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Invertible disformal transformations with higher derivatives
Kazufumi Takahashi, Hayato Motohashi, Masato Minamitsuji
We consider a higher-derivative generalization of disformal transformations in -dimensional spacetime and clarify the conditions under which they form a group with respect to th…
Spontaneous scalarization of charged stars
Masato Minamitsuji, Shinji Tsujikawa
We study static and spherically symmetric charged stars with a nontrivial profile of the scalar field in Einstein-Maxwell-scalar theories. The scalar field is coupled to a $U(1…
Black holes in the quadratic-order extended vector-tensor theories
Masato Minamitsuji
We investigate the static and spherically black hole solutions in the quadratic-order extended vector-tensor theories without suffering from the Ostrogradsky instabilities, which i…
Generalized disformal invariance of cosmological perturbations with second-order field derivatives
Masato Minamitsuji
We investigate how the comoving curvature and tensor perturbations are transformed under the generalized disformal transformation with the second-order covariant derivatives of the…
Disformal transformation of physical quantities associated with relativistic stars
Masato Minamitsuji
We investigate how physical quantities associated with relativistic stars in the Jordan and Einstein frames are related by the generalized disformal transformations constructed by…