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Effects of thermal inflation on small scale density perturbations

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Title
Effects of thermal inflation on small scale density perturbations
Author
Hong, Sungwook E.Lee, Hyung-JooLee, Young JaeStewart, Ewan D.Zoe, Heeseung
Issue Date
2015-06
Publisher
IOP PUBLISHING LTD
Citation
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, v.2015, no.6, pp.002
Abstract
In cosmological scenarios with thermal inflation, extra eras of moduli matter domination, thermal inflation and flaton matter domination exist between primordial inflation and the radiation domination of Big Bang nucleosynthesis. During these eras, cosmological perturbations on small scales can enter and re-exit the horizon, modifying the power spectrum on those scales. The largest modified scale, kb</inf>, touches the horizon size when the expansion changes from deflation to inflation at the transition from moduli domination to thermal inflation. We analytically calculate the evolution of perturbations from moduli domination through thermal inflation and evaluate the curvature perturbation on the constant radiation density hypersurface at the end of thermal inflation to determine the late time curvature perturbation. Our resulting transfer function suppresses the power spectrum by a factor 0∼ 5 at k &#34833; kb</inf>, with kb</inf> corresponding to anywhere from megaparsec to subparsec scales depending on the parameters of thermal inflation. Thus, thermal inflation might be constrained or detected by small scale observations such as CMB distortions or 21cm hydrogen line observations. &#169; 2015 IOP Publishing Ltd and Sissa Medialab srl
URI
https://scholarworks.unist.ac.kr/handle/201301/16602
URL
http://iopscience.iop.org/1475-7516/2015/06/002/
DOI
10.1088/1475-7516/2015/06/002
ISSN
1475-7516
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