804 citations · 3.3k across the 158 of their papers we have counts for
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Gravitational Collapse and Calogero Model
Dongsu Bak, Sang Pyo Kim, Sung Ku Kim +2
We study the analytic structure of the S-matrix which is obtained from the reduced Wheeler-DeWitt wave function describing spherically symmetric gravitational collapse of massless…
Entropy Production and Thermodynamic Arrow of Time in a Recollapsing Universe
Sang Pyo Kim
We investigate the thermodynamic arrow of time in a time-symmetrically recollapsing universe by calculating quantum mechanically the entropy production of a massive scalar field. I…
Nonequilibrium Quantum Evolution of Open Systems
Sang Pyo Kim
We apply the Liouville-von Neumann (LvN) approach to open systems to describe the nonequilibrium quantum evolution. The Liouville-von Neumann approach is a unified method that can…
Canonical Quantization of a Closed Euclidean Universe with a Cosmological Constant
Sang Pyo Kim
We study canonical quantization of a closed Euclidean universe with a cosmological constant and a massless scalar field. The closed Euclidean universe with an ordinary matter state…
The traversable wormhole with classical scalar fields
S. -W. Kim, S. P. Kim
We study the Lorentzian static traversable wormholes coupled to quadratic scalar fields. We also obtain the solutions of the scalar fields and matters in the wormhole background an…
Wave Functions for Quantum Black Hole Formation in Scalar Field Collapse
Dongsu Bak, Sang Pyo Kim, Sung Ku Kim +2
We study quantum mechanically the self-similar black hole formation by collapsing scalar field and find the wave functions that give the correct semiclassical limit. In contrast to…
Semiclassical Limit and Time in Quantum Cosmology
Dongsu Bak, Sang Pyo Kim, Sung Ku Kim +2
We propose a method to recover the time variable and the classical evolution of the Universe from the minisuperspace wave function of the Wheeler-DeWitt equation. Defining a Hamilt…
One-Parameter Gaussian State of Anharmonic Oscillator: Nonlinear Realization of Bogoliubov Transformation
Jung Kon Kim, Sang Pyo Kim, Kwang-Gi Park
We find a one-parameter Gaussian state for an anharmonic oscillator with quadratic and quartic terms, which depends on the energy expectation value. For the weak coupling constant,…
Quantum Field Theory in a Topology Changing Universe
Sang Pyo Kim
We propose a method to construct quantum theory of matter fields in a topology changing universe. Analytic continuation of the semiclassical gravity of a Lorentzian geometry leads…
Renormalization of Black Hole Entropy
Sang Pyo Kim, Sung Ku Kim, Kwang-Sup Soh +1
We review the renormalization of one-loop effective action for gravity coupled to a scalar field and that of the Bekenstein-Hawking entropy of a black hole plus the statistical ent…
Quantum Creation of Black Hole by Tunneling in Scalar Field Collapse
Dongsu Bak, Sang Pyo kim, Sung Ku Kim +2
Continuously self-similar solution of spherically symmetric gravitational collapse of a scalar field is studied to investigate quantum mechanical black hole formation by tunneling…