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Dark energy survivals in massive gravity after GW170817: SO(3) invariant
Lavinia Heisenberg, Shinji Tsujikawa
The recent detection of the gravitational wave signal GW170817 together with an electromagnetic counterpart GRB 170817A from the merger of two neutron stars puts a stringent bound…
Relativistic stars in vector-tensor theories
Ryotaro Kase, Masato Minamitsuji, Shinji Tsujikawa
We study relativistic star solutions in second-order generalized Proca theories characterized by a -breaking vector field with derivative couplings. In the models with cubic…
Observational signatures of the parametric amplification of gravitational waves during reheating after inflation
Sachiko Kuroyanagi, Chunshan Lin, Misao Sasaki +1
We study the evolution of Gravitational Waves (GWs) during and after inflation as well as the resulting observational consequences in a Lorentz-violating massive gravity theory wit…
Suppression of matter couplings with a vector field in generalized Proca theories
Shintaro Nakamura, Ryotaro Kase, Shinji Tsujikawa
We derive the profile of a vector field coupled to matter on a static and spherically symmetric background in the context of generalized Proca theories. The cubic Galileon self-int…
Black holes in vector-tensor theories
Lavinia Heisenberg, Ryotaro Kase, Masato Minamitsuji +1
We study static and spherically symmetric black hole (BH) solutions in second-order generalized Proca theories with nonminimal vector field derivative couplings to the Ricci scalar…
Hairy black-hole solutions in generalized Proca theories
Lavinia Heisenberg, Ryotaro Kase, Masato Minamitsuji +1
We present a family of exact black-hole solutions on a static spherically symmetric background in second-order generalized Proca theories with derivative vector-field interactions…