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Disformal transformation of stationary and axisymmetric solutions in modified gravity
Masato Minamitsuji
The extended scalar-tensor and vector-tensor theories admit black hole solutions with the nontrivial profiles of the scalar and vector fields, respectively. The disformal transform…
Spontaneous scalarization of a conducting sphere in Maxwell-scalar models
Carlos A. R. Herdeiro, Taishi Ikeda, Masato Minamitsuji +2
We study the spontaneous scalarization of a standard conducting charged sphere embedded in Maxwell-scalar models in flat spacetime, wherein the scalar field is nonminimally cou…
Stealth spontaneous spinorization of relativistic stars
Masato Minamitsuji
We investigate the behavior of the Dirac spinor fields in general relativistic high density stellar backgrounds and the possibility of spontaneous spinorization which is analogous…
Spontaneous vectorization in the presence of vector field coupling to matter
Masato Minamitsuji
We examine the possibility of spontaneous vectorization in the vector-tensor theories with the vector conformal and disformal couplings to matter. We study the static and spherical…
Neutron stars with a generalized Proca hair and spontaneous vectorization
Ryotaro Kase, Masato Minamitsuji, Shinji Tsujikawa
In a class of generalized Proca theories, we study the existence of neutron star solutions with a nonvanishing temporal component of the vector field approaching 0 toward spa…