804 citations · 3.3k across the 158 of their papers we have counts for
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Vacuum Structure of de Sitter Space
Sang Pyo Kim
In the in-/out-state formalism we find the exact one-loop effective action of a massive scalar field in the global coordinates of de Sitter spaces, which is a gravity analog of the…
Nonperturbative QED Effective Action at Finite Temperature
Sang Pyo Kim, Hyun Kyu Lee, Yongsung Yoon
We advance a novel method for the finite-temperature effective action for nonequilibrium quantum fields and find the QED effective action in time-dependent electric fields, where c…
The Stokes Phenomenon and Quantum Tunneling for de Sitter Radiation in Nonstationary Coordinates
Sang Pyo Kim
We study quantum tunneling for the de Sitter radiation in the planar coordinates and global coordinates, which are nonstationary coordinates and describe the expanding geometry. Us…
Information-Theoretic Uncertainty Relation and Random-Phase Entropy
Kyoung Kon Kim, Sang Pyo Kim, Sok Kuh Kang
Dunkel and Trigger [Phys. Rev. A {71}, 052102 (2005)] show that the Leipnik's joint entropy monotonously increases for the initially maximally classical Gaussian wave packet for a…