25 citations · 65 across the 14 of their papers we have counts for
9 papers · 1 filter
Curvature and Isocurvature Perturbations in multi-field Gauss-Bonnet inflation
Seoktae Koh
We study cosmological perturbations in multi-field inflation in which the scalar fields couple to the Gauss-Bonnet terms through a general coupling function . We derive the…
Higgs Inflation with a Gauss-Bonnet term
Seoktae Koh, Seong Chan Park, Gansukh Tumurtushaa
Higgs inflation with a Gauss-Bonnet term is studied in the Einstein frame. Our model features two coupling functions, and , coupled to the Ricci scalar and Gauss-Bon…
Existence of gradient CKV and gradient conformally stationary LRS spacetimes
Seoktae Koh, Abbas M Sherif, Gansukh Tumurtushaa
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' cong…
Configuration entropy and instability of accelerating black hole in AdS
Seoktae Koh, Chong Oh Lee
We consider an accelerating black hole with a negative cosmological constant in four-dimensional spacetime. There are two configurations such as a black string (BS) phase when a ma…
Primordial black holes and induced gravitational waves from inflation in the Horndeski theory of gravity
Pisin Chen, Seoktae Koh, Gansukh Tumurtushaa
We investigate the production of primordial black holes (PBHs) and scalar-induced gravitational waves (GWs) for cosmological models in the Horndeski theory of gravity. The cosmolog…
Constraints on dark energy models from the Horndeski theory
Bilguun Bayarsaikhan, Seoktae Koh, Enkhbat Tsedenbaljir +1
In light of the cosmological observations, we investigate dark energy models from the Horndeski theory of gravity. In particular, we consider cosmological models with the derivativ…