On Coarse-grained Entropy and Stimulated Emission in Curved Space-Time
Esko Keski-Vakkuri
Abstract
We study the entropy generation and particle production in scalar quantum field theory in expanding spacetimes with many-particle mixed initial states. The recently proposed coarse-grained entropy approach by Brandenberger et. al. is applied to systems which may have a non-zero initial entropy. We find that although the the particle production is amplified as a result of boson statistics, the (coarse-grained) entropy generation is attenuated when initial particles are present.
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