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A little excitement across the horizon

Ng, Keith K.; Zhang, Chen; Louko, Jorma; Mann, Robert B.

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Keith K. Ng

Chen Zhang

Professor of Mathematical Physics

Robert B. Mann


We analyse numerically the transitions in an Unruh-DeWitt detector, coupled linearly to a massless scalar field, in radial infall in (3 + 1)-dimensional Schwarzschild spacetime. In the Hartle-Hawking and Unruh states, the transition probability attains a small local extremum near the horizon-crossing and is then moderately enhanced on approaching the singularity. In the Boulware state, the transition probability drops on approaching the horizon. The unexpected near-horizon extremum arises numerically from angular momentum superpositions, with a deeper physical explanation to be found.

Journal Article Type Article
Acceptance Date Sep 27, 2022
Online Publication Date Oct 21, 2022
Publication Date Oct 1, 2022
Deposit Date Oct 26, 2022
Publicly Available Date Oct 26, 2022
Journal New Journal of Physics
Electronic ISSN 1367-2630
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 24
Issue 10
Article Number 103018
Keywords General Physics and Astronomy
Public URL
Publisher URL


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