Zobrazeno 1 - 10
of 47
pro vyhledávání: '"Atsushi Naruko"'
Publikováno v:
Physics Letters B, Vol 833, Iss , Pp 137340- (2022)
In quantum cosmology the DeWitt boundary condition is a proposal to set the wave function of the universe to vanish at the classical big-bang singularity. In this Letter, we show that in many gravitational theories including general relativity, the D
Externí odkaz:
https://doaj.org/article/772e3f505e9a456bac608dfba1b3dffa
In minisuperspace quantum cosmology, the Lorentzian path integral formulations of the no-boundary and tunneling proposals have recently been analyzed. But it has been pointed out that the wave function of linearized perturbations around a homogeneous
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::58ad822daee32ec9e6615b1df83f7771
http://arxiv.org/abs/2211.05306
http://arxiv.org/abs/2211.05306
Publikováno v:
The Fifteenth Marcel Grossmann Meeting.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a54afc60b89b8ddc0b967d80095d609d
https://doi.org/10.1142/9789811258251_0147
https://doi.org/10.1142/9789811258251_0147
Publikováno v:
Physics Letters
In quantum cosmology the DeWitt boundary condition is a proposal to set the wave function of the universe to vanish at the classical big-bang singularity. In this Letter, we show that in many gravitational theories including general relativity, the D
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7aa7c26279d1be5c0c0bab58c6b13828
http://arxiv.org/abs/2111.00665
http://arxiv.org/abs/2111.00665
Publikováno v:
Progress of Theoretical and Experimental Physics. 2021
We study the metric backreaction of mass and angular momentum accretion on black holes. We first develop the formalism of monopole and dipole linear gravitational perturbations around the Schwarzschild black holes in the Eddington-Finkelstein coordin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8041a839ec8ca9ec1015f83070717ba2
https://doi.org/10.1093/ptep/ptab101
https://doi.org/10.1093/ptep/ptab101
We develop a systematic and unified approach to estimate all possible secondary (i.e. non-primordial) nonlinear effects to the cosmic microwave background (CMB) polarization, named curve-of-sight integration approach. In this approach, the Boltzmann
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cdf7c7c34f8917929a500cbb0147c117
Autor:
Yohsuke Takamori, Atsushi Naruko, Yusuke Sakurai, Keitaro Takahashi, Daisuke Yamauchi, Chul-Moon Yoo
A disformal Kerr black hole solution is a rotating black hole solution in a modified gravity theory which breaks the circular condition of spacetime differently from the case of the Kerr spacetime. In this paper, assuming that Sagittarius A* (Sgr A*)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a9d9e6284dd4f520346449d59aee1a32
Publikováno v:
Physical Review
We investigate a Lorentz invariant action which is quadratic in two rank-2 symmetric tensor fields in Minkowski spacetime. We apply a scalar-vector-tensor decomposition to two tensor fields by virtue of 3-dimensional rotation-invariance of Minkowski
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fcb18873f99fc90f6df93aa4bce8c04c
http://arxiv.org/abs/2012.13461
http://arxiv.org/abs/2012.13461
Publikováno v:
Progress of Theoretical and Experimental Physics. 2020
It is widely believed that classical gravity breaks down and quantum gravity is needed to deal with a singularity. We show that there is a class of spacetime curvature singularities which can be resolved with metric and matter field transformations.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bd6667102bd5d96f6294c646e0cc12a7
https://doi.org/10.1093/ptep/ptaa028
https://doi.org/10.1093/ptep/ptaa028
In the wake of interest to find black hole solutions with scalar hair, we investigate the effects of disformal transformations on static spherically symmetric spacetimes with a nontrivial scalar field. In particular, we study solutions that have a si
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a198adcaaa344f1ce67b036d876db000