5 papers
New variational perturbation theory based on deformed oscillator
Hyeong-Chan Kim, Jae Hyung Yee, Sang Pyo Kim
A new variational perturbation theory is developed based on the deformed oscillator. It is shown that the new variational perturbation method provides 200 or 10 times better ac…
Open and Closed Universes in Brane-World Cosmology
Hyeong-Chan Kim, Jae Hyung Yee, Mu-In Park
We find two types [called (S) and (A)] of new vacuum solutions of open, flat, and closed universes which are inflating in the brane-world scenario. We show that the warp factor of…
Black Hole Entropy and Exclusion Statistics
Hyeong-Chan Kim, Yoonbai Kim, Phillial Oh
We compute the entropy of systems of quantum particles satisfying the fractional exclusion statistics in the space-time of 2+1 dimensional black hole by using the brick-wall method…
The origin of the area law of the entropy of a quantum field in a black hole
Hyeong-Chan Kim, Min-Ho Lee, Jeong-Young Ji
It is shown that that the area law for the entropy of a quantum field in the Schwarzschild black hole is due to the quantum statistics. The entropies for one particle, a Boltzmann…
Bose-Einstein condensation for a self-interacting theory in curved spacetime
Min-Ho Lee, Hyeong-Chan Kim, Jae Kwan Kim
The effective action is derived for a self-interacting theory with a finite fixed charge at finite temperature in curved spacetime. We obtain the high temperature expansion…