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gr-qc1998
Loss of Quantum Coherence and Positivity of Energy Density in Semiclassical Quantum Gravity
Sang Pyo Kim, Kwang-Sup Soh
In the semiclassical quantum gravity derived from the Wheeler-DeWitt equation, the energy density of a matter field loses quantum coherence due to the induced gauge potential from…
physics.optics1998
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…