Počet záznamů: 1
Nonstandard gravitational waves imply gravitational slip: on the difficulty of partially hiding new gravitational degrees of freedom
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SYSNO ASEP 0487949 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Nonstandard gravitational waves imply gravitational slip: on the difficulty of partially hiding new gravitational degrees of freedom Tvůrce(i) Sawicki, Ignacy (FZU-D) ORCID
Saltas, I.D. (PT)
Motta, M. (CH)
Amendola, L. (CH)
Kunz, M. (CH)Celkový počet autorů 5 Číslo článku 083520 Zdroj.dok. Physical Review D. - : American Physical Society - ISSN 2470-0010
Roč. 95, č. 8 (2017), s. 1-16Poč.str. 16 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova modified gravity ; gravitational waves ; cosmology ; large scale structure Vědní obor RIV BN - Astronomie a nebeská mechanika, astrofyzika Obor OECD Astronomy (including astrophysics,space science) CEP EF15_003/0000437 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora FZU-D - RVO:68378271 UT WOS 000400143500001 EID SCOPUS 85021690744 DOI 10.1103/PhysRevD.95.083520 Anotace 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. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2018
Počet záznamů: 1