The vacuum-persistence probability for a quantum field in a weak gravitational background is computed to second order in curvatures in D dimensions; conformal fields in conformally flat spacetimes do not create particles at this order.
Quantum Hair During Gravitational Collapse
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We consider quantum gravitational corrections to the Oppenheimer-Snyder metric describing time-dependent dust ball collapse. The interior metric also describes Friedmann-Lemaitre-Robertson-Walker cosmology and our results are interpreted in that context. The exterior corrections are an example of quantum hair, and are shown to persist throughout the collapse. Our results show the quantum hair survives throughout the horizon formation and that the internal state of the resulting black hole is accessible to outside observers.
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Nonlocal effective action and particle creation in $D$ dimensions
The vacuum-persistence probability for a quantum field in a weak gravitational background is computed to second order in curvatures in D dimensions; conformal fields in conformally flat spacetimes do not create particles at this order.