Relativistic stars in vector-tensor theories

Ryotaro Kase, Masato Minamitsuji, Shinji Tsujikawa

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


We study relativistic star solutions in second-order generalized Proca theories characterized by a U(1)-breaking vector field with derivative couplings. In the models with cubic and quartic derivative coupling, the mass and radius of stars become larger than those in general relativity for negative derivative coupling constants. This phenomenon is mostly attributed to the increase of star radius induced by a slower decrease of the matter pressure compared to general relativity. There is a tendency that the relativistic star with a smaller mass is not gravitationally bound for a low central density and hence is dynamically unstable, but that with a larger mass is gravitationally bound. On the other hand, we show that the intrinsic vector-mode couplings give rise to general relativistic solutions with a trivial field profile, so the mass and radius are not modified from those in general relativity.

Original languageEnglish
Article number084009
JournalPhysical Review D
Issue number8
Publication statusPublished - 2018 Apr 9
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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