Quantum Decoherence in a Four-Dimensional Black Hole Background
arXiv:gr-qc/9602011 · doi:10.1142/S0217732397000248
Abstract
We display a logarithmic divergence in the density matrix of a scalar field in the presence of an Einstein-Yang-Mills black hole in four dimensions. This divergence is related to a previously-found logarithmic divergence in the entropy of the scalar field, which cannot be absorbed into a renormalization of the Hawking-Bekenstein entropy of the black hole. As the latter decays, the logarithmic divergence induces a non-commutator term $\nd{δH}ρ$ in the quantum Liouville equation for the density matrix of the scalar field, leading to quantum decoherence. The order of magnitude of $\nd{δH}$ is , where is the mass of the scalar particle.
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