Damping of an oscillating scalar field indirectly coupled to a thermal bath

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Title
Damping of an oscillating scalar field indirectly coupled to a thermal bath
Author(s)
Erwin H. Tanin; Ewan D. Stewart
Publication Date
2017-11
Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, v., no.11, pp.019 -
Publisher
IOP PUBLISHING LTD
Abstract
The damping process of a homogeneous oscillating scalar field that indirectly interacts with a thermal bath through a mediator field is investigated over a wide range of model parameters. We consider two types of mediator fields, those that can decay to the thermal bath and those that are individually stable but pair annihilate. The former case has been extensively studied in the literature by treating the damping as a local effect after integrating out the assumed close-to-equilibrium mediator field. The same approach does not apply if the mediator field is stable and freezes out of equilibrium. To account for the latter case, we adopt a non-local description of damping that is only meaningful when we consider full half-oscillations of the field being damped. The damping rates of the oscillating scalar field and the corresponding heating rate of the thermal bath in all bulk parameter regions are calculated in both cases, corroborating previous results in the direct decay case. Using the obtained results, the time it takes for the amplitude of the scalar field to be substantially damped is estimated (c) 2017 IOP Publishing Ltd and Sissa Medialab
URI
https://pr.ibs.re.kr/handle/8788114/4420
ISSN
1475-7516
Appears in Collections:
Center for Axion and Precision Physics Research(액시온 및 극한상호작용 연구단) > Journal Papers (저널논문)
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