99 citations · 558 across the 40 of their papers we have counts for
4 papers · 1 filter
Observational constraints on inflation with the nonlinear sigma fields in light of Plank 2015
Seoktae Koh, Bum-Hoon Lee, Gansukh Tumurtushaa
We study an inflation model with a nonlinear sigma field which has symmetry. The background solution of the nonlinear sigma field is proportional to the space coordinates l…
Primordial gravitational waves from the space-condensate inflation model
Seoktae Koh, Bum-Hoon Lee, Gansukh Tumurtushaa
We consider the space-condensate inflation model to study the primordial gravitational waves generated in the early Universe. We calculate the energy spectrum of gravitational wave…
Constraints on modified Gauss-Bonnet gravity during big bang nucleosynthesis
Motohiko Kusakabe, Seoktae Koh, K. S. Kim +1
The modified gravity is considered to be one of possible explanations of the accelerated expansions of the present and the early universe. We study effects of the modified gravity…
Corrected constraints on big bang nucleosynthesis in a modified gravity model of
Motohiko Kusakabe, Seoktae Koh, K. S. Kim +1
Big bang nucleosynthesis in a modified gravity model of is investigated. The only free parameter of the model is a power-law index . We find cosmological solut…