27 citations · 52 across the 4 of their papers we have counts for
11 papers
Unstable D-branes and String Cosmology
Chanju Kim, Hang Bae Kim, Yoonbai Kim +2
Cosmological implication of rolling tachyons is reported in the context of effective field theory. With a brief review of rolling tachyons in both flat and curved spacetimes, we st…
Classical stability of stringy wormholes in flat and AdS spaces
Jin Young Kim, Yoonbai Kim, James E. Hetrick
We study small fluctuations of the stringy wormhole solutions of graviton-dilaton-axion system in arbitrary dimensions. We show under O()-symmetric harmonic perturbation that th…
Cosmology of Rolling Tachyon
Chanju Kim, Hang Bae Kim, Yoonbai Kim +1
We study dynamics of rolling tachyon and Abelian gauge field on unstable D-branes, of which effective action is given by Born-Infeld type nonlocal action. Possible cosmological evo…
Classical Geometry of De Sitter Spacetime : An Introductory Review
Yoonbai Kim, Chae Young Oh, Namil Park
Classical geometry of de Sitter spacetime is reviewed in arbitrary dimensions. Topics include coordinate systems, geodesic motions, and Penrose diagrams with detailed calculations.
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…
Thirring Model in Lower Dimensions: Nonperturbative Approaches
Yoonbai Kim
A reformulation of the Thirring model as a gauge theory on both continuum spacetime and discretized lattice is reviewed. In (1+1) dimensions, our result reproduces consistently the…