Quantum origin of the primordial fluctuation spectrum and its statistics

Abstract

The usual account for the origin of cosmic structure during inflation is not fully satisfactory, as it lacks a physical mechanism capable of generating the inhomogeneity and anisotropy of our Universe, from an exactly homogeneous and isotropic initial state associated with the early inflationary regime. The proposal in [A. Perez, H. Sahlmann, and D. Sudarsky, Classical Quantum Gravity, 23, 2317, (2006)] considers the spontaneous dynamical collapse of the wave function, as a possible answer to that problem. In this work, we review briefly the difficulties facing the standard approach, as well as the answers provided by the above proposal and explore their relevance to the investigations concerning the characterization of the primordial spectrum and other statistical aspects of the cosmic microwave background and large-scale matter distribution. We will see that the new approach leads to novel ways of considering some of the relevant questions, and, in particular, to distinct characterizations of the non-Gaussianities that might have left imprints on the available data.

27 pages. Revision to match the published version

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Cited by in corpus (35)

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• Relativistic collapse dynamics and black hole information loss
• Less Decoherence and More Coherence in Quantum Gravity, Inflationary Cosmology and Elsewhere
• The collapse of the wave function in the joint metric-matter quantization for inflation
• Black Holes: Information Loss But No Paradox
• Emergence of inflationary perturbations in the CSL model
• Expectation of primordial gravity waves generated during inflation
• A Non-static Quantum inspired Spacetime in $f(R)$ Gravity: Gravity's Rainbow
• Origin of structure: Statistical characterization of the primordial density fluctuations and the collapse of the wave function
• Constraining quantum collapse inflationary models with CMB data
• Constraining quantum collapse inflationary models with current data: The semiclassical approach
• Primordial gravitational waves and the collapse of the wave function
• Inflation including collapse of the wave function: The quasi-de Sitter case
• Finding origins of CMB anomalies in the inflationary quantum fluctuations
• Inhomogeneities from quantum collapse scheme without inflation
• Semiclassical Self Consistent Treatment of the Emergence of Seeds of Cosmic Structure. The second order construction
• Eternal inflation and the quantum birth of cosmic structure
• Quasi-matter bounce and inflation in the light of the CSL model
• Inflationary gravitational waves in collapse scheme models
• A (not so?) novel explanation for the very special initial state of the universe
• Novel Possibility of Nonstandard Statistics in the Inflationary Spectrum of Primordial Inhomogeneities
• Quantum collapse as source of the seeds of cosmic structure during the radiation era
• Enlightening the CSL model landscape in inflation
• A dialog on the fate of information in black hole evaporation
• Reconstruction of inflationary scenarios in non-conservative unimodular gravity
• On signatures of spontaneous collapse dynamics modified single field inflation
• Emergent universe: tensor perturbations within the CSL framework
• Emergent universe revisited through the CSL theory
• Novel vacuum conditions in inflationary collapse models
• Observational constraints on inflationary potentials within the quantum collapse framework
• Revisiting astrophysical bounds on continuous spontaneous localization models
• Observational constraints on the second-order primordial power spectrum: Exploring a Continuous Spontaneous Localization inspired inflationary model
• The `unitarity problem' of Higgs inflation in the light of collapse dynamics