Jul 5 – 10, 2021
Europe/Rome timezone

Does a detector detect soft photons?

Jul 9, 2021, 8:55 AM
15m
Talk in the parallel session Strong Electromagnetic and Gravitational Field Physics: From Laboratories to Early Universe Strong Electromagnetic and Gravitational Field Physics: From Laboratories to Early Universe

Speaker

Sanved Kolekar (Centre for Excellence in Basic Sciences, Mumbai)

Description

BMS supertranslation symmetries are related to both the gravitational memory effect and the Weinberg’s soft graviton theorem; the significance of which was recently realised by Hawking, Perry and Strominger (HPS) who conjectured that applying these relations to an asymptotically flat spacetime with a black hole in the interior would imply the existence of an infinite number of soft hairs for the black hole. We explore the question whether the presence of soft photons in a system can have direct or indirect consequences in the outcome of suitably defined quantum processes involving the system. We consider an local quantum detector with dual energy levels and coupled to the background gauge invariant charged scalar field in a flat spacetime. The transition rate for such a system on an inertial trajectory, for downward transitions $E<0$, is found to depend on the soft charges $Q_\epsilon$ corresponding to the radial component of the electric field dressing chosen at the asymptotic boundary. The implications are discussed.

Primary author

Sanved Kolekar (Centre for Excellence in Basic Sciences, Mumbai)

Co-author

Prof. Jorma Louko (University of Nottingham )

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Proceedings

Paper