Zobrazeno 1 - 10
of 61
pro vyhledávání: '"Seoktae Koh"'
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 2, Pp 1-19 (2024)
Abstract We investigate the charged Vaidya spacetime with conformal symmetry by classifying the horizons and finding its connection to Hawking temperature. We find a conformal Killing vector whose existence requires the mass and electric charge funct
Externí odkaz:
https://doaj.org/article/5323d324b0474a66be5b57c2e3c793fb
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 1, Pp 1-10 (2024)
Abstract In this work, we study the existence of gradient (proper) CKVs in locally rotationally symmetric spacetimes (LRS), those CKVs in the space spanned by the tangent to observers’ congruence and the preferred spatial direction, allowing us to
Externí odkaz:
https://doaj.org/article/29f0ffc57b83403987adb953e5111e4c
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 11, Pp 1-28 (2023)
Abstract It was shown that Yang-Mills instantons on an internal space can trigger the expansion of our four-dimensional universe as well as the dynamical compactification of the internal space. We generalize the instanton-induced inflation and dynami
Externí odkaz:
https://doaj.org/article/870eb7aa13a648a5aa7bc970086731cf
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 6, Pp 1-27 (2023)
Abstract In this work, we study cosmological solutions of the 8-dimensional Einstein Yang-Mills theory coupled to a perfect-fluid matter. A Yang-Mills instanton of extra dimensions causes a 4-dimensional expanding universe with dynamical compactifica
Externí odkaz:
https://doaj.org/article/6a5fef0cd8f342db957c54ba966b37ad
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 3, Pp 1-11 (2022)
Abstract For the subclass of Horndeski theory of gravity, we investigate the effects of reheating on the predictions of natural inflation. In the presence of derivative self-interaction of a scalar field and its kinetic coupling to the Einstein tenso
Externí odkaz:
https://doaj.org/article/b32b4eee6f7b4780b5d954c1808ab599
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 8, Pp 1-15 (2020)
Abstract We investigate the time-dependent entanglement entropy in the AdS space with a dS boundary which represents an expanding spacetime. On this time-dependent spacetime, we show that the Ryu–Takayanagi formula, which is usually valid in the st
Externí odkaz:
https://doaj.org/article/d2b8fcafb4df48e3b6864da60e7dfc1b
Publikováno v:
Journal of High Energy Physics, Vol 2018, Iss 12, Pp 1-26 (2018)
Abstract We consider an eight-dimensional Einstein-Yang-Mills theory to explore whether Yang-Mills instantons formed in extra dimensions can induce the dynamical instability of our four-dimensional spacetime. We show that the Yang-Mills instantons in
Externí odkaz:
https://doaj.org/article/0febcf1a54da4d2a89946b87e5e341d8
Autor:
Seoktae Koh
Publikováno v:
New Physics: Sae Mulli. 73:74-78
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::22b7b5d56766aaad2218ff460465ddc8
https://doi.org/10.3938/npsm.73.74
https://doi.org/10.3938/npsm.73.74
Publikováno v:
Physics and High Technology. 29:26-30
A brief review on inflation is given from the quantum gravity perspective. Using the effective field theory, we discuss quantum fluctuations and how they evolve into classical perturbations. We then list some limitations on de Sitter space model buil
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c34733174203f439516eae96bd7fc330
https://doi.org/10.3938/phit.29.041
https://doi.org/10.3938/phit.29.041
Autor:
Seoktae Koh
Publikováno v:
New Physics: Sae Mulli. 69:1308-1312
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c3c1c5fb7e591e07f3963e9e73605fd9
https://doi.org/10.3938/npsm.69.1308
https://doi.org/10.3938/npsm.69.1308