2018年3月15日
Scalar-tensor theories and modified gravity in the wake of GW170817
Physical Review D
- ,
- ,
- ,
- 巻
- 97
- 号
- 6
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevD.97.061501, 10.48550/arXiv.1711.07403
- 出版者・発行元
- American Physical Society
Theories of dark energy and modified gravity can be strongly constrained by astrophysical or cosmological observations, as illustrated by the recent observation of the gravitational wave event GW170817 and of its electromagnetic counterpart GRB 170817A, which showed that the speed of gravitational waves, cg, is the same as the speed of light, within deviations of order 10-15. This observation implies severe restrictions on scalar-tensor theories, in particular theories whose action depends on second derivatives of a scalar field. Working in the very general framework of degenerate higher-order scalar-tensor (DHOST) theories, which encompass Horndeski and beyond Horndeski theories, we present the DHOST theories that satisfy cg=c. We then examine, for these theories, the screening mechanism that suppresses scalar interactions on small scales, namely the Vainshtein mechanism, and compute the corresponding gravitational laws for a nonrelativistic spherical body. We show that it can lead to a deviation from standard gravity inside matter, parametrized by three coefficients which satisfy a consistency relation and can be constrained by present and future astrophysical observations.
- リンク情報
-
- DOI
- https://doi.org/10.1103/PhysRevD.97.061501
- DOI
- https://doi.org/10.48550/arXiv.1711.07403 本文へのリンクあり
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000428241300001&DestApp=WOS_CPL
- 共同研究・競争的資金等の研究課題
- 第5の力を通した重力理論の検証
- ID情報
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- DOI : 10.1103/PhysRevD.97.061501
- DOI : 10.48550/arXiv.1711.07403
- ISSN : 2470-0029
- ISSN : 2470-0010
- SCOPUS ID : 85044817269
- Web of Science ID : WOS:000428241300001