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Effects of thermal inflation on small scale density perturbations

Title
Effects of thermal inflation on small scale density perturbations
Authors
Hong, SE[Hong, Sungwook E.]Lee, HJ[Lee, Hyung-Joo]Lee, YJ[Lee, Young Jae]Stewart, ED[Stewart, Ewan D.]Zoe, H[Zoe, Heeseung]
DGIST Authors
Zoe, H[Zoe, Heeseung]
Issue Date
2015-06
Citation
Journal of Cosmology and Astroparticle Physics(6)
Type
Article
Article Type
Article
Keywords
Cosmological Perturbation TheoryInflationPhysics of the Early UniverseSupersymmetry and Cosmology
ISSN
1475-7516
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, 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 蠑 kb, with kb 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. © 2015 IOP Publishing Ltd and Sissa Medialab srl .
URI
http://hdl.handle.net/20.500.11750/2896
DOI
10.1088/1475-7516/2015/06/002
Publisher
Institute of Physics Publishing
Files:
There are no files associated with this item.
Collection:
School of Undergraduate Studies1. Journal Articles


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