Disorder in the Early Universe

TL;DR

This paper explores the concept of disorder in the early universe's inflationary phase, developing a formalism to understand its effects and potential observational signatures like additional noise in cosmological spectra.

Contribution

It introduces a novel formalism for disorder in inflation and connects it to observable consequences, providing a new perspective on the microphysics of the early universe.

Findings

Disorder can produce additional noise in the power spectrum and bispectrum.

A formalism relating disorder to a modulating field is developed.

Preliminary constraints on disorder are possible with existing data.

Abstract

Little is known about the microscopic physics that gave rise to inflation in our universe. There are many reasons to wonder if the underlying description requires a careful arrangement of ingredients or if inflation was the result of an essentially random process. At a technical level, randomness in the microphysics of inflation is closely related to disorder in solids. We develop the formalism of disorder for inflation and investigate the observational consequences of quenched disorder. We find that a common prediction is the presence of additional noise in the power spectrum or bispectrum. At a phenomenological level, these results can be recast in terms of a modulating field, allowing us to write the quadratic maximum likelihood estimator for this noise. Preliminary constraints on disorder can be derived from existing analyses but significant improvements should be possible with a dedicated treatment.