No Cover Image

Journal article 570 views

The effect of gravitational tidal forces on renormalized quantum fields / Timothy Hollowood; Graham Shore

Journal of High Energy Physics, Volume: 2012, Issue: 2, Start page: 120

Swansea University Authors: Timothy, Hollowood, Graham, Shore

Full text not available from this repository: check for access using links below.

DOI (Published version): 10.1007/JHEP02(2012)120

Abstract

The effect of gravitational tidal forces on renormalized quantum fields propagating in curved spacetime is investigated and a generalisation of the optical the- orem to curved spacetime is proved. In the case of QED, the interaction of tidal forces with the vacuum polarization cloud of virtual e+e−...

Full description

Published in: Journal of High Energy Physics
Published: Springer-Verlag 2012
URI: https://cronfa.swan.ac.uk/Record/cronfa7967
Tags: Add Tag
No Tags, Be the first to tag this record!
Abstract: The effect of gravitational tidal forces on renormalized quantum fields propagating in curved spacetime is investigated and a generalisation of the optical the- orem to curved spacetime is proved. In the case of QED, the interaction of tidal forces with the vacuum polarization cloud of virtual e+e− pairs dressing the renormalized photon has been shown to produce several novel phenomena. In particular, the photon field amplitude can locally increase as well as decrease, corresponding to a negative imaginary part of the refractive index, in apparent violation of unitarity and the op- tical theorem. Below threshold decays into e+e− pairs may also occur. In this paper, these issues are studied from the point of view of a non-equilibrium initial-value prob- lem, with the field evolution from an initial null surface being calculated for physically distinct initial conditions and for both scalar field theories and QED. It is shown how a generalised version of the optical theorem, valid in curved spacetime, allows a local in- crease in amplitude while maintaining consistency with unitarity. The picture emerges of the field being dressed and undressed as it propagates through curved spacetime, with the local gravitational tidal forces determining the degree of dressing and hence the amplitude of the renormalized quantum field. These effects are illustrated with many examples, including a description of the undressing of a photon in the vicinity of a black hole singularity.
College: College of Science
Issue: 2
Start Page: 120