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Infrared behavior and gauge artifacts in de Sitter spacetime. I. The photon field
Youssef A.
Physical Review Letters 107, 2 (2011) 021101 - http://hal.archives-ouvertes.fr/hal-00534911
Physique/Physique des Hautes Energies - Théorie
Physique/Relativité Générale et Cosmologie Quantique
Infrared behavior and gauge artifacts in de Sitter spacetime. I. The photon field
A. Youssef ()1
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
http://www.apc.univ-paris7.fr/
CNRS : UMR7164 – IN2P3 – Observatoire de Paris – Université Paris VII - Paris Diderot – CEA : DSM/IRFU
APC - UMR 7164, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, case postale 7020, F-75205 Paris Cedex 13
France
APC - THEORIE
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 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.
Anglais
10/11/2010

Physical Review Letters (Phys. Rev. Lett.)
Publisher American Physical Society
ISSN 0031-9007 (eISSN : 1079-7114)
internationale
Articles dans des revues avec comité de lecture
2011
107
2
021101

Quantum field theory in curved spacetime – de Sitter – Infrared effects
04.62.+v

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