Zobrazeno 1 - 10
of 64
pro vyhledávání: '"Naritaka Oshita"'
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 5, Pp 1-19 (2023)
Abstract The emergence of a four-dimensional de Sitter (dS4) universe on an expanding bubble in the five-dimensional anti-de Sitter (AdS5) background has been suggested as a possible cosmological scenario. It is motivated by the difficulties in the r
Externí odkaz:
https://doaj.org/article/1e7737259ed846e997dce25c1c01a5a5
Autor:
Naritaka Oshita, Niayesh Afshordi
Publikováno v:
Physics Letters B, Vol 841, Iss , Pp 137901- (2023)
We estimate the canonical entropy of a quantum black hole by counting its quasi-normal modes. We first show that the partition function of a classical black hole, evaluated by counting the quasi-normal modes with a thermodynamic Boltzmann weight, lea
Externí odkaz:
https://doaj.org/article/c2bad0221b16498882fccbf394061cc7
Publikováno v:
Journal of High Energy Physics, Vol 2020, Iss 9, Pp 1-14 (2020)
Abstract We extend the concept of Hawking-Moss, or up-tunnelling, transitions in the early universe to include black hole seeds. The black hole greatly enhances the decay amplitude, however, order to have physically consistent results, we need to imp
Externí odkaz:
https://doaj.org/article/2079235b195c461eb91bfde1042c1017
Publikováno v:
Journal of High Energy Physics, Vol 2020, Iss 8, Pp 1-27 (2020)
Abstract False vacuum decay is a key feature in quantum field theories and exhibits a distinct signature in the early Universe cosmology. It has recently been suggested that the false vacuum decay is catalyzed by a black hole (BH), which might cause
Externí odkaz:
https://doaj.org/article/b569051ad436491c9878d23216784a45
Publikováno v:
Journal of High Energy Physics, Vol 2020, Iss 7, Pp 1-22 (2020)
Abstract Static oscillating bounces in Schwarzschild de Sitter spacetime are investigated. The oscillating bounce with many oscillations gives a super-thick bubble wall, for which the total vacuum energy increases while the mass of the black hole dec
Externí odkaz:
https://doaj.org/article/7c77f12821314a6a91f56a463eae419a
Publikováno v:
Journal of High Energy Physics, Vol 2020, Iss 1, Pp 1-21 (2020)
Abstract We investigate a vacuum decay around a spinning seed black hole by using the Israel junction condition and conclude that the spin of black hole would suppress a vacuum decay rate compared to that for a non-spinning case, provided that the su
Externí odkaz:
https://doaj.org/article/5b9199cb74c1495487762b79965cc239
Publikováno v:
Physics Letters B, Vol 791, Iss , Pp 149-155 (2019)
We discuss vacuum decays catalyzed by spherical and horizonless objects and show that an ultra compact object could catalyze a vacuum decay around it within the cosmological time. The catalytic effect of a horizonless compact object could be more eff
Externí odkaz:
https://doaj.org/article/61b144a61b1549039b5b9ddd8488fd8f
Autor:
Naritaka Oshita, Jun'ichi Yokoyama
Publikováno v:
Physics Letters B, Vol 785, Iss , Pp 197-200 (2018)
We discuss a two-step mechanism to create a new inflationary domain beyond a wormhole throat which is created by a phase transition around an evaporating black hole. The first step is creation of a false vacuum bubble with a thin-wall boundary by the
Externí odkaz:
https://doaj.org/article/8d8020aab4734a11a3a6c20928362040
Publikováno v:
Journal of High Energy Physics, Vol 2020, Iss 10, Pp 1-1 (2020)
However, the diagonalized metric is not exactly obtained by the transformation but is valid approximately, which was missed in the original paper. This does not affect our results and conclusion as is explained below.
Externí odkaz:
https://doaj.org/article/48e285703c5e43b4b71a4e368855eb11
Publikováno v:
Universe, Vol 6, Iss 3, p 43 (2020)
Black Holes are possibly the most enigmatic objects in our universe. From their detection in gravitational waves upon their mergers, to their snapshot eating at the centres of galaxies, black hole astrophysics has undergone an observational renaissan
Externí odkaz:
https://doaj.org/article/c2dcf9f0b7844f86ae62b5746c53e098