Flat-top oscillons in an expanding universe
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Amin-2010-Flat-top oscillons i.pdf
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Author(s)
Amin, Mustafa Abdulkader
Shirokoff, David George
Date Issued
April 2010
Journal
Physical Review D
Publisher
American Physical Society
Citation
Amin, Mustafa A., and David Shirokoff. “Flat-top oscillons in an expanding universe.” Physical Review D 81.8 (2010): 085045.© 2010 The American Physical Society.
Version
Final published version
Abstract
Oscillons are extremely long lived, oscillatory, spatially localized field configurations that arise from generic initial conditions in a large number of nonlinear field theories. With an eye towards their cosmological implications, we investigate their properties in an expanding universe. We (1) provide an analytic solution for one-dimensional oscillons (for the models under consideration) and discuss their generalization to three dimensions, (2) discuss their stability against long wavelength perturbations, and (3) estimate the effects of expansion on their shapes and lifetimes. In particular, we discuss a new, extended class of oscillons with surprisingly flat tops. We show that these flat-topped oscillons are more robust against collapse instabilities in (3+1) dimensions than their usual counterparts. Unlike the solutions found in the small amplitude analysis, the width of these configurations is a nonmonotonic function of their amplitudes.
MIT Department
Massachusetts Institute of Technology. Department of Mathematics
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.81.085045
