

|
|
基本情報 |
|
氏名 |
山内 大介 |
氏名(カナ) |
ヤマウチ ダイスケ |
氏名(英語) |
Yamauchi Daisuke |
所属 |
理学部 物理学科 |
職名 |
講師 |
researchmap研究者コード |
B000327615 |
researchmap機関 |
岡山理科大学 |
Modified gravity inside astrophysical bodies
Ryo Saito, Daisuke Yamauchi, Shuntaro Mizuno, Jerome Gleyzes, David Langlois
Many theories of modified gravity, including the well studied Horndeski models, are characterized by a screening mechanism that ensures that standard gravity is recovered near astrophysical bodies. In a recently introduced class of gravitational theories that goes beyond Horndeski, it has been found that new derivative interactions lead to a partial breaking of the Vainshtein screening mechanism inside any gravitational source, although not outside. We study the impact of this new type of deviation from standard gravity on the density profile of a spherically symmetric matter distribution, in the nonrelativistic limit. For simplicity, we consider a polytropic equation of state and derive the modifications to the standard Lane-Emden equations. We also show the existence of a universal upper bound on the amplitude of this type of modified gravity, independently of the details of the equation of state.
Journal of Cosmology and Astroparticle Physics
10.1088/1475-7516/2015/06/008
|