Infrared Behavior and Gauge Artifacts in de Sitter Spacetime: The Photon Field

A. Youssef
Phys. Rev. Lett. 107, 021101 – Published 6 July 2011

Abstract

We study the infrared (long-distance) behavior of the free photon field in de Sitter spacetime. Using a two-parameter family of gauge-fixing terms, we show that the infrared (IR) behavior of the two-point function is highly gauge-dependent and ranges from vanishing to growing. This situation is in disagreement with its counterpart in flat spacetime, where the two-point function vanishes in the IR region for any choice of the gauge-fixing parameters. A criterion to isolate the physical part of the two-point function is given and is shown to lead to a well-behaved two-point function in the IR region.

  • Received 6 November 2010

DOI:https://doi.org/10.1103/PhysRevLett.107.021101

© 2011 American Physical Society

Authors & Affiliations

A. Youssef*

  • Université Paris Diderot Paris 7, Laboratoire APC, Bâtiment Condorcet, Case 7020, 75205 Paris Cedex 13, France

  • *ahmed.youssef@apc.univ-paris7.fr

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Issue

Vol. 107, Iss. 2 — 8 July 2011

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