Zobrazeno 1 - 10
of 1 225
pro vyhledávání: '"Shiromizu A"'
We derive areal inequalities for five types of attractive gravity probe surfaces, which were proposed by us in order to characterize the strength of gravity in different ways including weak gravity region, taking into account of contributions of elec
Externí odkaz:
http://arxiv.org/abs/2407.20636
We construct the marginal loosely trapped surface (marginal LTS) for the Kerr spacetime with a small Kerr parameter perturbatively, where the LTS condition is saturated. An LTS is a surface that specifies the strong gravity region, which is a general
Externí odkaz:
http://arxiv.org/abs/2407.04175
Autor:
Shiromizu, Tetsuya, Izumi, Keisuke
Under certain conditions, it is shown that the positivity of the Geroch/Hawking quasi-local mass holds for the attractive gravity probe surfaces in any higher dimensions than three. We also comment on the Arnowitt-Deser-Misner mass.
Comment: 7 p
Comment: 7 p
Externí odkaz:
http://arxiv.org/abs/2310.10897
Autor:
Shiromizu, Tetsuya, Izumi, Keisuke
In four dimensional spacetimes with a positive cosmological constant, we introduce a new geometrical object associated with the cosmological horizon and then show the areal inequality. We also examine the attractive gravity probe surfaces as an indic
Externí odkaz:
http://arxiv.org/abs/2307.00506
Publikováno v:
Eur. Phys. J. C 84, 638 (2024)
In asymptotically flat spacetimes, bearing the null geodesics reaching the future null infinity in mind, we propose new concepts, the "dark horizons" as generalizations of the photon sphere. They are defined in terms of the structure of escape/captur
Externí odkaz:
http://arxiv.org/abs/2305.11208
In our previous papers [arXiv:2106.03150, arXiv:2110.10917, arXiv:2208.00822], we analyzed the asymptotic behavior of future directed null geodesics near future null infinity and then we showed a proposition on the accessibility of the null geodesics
Externí odkaz:
http://arxiv.org/abs/2305.01767
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 6, Pp 1-20 (2024)
Abstract In general asymptotically flat spacetimes, bearing the null geodesics reaching the future null infinity in mind, we propose new concepts, the “dark horizons” (outer dark horizon and inner dark horizon) as generalizations of the photon sp
Externí odkaz:
https://doaj.org/article/2c0d06aedb434b4da6587b69e65f3c7a
Autor:
Matsumoto Toshifumi, Izumi Koichi, Shiromizu Akio, Shibata Kohei, Ohta Masayuki, Kitano Seigo
Publikováno v:
Journal of Minimal Access Surgery, Vol 1, Iss 3, Pp 129-132 (2005)
As a palliative bypass for unresectable gastric or periampullary cancer, gastrojejunostomy (GJ) is sometimes associated with postoperative delayed gastric emptying. We report the successful laparoscopic application of this procedure in a 78-year-old
Externí odkaz:
https://doaj.org/article/5aee81c6daba47f0ae78b0e68777e9af
A generalization of the Riemannian Penrose inequality in $n$-dimensional space ($3\le n<8$) is done. We introduce a parameter $\alpha$ ($-\frac{1}{n-1}<\alpha < \infty$) indicating the strength of the gravitational field, and define a refined attract
Externí odkaz:
http://arxiv.org/abs/2209.14124
Publikováno v:
Phys. Rev. D 106, 084007 (2022)
A new sufficient condition for photons emitted near future null infinity to reach future null infinity is derived by studying null geodesics in the Bondi coordinates in asymptotically flat spacetimes. In our previous works [arXiv:2106.03150, arXiv:21
Externí odkaz:
http://arxiv.org/abs/2208.00822