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

Details Infrared behavior and gauge artifacts in de Sitter spacetime: The photon field Infrared behavior and gauge artifacts in de Sitter spacetime: The photon field

2010-11-16

arxiv.org/abs/1011.3755v3

Phys.Rev.Lett.107:021101,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, published version

Scientific paper

10.1103/PhysRevLett.107.021101

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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