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  Classical radiation by free-falling charges in de Sitter spacetime

Akhmedov, E. T., Roura, A., & Sadofyev, A. (2010). Classical radiation by free-falling charges in de Sitter spacetime. Physical Review D., 82: 044035. doi:10.1103/PhysRevD.82.044035.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-BD46-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-BD4A-5
Genre: Journal Article

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Akhmedov, E. T.1, Author              
Roura, A.1, Author              
Sadofyev, A., Author
Affiliations:
1Quantum Gravity and Unified Theories, AEI Golm, MPI for Gravitational Physics, Max Planck Society, escidoc:24014              

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 Abstract: We study the classical radiation emitted by free-falling charges in de Sitter spacetime coupled to different kinds of fields. Specifically we consider the cases of the electromagnetic field, linearized gravity and scalar fields with arbitrary mass and curvature coupling. Given an arbitrary set of such charges, there is a generic result for sufficiently late times which corresponds to each charge being surrounded by a field zone with negligible influence from the other charges. Furthermore, we explicitly find a static solution in the static patch adapted to a charge (implying no energy loss by the charge) which can be regularly extended beyond the horizon to the full de Sitter spacetime, and show that any other solution decays at late times to this one. On the other hand, for non-conformal scalar fields the inertial observers naturally associated with spatially flat coordinates will see a non-vanishing flux far from the horizon, which will fall off more slowly than the inverse square of the distance for sufficiently light fields (m^2 + \xi R < 5H^2/4) and give rise to a total integrated flux that grows unboundedly with the radius. This can be qualitatively interpreted as a consequence of a classical parametric amplification of the field generated by the charge due to the time-dependent background spacetime. Most of these results do not hold for massless minimally coupled scalar fields, whose special behavior is analyzed separately.

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 Dates: 2010-06-162010
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: arXiv: 1006.3274
DOI: 10.1103/PhysRevD.82.044035
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Title: Physical Review D.
  Other : Phys. Rev. D.
Source Genre: Journal
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Publ. Info: Lancaster, Pa. : Published for the American Physical Society by the American Institute of Physics
Pages: 18 Volume / Issue: 82 Sequence Number: 044035 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/111088197762258