Zobrazeno 1 - 10
of 198
pro vyhledávání: '"Jinn Ouk Gong"'
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 10, Pp 1-21 (2023)
Abstract We show that the general vacuum states that respect the de Sitter symmetry, known as the α-vacua, can introduce non-vanishing parity-violating tensor non-Gaussianities. This is due to the mixing by the Bogoliubov transformation of the posit
Externí odkaz:
https://doaj.org/article/71b8a3060e2f4001bd8d59002804ccdd
Publikováno v:
Physics Letters B, Vol 845, Iss , Pp 138126- (2023)
We investigate the mass range and the corresponding free-streaming length scale of dark matter produced non-thermally from decay of heavy objects which can be either dominant or sub-dominant at the moment of decay. We show that the resulting dark mat
Externí odkaz:
https://doaj.org/article/e6941226a58e4c79890e6840b6f8e05c
Autor:
Jinn-Ouk Gong, Min-Seok Seo
Publikováno v:
Journal of High Energy Physics, Vol 2020, Iss 3, Pp 1-26 (2020)
Abstract We study the Wigner function for the inflationary tensor perturbation defined in the real phase space. We compute explicitly the Wigner function including the contributions from the cubic self-interaction Hamiltonian of tensor perturbations.
Externí odkaz:
https://doaj.org/article/fa13b44ed9cb42338870ea70cd020c0b
Autor:
Jinn-Ouk Gong, Min-Seok Seo
Publikováno v:
Journal of High Energy Physics, Vol 2019, Iss 5, Pp 1-39 (2019)
Abstract We study the quantum mechanical evolution of the tensor perturbations during inflation with non-linear tensor interactions. We first obtain the Lindblad terms generated by non-linear interactions by tracing out unobservable sub-horizon modes
Externí odkaz:
https://doaj.org/article/13b7d5ca1f2d4a77aed249244b962961
Publikováno v:
Physics Letters B, Vol 769, Iss C, Pp 413-417 (2017)
We compute for general single-field inflation the intrinsic non-Gaussianity due to the self-interactions of the inflaton field in the squeezed limit. We recover the consistency relation in the context of the δN formalism, and argue that there is a p
Externí odkaz:
https://doaj.org/article/ea4f26feeb7044ac9015abea35a6296b
Publikováno v:
Physics Letters B, Vol 760, Iss C, Pp 297-301 (2016)
We study features in the bispectrum of the primordial curvature perturbation correlated with the reconstructed primordial power spectrum from the observed cosmic microwave background temperature data. We first show how the bispectrum can be completel
Externí odkaz:
https://doaj.org/article/0ae387a465c541c7a47f5ab930c1ff14
Autor:
Jaiyul Yoo, Jinn-Ouk Gong
Publikováno v:
Physics Letters B, Vol 754, Iss C, Pp 94-98 (2016)
We present the third-order analytic solution of the matter density fluctuation in the proper-time hypersurface of nonrelativistic matter flows by solving the nonlinear general relativistic equations. The proper-time hypersurface provides a coordinate
Externí odkaz:
https://doaj.org/article/235353f381004e89804771f249c67206
Publikováno v:
Nuclear Physics B, Vol 900, Iss C, Pp 517-532 (2015)
We present a series of theoretical constraints on the potentially viable inflation models that might yield a blue spectrum for primordial tensor perturbations. By performing a detailed dynamical analysis we show that, while there exists such possibil
Externí odkaz:
https://doaj.org/article/25873ee96f754a6d847ee9fdff98ca35
Autor:
Jinn-Ouk Gong, Misao Sasaki
Publikováno v:
Physics Letters B, Vol 747, Iss C, Pp 390-394 (2015)
We revisit the notion of slow-roll in the context of general single-field inflation. As a generalization of slow-roll dynamics, we consider an inflaton ϕ in an attractor phase where the time derivative of ϕ is determined by a function of ϕ, ϕ˙=
Externí odkaz:
https://doaj.org/article/50f8558363ff407c93e8ff7bd42f50a8
Publikováno v:
Physics Letters B, Vol 738, Iss , Pp 20-24 (2014)
We describe extended theories which shares the gauge transformation symmetry of the T-models, and takes the T-models as well as Starobinsky model as special cases. We derive a general relation between the two slow-roll parameters, and find that a lar
Externí odkaz:
https://doaj.org/article/12a020998e8a495e924bfbb390ffe985