Response of an Unruh-DeWitt detector near an extremal black hole

Abstract

We consider the response of an Unruh-DeWitt detector near an extremal charged black hole, modeling the near-horizon region of this extremal spacetime by the Bertotti-Robinson spacetime. The advantage of employing the Bertotti-Robinson limit is that the two-point functions for a massless scalar field are obtainable in closed form for the field in a number of quantum states of interest. We consider the detector coupled to a massless field in both the Boulware vacuum state and arbitrary thermal states, including the Hartle-Hawking state, and analyse the detector's response for a broad range of trajectories. Particular attention is paid to the thermalization of the detector, the anti-Unruh and anti-Hawking effect.

21 pages, 26 figures

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Cited by in corpus (3)

• Harvesting mutual information from BTZ black hole spacetime
• Unruh-DeWitt detectors in cosmological spacetimes
• Quantum kicks near a Cauchy horizon