Testing gravity with halo density profiles observed through gravitational lensing

Tatsuya Narikawa, Kazuhiro Yamamoto

研究成果: Contribution to journalArticle査読

12 被引用数 (Scopus)

抄録

We present a new test of the modified gravity endowed with the Vainshtein mechanism with the density profile of a galaxy cluster halo observed through gravitational lensing. A scalar degree of freedom in the galileon modified gravity is screened by the Vainshtein mechanism to recover Newtonian gravity in high-density regions, however it might not be completely hidden on the outer side of a cluster of galaxies. Then the modified gravity might yield an observational signature in a surface mass density of a cluster of galaxies measured through gravitational lensing, since the scalar field could contribute to the lensing potential. We investigate how the transition in the Vainshtein mechanism affects the surface mass density observed through gravitational lensing, assuming that the density profile of a cluster of galaxies follows the original Navarro-Frenk-White (NFW) profile, the generalized NFW profile and the Einasto profile. We compare the theoretical predictions with observational results of the surface mass density reported recently by other researchers. We obtain constraints on the amplitude and the typical scale of the transition in the Vainshtein mechanism in a subclass of the generalized galileon model.

本文言語英語
論文番号016
ジャーナルJournal of Cosmology and Astroparticle Physics
2012
5
DOI
出版ステータス出版済み - 5 2012
外部発表はい

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics

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