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Highly compact Proca stars with quartic self-interactions
Katsuki Aoki, Masato Minamitsuji
We study self-gravitating bound states of a complex vector field, known as Proca stars, with a new type of quartic-order self-interaction which does not exist in the case of either…
Generalized disformal Horndeski theories: cosmological perturbations and consistent matter coupling
Kazufumi Takahashi, Masato Minamitsuji, Hayato Motohashi
Invertible disformal transformations are a useful tool to investigate ghost-free scalar-tensor theories. By performing a higher-derivative generalization of the invertible disforma…
Symmetry restoration in the vicinity of neutron stars with a nonminimal coupling
Masato Minamitsuji, Shinji Tsujikawa
We propose a new model of scalarized neutron stars (NSs) realized by a self-interacting scalar field nonminimally coupled to the Ricci scalar of the form . The scala…
Stability of neutron stars in Horndeski theories with Gauss-Bonnet couplings
Masato Minamitsuji, Shinji Tsujikawa
In Horndeski theories containing a scalar coupling with the Gauss-Bonnet (GB) curvature invariant , we study the existence and linear stability of neutron star (NS) s…
Resolving the pathologies of self-interacting Proca fields: A case study of Proca stars
Katsuki Aoki, Masato Minamitsuji
It has been argued that a self-interacting massive vector field is pathological due to a dynamical formation of a singular effective metric of the vector field, which is the onset…
Static and spherically symmetric general relativity solutions in Minimal Theory of Bigravity
Masato Minamitsuji, Antonio De Felice, Shinji Mukohyama +1
We investigate static and spherically symmetric solutions in the Minimal Theory of Bigravity (MTBG). First, we show that a pair of Schwarzschild-de Sitter spacetimes with different…