Cosmological Imprint of the Second Law of Thermodynamics (2008)
Kim, Hyeong-Chan, Lee, Jae-Weon, Lee, Jungjai
We study the evolution of the universe in the presence of inflaton, matter, radiation, and holographic dark energy. The time evolution of the scale factor is obtained by solving the Friedmann...
Is dark energy from cosmic Hawking radiation? (2008)
Lee, Jae-Weon, Kim, Hyeong-Chan, Lee, Jungjai
We suggest that dark energy is the energy of Hawking radiation from a cosmic horizon. Despite of its extremely low Gibbons-Hawking temperature, this radiation could have the appropriate magnitude and...
Geometrical properties of the trans-spherical solutions in higher dimensions (2008)
Kang, Gungwon, Kim, Hyeong-Chan, Lee, Jungjai
We investigate the geometrical properties of static vacuum $p$-brane solutions of Einstein gravity in $D=n+p+3$ dimensions, which have spherical symmetry of $S^{n+1}$ orthogonal to the $p$-directions...
Black hole as an Information Eraser (2007)
Kim, Hyeong-Chan, Lee, Jae-Weon, Lee, Jungjai
We discuss the identity of black hole entropy and show that the first law of black hole thermodynamics, in the case of a Schwarzschild black hole, can be derived from Landauer's principle by assuming...
Quantum Informational Dark Energy: Dark energy from forgetting (2007)
Lee, Jae-Weon, Lee, Jungjai, Kim, Hyeong-Chan
We suggest that dark energy has a quantum informational origin. Landauer's principle associated with the erasure of quantum information at a cosmic horizon implies the non-zero vacuum energy having...
Extraordinary vacuum black string solutions (2007)
Kim, Hyeong-Chan, Lee, Jungjai
In addition to the boosted static solution there are two other classes of stationary string-like solutions of the vacuum Einstein equation in (4+1)-dimensions. Each class is characterized by three...
Black string and velocity frame dragging (2007)
Lee, Jungjai, Kim, Hyeong-Chan
We investigate velocity frame dragging with the boosted Schwarzschild black string solution and the boosted Kaluza-Klein bubble solution, in which a translational symmetry along the boosted...
Dark energy, inflation and the cosmic coincidence problem (2007)
Lee, Jungjai, Kim, Hyeong-Chan, Lee, Jae-Weon
We show that holographic dark energy could explain why the current dark energy density is so small, if there was an inflation with a sufficient expansion in the early universe. It is also suggested...
Stationary vacuum hyper-cylindrical solution in 4+1 dimensions (2007)
Lee, Jungjai, Kim, Hyeong-Chan
We find a 4+1 dimensional stationary vacuum hyper-cylindrical solution solution which is spherically symmetric in $3-$dimensions and invariant under the translation along the fifth coordinate. The...
Dark energy from vacuum entanglement (2007)
Lee, Jae-Weon, Lee, Jungjai, Kim, Hyeong-Chan
We suggest that vacuum entanglement energy associated with the entanglement entropy of the universe is the origin of dark energy. The observed properties of dark energy can be explained by using the...
Cosmic D- and DF-strings from D3Dbar3: Black Strings and BPS Limit (2006)
Kim, Taekyung, Kim, Yoonbai, Kyae, Bumseok, Lee, Jungjai
We study D- and DF-strings in a D3${\bar {\rm D}}3$ system by using Dirac-Born-Infeld type action. In the presence of an electric flux from the transverse direction, we discuss gravitating thick...
Instanton-inspired Model of QCD Phase Transition and Bubble Dynamics (2005)
Ji, Chueng-Ryong, Kang, Gungwon, Lee, Jungjai
We have reinvestigated the collision of gluonic bubbles in a SU(2) model of QCD which was studied by Johnson, Choi and Kisslinger in the context of the instanton-inspired model of QCD phase...
Global and Local D-vortices (2005)
Kim, Yoonbai, Kyae, Bumseok, Lee, Jungjai
Codimension-two objects on a system of brane-antibrane are studied in the context of Born-Infeld type effective field theory with a complex tachyon and U(1)$\times$U(1) gauge fields. When the radial...
Classical Stability of Black D3-branes (2004)
We have investigated the classical stability of charged black $D3$-branes in type IIB supergravity under small perturbations. For s-wave perturbations it turns out that black $D3$-branes are unstable...
Black Brane World from Gravitating Half $\sigma$-lump (2004)
Kim, Donghyun, Kim, Yoonbai, Lee, JungJai
We study O($N+1$) nonlinear $\sigma$-model in $(p+1+N)$-dimensional curved spacetime with negative cosmological constant, and find a new $\sigma$-lump solution with half-integer winding and divergent...
Brane World of Warp Geometry: An Introductory Review (2003)
Kim, Yoonbai, Lee, Chong Oh, Lee, Ilbong, Lee, JungJai
Basic idea of Randall-Sundrum brane world model I and II is reviewed with detailed calculation. After introducing the brane world metric with exponential warp factor, metrics of Randall-Sundrum...
Composite Operators and Topological Contributions in Gauge Theory (2001)
In $D$-dimensional gauge theory with a kinetic term based on the p-form tensor gauge field, we introduce a gauge invariant operator associated with the composite formed from a electric $(p-1)$-brane...
On Wilson Surfaces in Topological Chern-Simons Interaction in (3+1) Dimensions (1996)
We comment on the regularization of the expectation values of Wilson surfaces for the bosonic string in the (3+1) dimensions. We analyze the singular behaviors of propagator for the Chern-Simons...