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Nonstandard gravitational waves imply gravitational slip: on the difficulty of partially hiding new gravitational degrees of freedom
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SYSNO ASEP 0487949 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Nonstandard gravitational waves imply gravitational slip: on the difficulty of partially hiding new gravitational degrees of freedom Author(s) Sawicki, Ignacy (FZU-D) ORCID
Saltas, I.D. (PT)
Motta, M. (CH)
Amendola, L. (CH)
Kunz, M. (CH)Number of authors 5 Article number 083520 Source Title Physical Review D. - : American Physical Society - ISSN 2470-0010
Roč. 95, č. 8 (2017), s. 1-16Number of pages 16 s. Language eng - English Country US - United States Keywords modified gravity ; gravitational waves ; cosmology ; large scale structure Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics OECD category Astronomy (including astrophysics,space science) R&D Projects EF15_003/0000437 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support FZU-D - RVO:68378271 UT WOS 000400143500001 EID SCOPUS 85021690744 DOI 10.1103/PhysRevD.95.083520 Annotation In many generalized models of gravity, perfect fluids in cosmology give rise to gravitational slip. Simultaneously, in very broad classes of such models, the propagation of gravitational waves is altered. We investigate the extent to which there is a one-to-one relationship between these two properties in three classes of models with one extra degree of freedom: scalar (Horndeski and beyond), vector (Einstein-aether), and tensor (bimetric). We prove that in bimetric gravity and Einstein-aether, it is impossible to dynamically hide the gravitational slip on all scales whenever the propagation of gravitational waves is modified. Horndeski models are much more flexible, but it is nonetheless only possible to hide gravitational slip dynamically when the action for perturbations is tuned to evolve in time toward a divergent kinetic term. These results provide an explicit, theoretical argument for the interpretation of future observations if they disfavored the presence of gravitational slip. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2018
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