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18 papers
Asymptotic behavior of null geodesics near future null infinity II: curvatures, photon surface and dynamically transversely trapping surface
Masaya Amo, Tetsuya Shiromizu, Keisuke Izumi +2
Bearing in mind our previous study on asymptotic behavior of null geodesics near future null infinity, we analyze the behavior of geometrical quantities such as a certain extrinsic…
On uniqueness of static spacetime with conformal scalar in higher dimensions
Keisuke Izumi, Yoshimune Tomikawa, Tetsuya Shiromizu
We discuss the uniqueness of asymptotically flat and static spacetimes in the -dimensional Einstein-conformal scalar system. This theory potentially has a singular point in the…
Divergence equations and uniqueness theorem of static spacetimes with conformal scalar hair
Takeshi Shinohara, Yoshimune Tomikawa, Keisuke Izumi +1
We reexamine the Israel-type proof of the uniqueness theorem of the static spacetime outside the photon surface in the Einstein-conformal scalar system. We derive in a systematic f…
Asymptotic behavior of null geodesics near future null infinity: Significance of gravitational waves
Masaya Amo, Keisuke Izumi, Yoshimune Tomikawa +2
We investigate the behavior of null geodesics near future null infinity in asymptotically flat spacetimes. In particular, we focus on the asymptotic behavior of null geodesics that…
Area bound for surfaces in generic gravitational field
Keisuke Izumi, Yoshimune Tomikawa, Tetsuya Shiromizu +1
We define an attractive gravity probe surface (AGPS) as a compact 2-surface with positive mean curvature satisfying (for a constant ) in t…
Observations of the Origin of Downward Terrestrial Gamma-Ray Flashes
J. W. Belz, P. R. Krehbiel, J. Remington +137
In this paper we report the first close, high-resolution observations of downward-directed terrestrial gamma-ray flashes (TGFs) detected by the large-area Telescope Array cosmic ra…