96 citations · 1.2k across the 37 of their papers we have counts for
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Ghost-free resummation of gravitational interactions of a 2-form gauge field
Kazufumi Takahashi, Daisuke Yoshida
We find that the recently-proposed ghost-free interaction of a 2-form gauge field in four dimensions, which contains derivative couplings in a nonperturbative manner, can be regard…
Effective Field Theory of Anisotropic Inflation and Beyond
Jinn-Ouk Gong, Toshifumi Noumi, Gary Shiu +3
We develop an effective-field-theory (EFT) framework for inflation with various symmetry breaking pattern. As a prototype, we formulate anisotropic inflation from the perspective o…
Linear stability analysis of hairy black holes in quadratic degenerate higher-order scalar-tensor theories: Odd-parity perturbations
Kazufumi Takahashi, Hayato Motohashi, Masato Minamitsuji
We study static spherically symmetric black hole solutions with a linearly time-dependent scalar field and discuss their linear stability in the shift- and reflection-symmetric sub…