Infrared propagator corrections for constant deceleration

T. M. Janssen, S. P. Miao, T. Prokopec, R. P. Woodard

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

We derive the propagator for a massless, minimally coupled scalar on a D-dimensional, spatially flat, homogeneous and isotropic background with arbitrary constant deceleration parameter. Our construction uses the operator formalism by integrating the Fourier mode sum. We give special attention to infrared corrections from the nonzero lower limit associated with working on finite spatial sections. These corrections eliminate infrared divergences that would otherwise be incorrectly treated by dimensional regularization, resulting in off-coincidence divergences for those special values of the deceleration parameter at which the infrared divergence is logarithmic. As an application we compute the expectation value of the scalar stress-energy tensor.

Original languageEnglish
Article number245013
JournalClassical and Quantum Gravity
Volume25
Issue number24
DOIs
Publication statusPublished - 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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