Mass density perturbations from inflation with thermal dissipation

Wo-Lung Lee, Li Zhi Fang

Research output: Contribution to journalArticle

Abstract

We study the power spectrum of the mass density perturbations in an inflation scenario that includes thermal dissipation. We show that the condition on which the thermal fluctuations dominate the primordial density perturbations can easily be realized even for weak dissipation, i.e., the rate of dissipation is less than the Hubble expansion. We find that our spectrum of primordial density perturbations follows a power law behavior, and exhibits a "thermodynamical" feature - the amplitude and power index of the spectrum depend mainly on the thermodynamical variable M, the inflation energy scale. Comparing this result with the observed temperature fluctuations of the cosmic microwave background, we find that both amplitude and index of the power spectrum can be fairly well fitted if M ∼ 1015-1016 GeV.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume59
Issue number8
Publication statusPublished - 1999 Apr 15

Fingerprint

dissipation
perturbation
power spectra
microwaves
expansion
temperature
energy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Mass density perturbations from inflation with thermal dissipation. / Lee, Wo-Lung; Fang, Li Zhi.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 59, No. 8, 15.04.1999, p. 1-10.

Research output: Contribution to journalArticle

@article{526cada7107e4e3cbd11da92cda6f31d,
title = "Mass density perturbations from inflation with thermal dissipation",
abstract = "We study the power spectrum of the mass density perturbations in an inflation scenario that includes thermal dissipation. We show that the condition on which the thermal fluctuations dominate the primordial density perturbations can easily be realized even for weak dissipation, i.e., the rate of dissipation is less than the Hubble expansion. We find that our spectrum of primordial density perturbations follows a power law behavior, and exhibits a {"}thermodynamical{"} feature - the amplitude and power index of the spectrum depend mainly on the thermodynamical variable M, the inflation energy scale. Comparing this result with the observed temperature fluctuations of the cosmic microwave background, we find that both amplitude and index of the power spectrum can be fairly well fitted if M ∼ 1015-1016 GeV.",
author = "Wo-Lung Lee and Fang, {Li Zhi}",
year = "1999",
month = "4",
day = "15",
language = "English",
volume = "59",
pages = "1--10",
journal = "Physical review D: Particles and fields",
issn = "0556-2821",
publisher = "American Institute of Physics",
number = "8",

}

TY - JOUR

T1 - Mass density perturbations from inflation with thermal dissipation

AU - Lee, Wo-Lung

AU - Fang, Li Zhi

PY - 1999/4/15

Y1 - 1999/4/15

N2 - We study the power spectrum of the mass density perturbations in an inflation scenario that includes thermal dissipation. We show that the condition on which the thermal fluctuations dominate the primordial density perturbations can easily be realized even for weak dissipation, i.e., the rate of dissipation is less than the Hubble expansion. We find that our spectrum of primordial density perturbations follows a power law behavior, and exhibits a "thermodynamical" feature - the amplitude and power index of the spectrum depend mainly on the thermodynamical variable M, the inflation energy scale. Comparing this result with the observed temperature fluctuations of the cosmic microwave background, we find that both amplitude and index of the power spectrum can be fairly well fitted if M ∼ 1015-1016 GeV.

AB - We study the power spectrum of the mass density perturbations in an inflation scenario that includes thermal dissipation. We show that the condition on which the thermal fluctuations dominate the primordial density perturbations can easily be realized even for weak dissipation, i.e., the rate of dissipation is less than the Hubble expansion. We find that our spectrum of primordial density perturbations follows a power law behavior, and exhibits a "thermodynamical" feature - the amplitude and power index of the spectrum depend mainly on the thermodynamical variable M, the inflation energy scale. Comparing this result with the observed temperature fluctuations of the cosmic microwave background, we find that both amplitude and index of the power spectrum can be fairly well fitted if M ∼ 1015-1016 GeV.

UR - http://www.scopus.com/inward/record.url?scp=17144388264&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=17144388264&partnerID=8YFLogxK

M3 - Article

VL - 59

SP - 1

EP - 10

JO - Physical review D: Particles and fields

JF - Physical review D: Particles and fields

SN - 0556-2821

IS - 8

ER -