Near-Milne realization of scale-invariant fluctuations

Abstract

A near-Milne Universe produces a very red spectrum of vacuum quantum fluctuations, but has the potential to produce near-scale invariant {\it thermal} fluctuations. This happens if the energy and entropy are mildly sub-extensive, for example if there is a Casimir contribution. Therefore, one does not need to invoke corrections to Einstein gravity (as in loop quantum cosmology) for a thermal scenario to be viable. Neither do we need the energy to scale like the area, as in scenarios where the thermal fluctuations are subject to a phase transition in the early Universe. Some odd features of this model are pointed out: whether they are fatal or merely unusual should be the subject of future investigations.

References in corpus (15)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Information criteria for astrophysical model selection
• Producing a Scale-Invariant Spectrum of Perturbations in a Hagedorn Phase of String Cosmology
• The Glass-like Universe: Real-space correlation properties of standard cosmological models
• Phantom thermodynamics
• Non-Commutative Inflation
• Scale-invariance in expanding and contracting universes from two-field models
• More on the Spectrum of Perturbations in String Gas Cosmology
• Thermal fluctuations in loop cosmology
• Could thermal fluctuations seed cosmic structure?
• A Note on the Cardy-Verlinde Formula
• Occam's razor meets WMAP
• Holography and the scale-invariance of density fluctuations
• Cosmological Perturbations in Non-Commutative Inflation
• On the origin of the large scale structures of the universe

Cited by in corpus (9)

• Cosmological fluctuations of a random field and radiation fluid
• Cosmic Information, the Cosmological Constant and the Amplitude of primordial perturbations
• Cosmological perturbations from statistical thermal fluctuations
• Thermodynamics of String Field Theory Motivated Nonlocal Models
• Observing the temperature of the Big Bang through large scale structure
• Thermal fluctuations in viscous cosmology
• Thermal non-Gaussianity in holographic cosmology
• Self-gravitating $\Lambda$-media
• Thermal non-Gaussianity in Near-Milne universe