Zobrazeno 1 - 10
of 67
pro vyhledávání: '"Taishi Katsuragawa"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 12, Pp 1-17 (2020)
Abstract The recent observations from CMB have imposed a very stringent upper-limit on the tensor/scalar ratio r of inflation models, $$r < 0.064$$ r < 0.064 , which indicates that the primordial gravitational waves (PGW), even though possible to be
Externí odkaz:
https://doaj.org/article/910e92fdfba74f74a10837eab31edbc1
Compact star in general F(R) gravity: Inevitable degeneracy problem and non-integer power correction
Publikováno v:
Physics Letters B, Vol 826, Iss , Pp 136929- (2022)
We investigate a compact star in the general F(R) gravity. Developing a novel formulation in the spherically symmetric and static space-time with the matter, we confirm that an arbitrary relation between the mass M and the radius Rs of the compact st
Externí odkaz:
https://doaj.org/article/76ba4e4fa8f24fe4ab897e972edaac9f
Publikováno v:
Journal of High Energy Physics, Vol 2020, Iss 2, Pp 1-29 (2020)
Abstract We study the chameleon field dark matter, dubbed scalaron, in F (R) gravity in the Big Bang Nucleosynthesis (BBN) epoch. With an R 2-correction term required to solve the singularity problem for F (R) gravity, we first find that the scalaron
Externí odkaz:
https://doaj.org/article/2179c1a3e33f43d88115385536ebc713
Publikováno v:
Physical Review D. 107
Publikováno v:
SCIENTIA SINICA Physica, Mechanica & Astronomica.
Publikováno v:
Physics Letters B, Vol 755, Iss , Pp 31-36 (2016)
We consider the Palatini formalism of the Born–Infeld gravity. In the Palatini formalism, the propagating mode is only graviton, whose situation is different from that in the metric formalism. We discuss the FRW cosmology by using an effective pote
Externí odkaz:
https://doaj.org/article/8d864359a0414d3a940af6dd192c46cd
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 12, Pp 1-17 (2020)
European Physical Journal
European Physical Journal
The recent observations from CMB have imposed a very stringent upper-limit on the tensor/scalar ratio $r$ of inflation models, $r < 0.064$, which indicates that the primordial gravitational waves (PGW), even though possible to be detected, should hav
$f(Q)$ gravity is an extension of the symmetric teleparallel equivalent to general relativity. We demonstrate the Hamiltonian analysis of $f(Q)$ gravity with fixing the coincident gauge condition. Using the standard Dirac-Bergmann algorithm, we show
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::63afef2358bb3630e92a8c34421f2795
http://arxiv.org/abs/2204.12826
http://arxiv.org/abs/2204.12826
Publikováno v:
Physics Letters
Physics Letters B, Vol 826, Iss, Pp 136929-(2022)
Physics Letters B, Vol 826, Iss, Pp 136929-(2022)
We investigate a compact star in the general $F(R)$ gravity. Developing a novel formulation in the spherically symmetric and static space-time with the matter, we confirm that an arbitrary relation between the mass $M$ and the radius $R_s$ of the com
Publikováno v:
Physical Review D. 105