a massive spin-2 particle with 5 well-behaved degrees of freedom. In this gauge, the most general theory is built with the lowest dimension operators invariant under only temporal diffeomorphisms. Imposing the additional shift and SO(3) internal symmetries, we analyze the perturbations on a FRW background. At linear perturbation level, the observables of this theory are characterized by five parameters, including the usual cosmological parameters and one additional coupling constant for the symmetry-breaking scalars. In the de Sitter and Minkowski limit, the three Goldstone bosons are supermassive and can be integrated out, leaving two massive tensor modes as the only propagating degrees of freedom. We discuss several examples relevant to theories of massive gravity.
affiliation:	Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki Teoretycznej
type:	journal article
subtype:	academic paper