Classical radiation by free-falling charges in de Sitter spacetime

Details Classical radiation by free-falling charges in de Sitter spacetime Classical radiation by free-falling charges in de Sitter spacetime

2010-06-16

arxiv.org/abs/1006.3274v2

Phys.Rev.D82:044035,2010

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

31 pages, REVTeX4, minor changes, one reference added, version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.82.044035

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.

Affiliated with

Also associated with

No associations

Rating

Classical radiation by free-falling charges in de Sitter spacetime does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Classical radiation by free-falling charges in de Sitter spacetime, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Classical radiation by free-falling charges in de Sitter spacetime will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-101048