Abstract:
We use the brick-wall model to study the quantum entropy of the Dirac field
in a static black hole with a global monopole or a cosmic string. We show
that the entropy of the Dirac field contains a quadratically divergent term
and two logarithmically divergent ones and it is not proportional to the entropy
of the scalar field. The contribution of the logarithmic term to
the entropy depends on the black-hole characteristics and is always negative.
Keywords:quantum entropy, Dirac field, brick-wall model, black hole.
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