37 citations · 46 across the 5 of their papers we have counts for
5 papers
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…
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,…
One-Parameter Squeezed Gaussian States of Time-Dependent Harmonic Oscillator and Selection Rule for Vacuum States
Jung Kon Kim, Sang Pyo Kim
By using the invariant method we find one-parameter squeezed Gaussian states for both time-independent and time-dependent oscillators. The squeezing parameter is expressed in terms…
Quantum Fluctuations and Particle Production of Coherently Oscillating Inflaton
Jung Kon Kim, Sang Pyo Kim
We study a massive inflaton minimally coupled to the FRW Universe using the semiclassical gravity derived from canonical quantum gravity. It is found that the semiclassical quantum…
Group Theoretical Approach to the Coherent and the Squeeze States of a Time-Dependent Harmonic Oscillator with a Singular Term
Jung Kon Kim, Sang Pyo Kim
For a time-dependent harmonic oscillator with an inverse squared singular term, we find the generalized invariant using the Lie algebra of and construct the number-type eig…