403 citations · 3.2k across the 103 of their papers we have counts for
6 papers · 1 filter
Holographic Principle and String Cosmology
Dongsu Bak, Soo-Jong Rey
String cosmology is revisited from cosmological viewpoint of holographic principle put forward by `t Hooft, and by Fischler and Susskind. It is shown that the holography requires e…
Factorization and q-Deformed Algebra of Quantum Anharmonic Oscillator
Dongsu Bak, Sang Pyo Kim, Sung Ku Kim +2
We have studied the underlying algebraic structure of the anharmonic oscillator by using the variational perturbation theory. To the first order of the variational perturbation, th…
Perturbation Method beyond the Variational Gaussian Approximation: The Liouville-Neumann Approach
Dongsu Bak, Sang Pyo Kim, Sung Ku Kim +2
We have developed a variational perturbation theory based on the Liouville-Neumann equation, which enables one to systematically compute the perturbative correction terms to the va…
Dynamics of BPS States in the Dirac-Born-Infeld Theory
Dongsu Bak, Joohan Lee, Hyunsoo Min
The Dirac-Born-Infeld action with transverse scalar fields is considered to study the dynamics of various BPS states. We first describe the characteristic properties of the so-call…
Quantum Inflaton Dynamics
Dongsu Bak, Sang Pyo Kim, Sung Ku Kim +2
We show that the quantum dynamics of a real scalar field for a large class of potentials in the symmetric Gaussian state, where the nonperturbative quantum contributions are taken…
Fractal Diffraction Grating
Dongsu Bak, Sang Pyo Kim, Sung Ku Kim +2
We consider an optical diffraction grating in which the spatial distribution of open slits forms a fractal set. The Fraunhofer diffraction patterns through the fractal grating are…