Zobrazeno 1 - 10
of 74
pro vyhledávání: '"Takahiro Terada"'
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 1, Pp 1-24 (2024)
Abstract We study the cancellation of quantum corrections on the superhorizon curvature perturbations from subhorizon physics beyond the single-clock inflation from the viewpoint of the cosmological soft theorem. As an example, we focus on the transi
Externí odkaz:
https://doaj.org/article/8cfe0b2ad128442c8940b881d290f619
Autor:
Shuntaro Aoki, Takahiro Terada
Publikováno v:
Journal of High Energy Physics, Vol 2022, Iss 2, Pp 1-29 (2022)
Abstract We study the nonlinear realization of supersymmetry in a dynamical/cosmological background in which derivative terms like kinetic terms are finite. Starting from linearly realized theories, we integrate out heavy modes without neglecting der
Externí odkaz:
https://doaj.org/article/9f8482307d9a47dbb4812a77cfa52102
Autor:
Hiroki Matsui, Takahiro Terada
Publikováno v:
Journal of High Energy Physics, Vol 2020, Iss 10, Pp 1-30 (2020)
Abstract The Hartle-Hawking no-boundary proposal describes the quantum creation of the universe. To have a non-negligible probability to obtain a classical expanding universe, eternal inflation is required, which is severely constrained by Swampland
Externí odkaz:
https://doaj.org/article/09819ae3b72649c8a3a6db1d3bb17fa7
Publikováno v:
Physics Letters B, Vol 795, Iss , Pp 152-159 (2019)
We find a class of solutions for a homogeneous and isotropic universe in which the initially expanding universe stops expanding, experiences contraction, and then expands again (the “bounce”), in the framework of Einstein gravity with a real scal
Externí odkaz:
https://doaj.org/article/05ad113062364ba99400bf64504c12a5
Autor:
Kazunori Kohri, Takahiro Terada
Publikováno v:
Physics Letters B, Vol 813, Iss , Pp 136040- (2021)
The NANOGrav collaboration for the pulsar timing array (PTA) observation recently announced evidence of an isotropic stochastic process, which may be the first detection of the stochastic gravitational-wave (GW) background. We discuss the possibility
Externí odkaz:
https://doaj.org/article/eaac8453ee00467994495babc311f8b0
Publikováno v:
Journal of High Energy Physics, Vol 2018, Iss 9, Pp 1-16 (2018)
Abstract In supersymmetric theories, the signs of quartic terms in the Kähler potential control the stability of non-supersymmetric field configurations. In particular, in supersymmetric inflation models, the signs are important for the stability of
Externí odkaz:
https://doaj.org/article/4174a1e0337c408284e6d4a20f006ac4
Publikováno v:
Physics Letters B, Vol 777, Iss , Pp 270-274 (2018)
We discuss the cosmological gravitino problem in inflation models in which the inflaton potential is constructed from Kähler potential rather than superpotential: a representative model is D3‾-induced geometric inflation. A critical ingredient in
Externí odkaz:
https://doaj.org/article/f39863582b0f4295bfed046fad5ffc41
Publikováno v:
Physics Letters B, Vol 767, Iss C, Pp 392-397 (2017)
We study non-thermal gravitino production in the minimal supergravity inflation. In this minimal model utilizing orthogonal nilpotent superfields, the particle spectrum includes only graviton, gravitino, inflaton, and goldstino. We find that a substa
Externí odkaz:
https://doaj.org/article/6f2b4d01059a4ff9984d510adc77dc55
Autor:
Takahiro Terada
Publikováno v:
Physics Letters B, Vol 760, Iss C, Pp 674-680 (2016)
A reformulation of inflationary model analyses appeared recently, in which inflationary observables are determined by the structure of a pole in the inflaton kinetic term rather than the shape of the inflaton potential. We comprehensively study this
Externí odkaz:
https://doaj.org/article/7fa17eec3a0a479d8fe7ba616dd8d5c8
Autor:
Sergei V. Ketov, Takahiro Terada
Publikováno v:
Physics Letters B, Vol 752, Iss C, Pp 108-112 (2016)
Large-field inflation in supergravity requires the approximate global symmetry needed to protect flatness of the scalar potential. In helical-phase inflation, the U(1) symmetry of the Kähler potential is assumed, the phase part of the complex scalar
Externí odkaz:
https://doaj.org/article/b896304ec5af47c281bd01bfc6c970c9