125 citations · 1.5k across the 62 of their papers we have counts for
4 papers · 1 filter
Matter scattering in gravity and unitarity
Yugo Abe, Takeo Inami, Keisuke Izumi +1
We investigate the ultraviolet (UV) behavior of two-scalar elastic scattering with graviton exchanges in higher curvature gravity theory. In the Einstein gravity, matter scattering…
Extension of photon surfaces and their area: Static and stationary spacetimes
Hirotaka Yoshino, Keisuke Izumi, Tetsuya Shiromizu +1
We propose a new concept, the transversely trapping surface (TTS), as an extension of the static photon surface characterizing the strong gravity region of a static/stationary spac…
Area bound for a surface in a strong gravity region
Tetsuya Shiromizu, Yoshimune Tomikawa, Keisuke Izumi +1
For asymptotically flat spacetimes, using the inverse mean curvature flow, we show that any compact -surface, , whose mean curvature and its derivative for outward directio…
On uniqueness of static spacetimes with non-trivial conformal scalar field
Yoshimune Tomikawa, Tetsuya Shiromizu, Keisuke Izumi
We discuss the uniqueness of the static spacetimes with non-trivial conformal scalar field. Then, we can show that the spacetime is unique to be the Bocharova-Bronnikov-Melnikov-Be…