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

Timothy Hollowood Orcid Logo, Graham Shore

Swansea University Authors: Timothy Hollowood Orcid Logo, Graham Shore

Abstract

It is now well-known that vacuum polarisation in QED can lead to super- luminal 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 refrac...

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Published: 2010
Online Access: http://arxiv.org/pdf/1006.1238
URI: https://cronfa.swan.ac.uk/Record/cronfa9216
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last_indexed 2019-10-11T19:04:40Z
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spelling 2019-10-11T15:13:02.1325804 v2 9216 2012-03-09 `Superluminal' Photon Propagation in QED in Curved Spacetime is Dispersive and Causal ea9ca59fc948276ff2ab547e91bdf0c2 0000-0002-3258-320X Timothy Hollowood Timothy Hollowood true false 28a24f55687c82d6f3ee378ead3cf234 Graham Shore Graham Shore true false 2012-03-09 SPH It is now well-known that vacuum polarisation in QED can lead to super- luminal 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 [1], 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 conclusion. Journal Article 7 6 2010 2010-06-07 http://arxiv.org/pdf/1006.1238 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2019-10-11T15:13:02.1325804 2012-03-09T18:04:05.8249602 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Timothy Hollowood 0000-0002-3258-320X 1 Graham Shore 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
Graham Shore
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
28a24f55687c82d6f3ee378ead3cf234
author_id_fullname_str_mv ea9ca59fc948276ff2ab547e91bdf0c2_***_Timothy Hollowood
28a24f55687c82d6f3ee378ead3cf234_***_Graham Shore
author Timothy Hollowood
Graham Shore
author2 Timothy Hollowood
Graham Shore
format Journal article
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://arxiv.org/pdf/1006.1238
document_store_str 0
active_str 0
description It is now well-known that vacuum polarisation in QED can lead to super- luminal 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 [1], 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 conclusion.
published_date 2010-06-07T03:11:07Z
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score 11.016235

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