A no-hair theorem for stars in Horndeski theories

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Published 20 July 2017 © 2017 IOP Publishing Ltd and Sissa Medialab
, , Citation A. Lehébel et al JCAP07(2017)037 DOI 10.1088/1475-7516/2017/07/037

1475-7516/2017/07/037

Abstract

We consider a generic scalar-tensor theory involving a shift-symmetric scalar field and minimally coupled matter fields. We prove that the Noether current associated with shift-symmetry vanishes in regular, spherically symmetric and static spacetimes. We use this fact to prove the absence of scalar hair for spherically symmetric and static stars in Horndeski and beyond theories. We carefully detail the validity of this no-hair theorem.

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10.1088/1475-7516/2017/07/037