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Title: Boost breaking in the EFT of inflation

Abstract

If time-translations are spontaneously broken, so are boosts. This symmetry breaking pattern can be non-linearly realized by either just the Goldstone boson of time translations, or by four Goldstone bosons associated with time translations and boosts. In this paper we extend the Effective Field Theory of Multifield Inflation to consider the case in which the additional Goldstone bosons associated with boosts are light and coupled to the Goldstone boson of time translations. The symmetry breaking pattern forces a coupling to curvature so that the mass of the additional Goldstone bosons is predicted to be equal to √2 H in the vast majority of the parameter space where they are light. This pattern therefore offers a natural way of generating self-interacting particles with Hubble mass during inflation. After constructing the general effective Lagrangian, we study how these particles mix and interact with the curvature fluctuations, generating potentially detectable non-Gaussian signals.

Authors:
;  [1];  [2]
  1. Stanford Institute for Theoretical Physics, Stanford University, Stanford, CA 94305 (United States)
  2. Jockey Club Institute for Advanced Study, Hong Kong University of Science and Technology (Hong Kong)
Publication Date:
OSTI Identifier:
22680021
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2017; Journal Issue: 02; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COUPLING; FLUCTUATIONS; GOLDSTONE BOSONS; INFLATIONARY UNIVERSE; LAGRANGIAN FUNCTION; MASS; NONLINEAR PROBLEMS; QUANTUM FIELD THEORY; SPACE; SYMMETRY BREAKING; VISIBLE RADIATION

Citation Formats

Delacrétaz, Luca V., Senatore, Leonardo, and Noumi, Toshifumi. Boost breaking in the EFT of inflation. United States: N. p., 2017. Web. doi:10.1088/1475-7516/2017/02/034.
Delacrétaz, Luca V., Senatore, Leonardo, & Noumi, Toshifumi. Boost breaking in the EFT of inflation. United States. doi:10.1088/1475-7516/2017/02/034.
Delacrétaz, Luca V., Senatore, Leonardo, and Noumi, Toshifumi. Wed . "Boost breaking in the EFT of inflation". United States. doi:10.1088/1475-7516/2017/02/034.
@article{osti_22680021,
title = {Boost breaking in the EFT of inflation},
author = {Delacrétaz, Luca V. and Senatore, Leonardo and Noumi, Toshifumi},
abstractNote = {If time-translations are spontaneously broken, so are boosts. This symmetry breaking pattern can be non-linearly realized by either just the Goldstone boson of time translations, or by four Goldstone bosons associated with time translations and boosts. In this paper we extend the Effective Field Theory of Multifield Inflation to consider the case in which the additional Goldstone bosons associated with boosts are light and coupled to the Goldstone boson of time translations. The symmetry breaking pattern forces a coupling to curvature so that the mass of the additional Goldstone bosons is predicted to be equal to √2 H in the vast majority of the parameter space where they are light. This pattern therefore offers a natural way of generating self-interacting particles with Hubble mass during inflation. After constructing the general effective Lagrangian, we study how these particles mix and interact with the curvature fluctuations, generating potentially detectable non-Gaussian signals.},
doi = {10.1088/1475-7516/2017/02/034},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 02,
volume = 2017,
place = {United States},
year = {2017},
month = {2}
}

Works referencing / citing this record:

Cosmic Microwave Background from Effective Field Theory †
journal, June 2019