Cosmological perturbations from statistical thermal fluctuations

Abstract

Cosmological perturbations due to statistical thermal fluctuations in a single fluid characterized by an arbitrary equation of state are computed. Formulas to predict the scalar and tensor perturbation spectra and nongaussianity parameters at a given temperature are derived. These results are relevant to any cosmological scenario where cosmic structures may have been seeded thermally instead of originating purely from quantum vacuum fluctuations.

13 pages, no figures. v2: references added

References in corpus (10)

• Reheating in Inflationary Cosmology: Theory and Applications
• Warm Inflation and its Microphysical Basis
• Non-perturbative Gravity, Hagedorn Bounce & CMB
• Thermal Fluctuations and Bouncing Cosmologies
• Inflation with a Negative Cosmological Constant
• Thermal fluctuations in loop cosmology
• Holography and the scale-invariance of density fluctuations
• Wiggles in the cosmic microwave background radiation: echoes from non-singular cyclic-inflation
• Generalised perturbation equations in bouncing cosmologies
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Cited by in corpus (18)

• Cosmological fluctuations of a random field and radiation fluid
• Multi-scale gravity and cosmology
• Closed String Thermodynamics and a Blue Tensor Spectrum
• Black hole formation in a contracting universe
• Do joint CMB and HST data support a scale invariant spectrum?
• Inflation and Alternatives with Blue Tensor Spectra
• Pre-inflationary primordial perturbations
• Note on the thermodynamics and the speed of sound of a scalar field
• String-Inspired Infinite-Derivative Theories of Gravity: A Brief Overview
• Gravitational-wave background in bouncing models from semi-classical, quantum and string gravity
• Energy stored on a cosmological horizon and its thermodynamic fluctuations in holographic equipartition law
• Phase transitions during Cyclic-Inflation and Non-gaussianity
• Self-gravitating $\Lambda$-media
• Thermal Fluctuations of Dark Matter in Bouncing Cosmology
• Perturbations in Bouncing and Cyclic Models, a General Study
• Primordial perturbations in a rainbow universe with running Newton constant
• Has inflation really solved the problems of flatness and absence of relics?
• Non-Gaussian Signatures of a Thermal Big Bang