KFU. Card publication. Anisotropy screening in Horndeski cosmologies

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FEDERAL UNIVERSITY

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ANISOTROPY SCREENING IN HORNDESKI COSMOLOGIES

Form of presentation

Articles in international journals and collections

Year of publication

2020

Язык

английский

Authors, employees of KFU

Sushkov Sergey Vladimirovich, author

Bibliographic description in the original language

Starobinsky A.A. Anisotropy screening in Horndeski cosmologies / A.A. Starobinsky, S.V. Sushkov, M.S. Volkov // Physical Review D. - 2020. - Vol. 101. - 064039.

Annotation

We consider anisotropic cosmologies in a particular shift-symmetric Horndeski theory containing the Gμν∂μϕ∂νϕ coupling, where Gμν is the Einstein tensor. This theory admits stable in the future self-accelerating cosmologies whose tensor perturbations propagate with the velocity very close to the speed of light such that the theory agrees with the gravity wave observations. Surprisingly, we find that the anisotropies within the Bianchi I homogeneous spacetime model are screened at early time by the scalar charge, whereas at late times they are damped in the usual way, hence they are damped at all times. Therefore, contrary to what one would normally expect, the initial state of the universe close to the singularity cannot be anisotropic, although it seems it should be inhomogeneous. At the same time, we find that in the Bianchi IX case the universe can be strongly anisotropic close to the initial singularity even in the presence of a scalar charge.

Keywords

anisotropic cosmology, Horndeski theory of gravity

The name of the journal

PHYSICAL REVIEW D

URL

https://journals.aps.org/prd/abstract/10.1103/PhysRevD.101.064039

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=234570&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Sushkov Sergey Vladimirovich	ru_RU
dc.date.accessioned	2020-01-01T00:00:00Z	ru_RU
dc.date.available	2020-01-01T00:00:00Z	ru_RU
dc.date.issued	2020	ru_RU
dc.identifier.citation	Starobinsky A.A. Anisotropy screening in Horndeski cosmologies / A.A. Starobinsky, S.V. Sushkov, M.S. Volkov // Physical Review D. - 2020. - Vol. 101. - 064039.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=234570&p_lang=2	ru_RU
dc.description.abstract	PHYSICAL REVIEW D	ru_RU
dc.description.abstract	We consider anisotropic cosmologies in a particular shift-symmetric Horndeski theory containing the Gμν∂μϕ∂νϕ coupling, where Gμν is the Einstein tensor. This theory admits stable in the future self-accelerating cosmologies whose tensor perturbations propagate with the velocity very close to the speed of light such that the theory agrees with the gravity wave observations. Surprisingly, we find that the anisotropies within the Bianchi I homogeneous spacetime model are screened at early time by the scalar charge, whereas at late times they are damped in the usual way, hence they are damped at all times. Therefore, contrary to what one would normally expect, the initial state of the universe close to the singularity cannot be anisotropic, although it seems it should be inhomogeneous. At the same time, we find that in the Bianchi IX case the universe can be strongly anisotropic close to the initial singularity even in the presence of a scalar charge.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	anisotropic cosmology	ru_RU
dc.subject	Horndeski theory of gravity	ru_RU
dc.title	Anisotropy screening in Horndeski cosmologies	ru_RU
dc.type	Articles in international journals and collections	ru_RU