Thermal fluctuations in viscous cosmology

Abstract

In this paper we investigate the power spectrum of thermal fluctuations in very early stage of viscous cosmology. When the state parameter as well as the viscous coefficient of a barotropic fluid is properly chosen, a scale invariant spectrum with large non-Gaussianity can be obtained. In contrast to the results previously obtained in string gas cosmology and holographic cosmology, we find the non-Gaussianity in this context can be k-independent such that it is not suppressed at large scale, which is expected to be testified in future observation.

13 pages, no figure, typos corrected, references added

References in corpus (25)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Quasi-Single Field Inflation and Non-Gaussianities
• Large non-Gaussianities with Intermediate Shapes from Quasi-Single Field Inflation
• Does Bulk Viscosity Create a Viable Unified Dark Matter Model?
• String Gas Cosmology and Structure Formation
• Viscous Ricci Dark Energy
• Non-Gaussianity in a Matter Bounce
• Non-Gaussianity beyond slow roll in multi-field inflation
• Primordial Non-Gaussianities of General Multiple Field Inflation
• Cosmological perturbations in warm inflationary models with viscous pressure
• Thermal Fluctuations and Bouncing Cosmologies
• Crossing of the w=-1 barrier in viscous modified gravity
• Primordial Trispectrum from Entropy Perturbations in Multifield DBI Model
• Modified dispersion relations and (A)dS Schwarzschild Black holes
• General Single Field Inflation with Large Positive Non-Gaussianity
• Thermal fluctuations in loop cosmology
• Primordial Non-Gaussianities from the Trispectra in Multiple Field Inflationary Models
• Holography and the scale-invariance of density fluctuations
• On Non-Gaussianities in Multi-Field Inflation (N fields): Bi- and Tri-spectra beyond Slow-Roll
• Near-Milne realization of scale-invariant fluctuations
• Thermal non-Gaussianity in holographic cosmology
• Thermal non-Gaussianity in Near-Milne universe
• Hubble Parameter in Bulk Viscous Cosmology
• Viscous gravitational aether and the cosmological constant problem
• Large non-Gaussianity generated at the end of Extended D-term Hybrid Inflation

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• Crossing the phantom divide with dissipative normal matter in the Israel-Stewart-Hiscock formalism
• Remarks on cosmological bulk viscosity in different epochs
• Cosmology with viscous generalized Chaplygin gas in $f(Q)$ gravity
• Quadra-Spectrum and Quint-Spectrum from Inflation and Curvaton Models
• Energy stored on a cosmological horizon and its thermodynamic fluctuations in holographic equipartition law
• Testing a dissipative kinetic k-essence model