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

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.

arXiv comment4 pages, published version

References in corpus (5)

• Decay of Vacuum Energy
• The IR stability of de Sitter: Loop corrections to scalar propagators
• Cosmological Dark Energy: Prospects for a Dynamical Theory
• Scalar tachyons in the de Sitter universe
• Gauge fixing in higher derivative field theories

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• Large-distance behaviour of the massless vector two-point function in de Sitter spacetime
• Photon propagator for inflation in the general covariant gauge
• Photon quantization in cosmological spaces
• Gauge dependence in QED amplitudes in expanding de Sitter space
• Regularized stress tensor of vector fields in de Sitter space
• Electromagnetic vacuum stresses and energy fluxes induced by a cosmic string in de Sitter spacetime