Infrared behavior and gauge artifacts in de Sitter spacetime. I. The photon field

A. Youssef 1
1 APC - THEORIE
APC - UMR 7164 - AstroParticule et Cosmologie, Institut für theoretische Physik
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 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.
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Physical Review Letters, American Physical Society, 2011, 107 (2), pp.021101. 〈10.1103/PhysRevLett.107.021101〉
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A. Youssef. Infrared behavior and gauge artifacts in de Sitter spacetime. I. The photon field. Physical Review Letters, American Physical Society, 2011, 107 (2), pp.021101. 〈10.1103/PhysRevLett.107.021101〉. 〈hal-00534911〉

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