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Title: Disorder in the early universe

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.

Authors:
 [1]
  1. Canadian Institute for Theoretical Astrophysics, Toronto, ON M5S 3H8 (Canada)
Publication Date:
OSTI Identifier:
22524864
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2015; Journal Issue: 03; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGICAL INFLATION; INFLATIONARY UNIVERSE; LIMITING VALUES; MAXIMUM-LIKELIHOOD FIT; NOISE; RANDOMNESS; UNIVERSE

Citation Formats

Green, Daniel, E-mail: drgreen@cita.utoronto.ca. Disorder in the early universe. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/03/020.
Green, Daniel, E-mail: drgreen@cita.utoronto.ca. Disorder in the early universe. United States. doi:10.1088/1475-7516/2015/03/020.
Green, Daniel, E-mail: drgreen@cita.utoronto.ca. Sun . "Disorder in the early universe". United States. doi:10.1088/1475-7516/2015/03/020.
@article{osti_22524864,
title = {Disorder in the early universe},
author = {Green, Daniel, E-mail: drgreen@cita.utoronto.ca},
abstractNote = {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.},
doi = {10.1088/1475-7516/2015/03/020},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 03,
volume = 2015,
place = {United States},
year = {2015},
month = {3}
}