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`Superluminal' Photon Propagation in QED in Curved Spacetime is Dispersive and Causal

Graham M. Shore, Timothy Hollowood Orcid Logo

Swansea University Author: Timothy Hollowood Orcid Logo

Abstract

It is now well-known that vacuum polarisation in QED can lead to superluminal low-frequency phase velocities for photons propagating in curved spacetimes. In a series of papers, we have shown that this quantum phenomenon is dispersive and have calculated the full frequency dependence of the refracti...

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Published: 2010
Online Access: http://inspirehep.net/record/857224
URI: https://cronfa.swan.ac.uk/Record/cronfa28520
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last_indexed 2018-02-09T05:12:44Z
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spelling 2016-06-03T14:36:09.7524225 v2 28520 2016-06-03 `Superluminal' Photon Propagation in QED in Curved Spacetime is Dispersive and Causal ea9ca59fc948276ff2ab547e91bdf0c2 0000-0002-3258-320X Timothy Hollowood Timothy Hollowood true false 2016-06-03 SPH It is now well-known that vacuum polarisation in QED can lead to superluminal low-frequency phase velocities for photons propagating in curved spacetimes. In a series of papers, we have shown that this quantum phenomenon is dispersive and have calculated the full frequency dependence of the refractive index, explaining in detail how causality is preserved and various familiar results from quantum field theory such as the Kramers-Kronig dispersion relation and the optical theorem are realised in curved spacetime. These results have been criticised in a recent paper by Akhoury and Dolgov arXiv:1003.6110 [hep-th], who assert that photon propagation is neither dispersive nor necessarily causal. In this note, we point out a series of errors in their work which have led to this false Working paper 30 6 2010 2010-06-30 http://inspirehep.net/record/857224 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2016-06-03T14:36:09.7524225 2016-06-03T14:36:09.7524225 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Graham M. Shore 1 Timothy Hollowood 0000-0002-3258-320X 2
title `Superluminal' Photon Propagation in QED in Curved Spacetime is Dispersive and Causal
spellingShingle `Superluminal' Photon Propagation in QED in Curved Spacetime is Dispersive and Causal
Timothy Hollowood
title_short `Superluminal' Photon Propagation in QED in Curved Spacetime is Dispersive and Causal
title_full `Superluminal' Photon Propagation in QED in Curved Spacetime is Dispersive and Causal
title_fullStr `Superluminal' Photon Propagation in QED in Curved Spacetime is Dispersive and Causal
title_full_unstemmed `Superluminal' Photon Propagation in QED in Curved Spacetime is Dispersive and Causal
title_sort `Superluminal' Photon Propagation in QED in Curved Spacetime is Dispersive and Causal
author_id_str_mv ea9ca59fc948276ff2ab547e91bdf0c2
author_id_fullname_str_mv ea9ca59fc948276ff2ab547e91bdf0c2_***_Timothy Hollowood
author Timothy Hollowood
author2 Graham M. Shore
Timothy Hollowood
format Working paper
publishDate 2010
institution Swansea University
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
url http://inspirehep.net/record/857224
document_store_str 0
active_str 0
description It is now well-known that vacuum polarisation in QED can lead to superluminal low-frequency phase velocities for photons propagating in curved spacetimes. In a series of papers, we have shown that this quantum phenomenon is dispersive and have calculated the full frequency dependence of the refractive index, explaining in detail how causality is preserved and various familiar results from quantum field theory such as the Kramers-Kronig dispersion relation and the optical theorem are realised in curved spacetime. These results have been criticised in a recent paper by Akhoury and Dolgov arXiv:1003.6110 [hep-th], who assert that photon propagation is neither dispersive nor necessarily causal. In this note, we point out a series of errors in their work which have led to this false
published_date 2010-06-30T03:34:43Z
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score 11.036706

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