804 citations · 3.3k across the 158 of their papers we have counts for
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Emergence of Classicality in Quantum Phase Transitions
Sang Pyo Kim, Chul H. Lee
We show that classicality emerges during quantum phase transitions due to parametric interactions without coupling to environments. The Wigner functions are explicitly calculated f…
Non-Gaussian Effects on Domain Growth
Sang Pyo Kim, F. C. Khanna
The vacuum two-point function is calculated beyond the Gaussian approximation during the second order phase transition. It is found that the correlation function is dominated by th…
Classical and Quantum Surgery of Geometries in an Open Inflationary Universe
Sang Pyo Kim
We study classically and quantum mechanically the Euclidean geometries compatible with an open inflationary universe of a Lorentzian geometry. The Lorentzian geometry of the open u…
Schwinger Pair Production via Instantons in Strong Electric Fields
Sang Pyo Kim, Don N. Page
In the space-dependent gauge, each mode of the Klein-Gordon equation in a strong electric field takes the form of a time-independent Schrödinger equation with a potential barrier.…
Nonequilibrium Quantum Dynamics of Second Order Phase Transitions
Sang Pyo Kim, Chul H. Lee
We use the so-called Liouville-von Neumann (LvN) approach to study the nonequilibrium quantum dynamics of time-dependent second order phase transitions. The LvN approach is a canon…
Black Hole Decay and Quantum Instantons
Donsu 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…