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Title: Breaking discrete symmetries in the effective field theory of inflation

We study the phenomenon of discrete symmetry breaking during the inflationary epoch, using a model-independent approach based on the effective field theory of inflation. We work in a context where both time reparameterization symmetry and spatial diffeomorphism invariance can be broken during inflation. We determine the leading derivative operators in the quadratic action for fluctuations that break parity and time-reversal. Within suitable approximations, we study their consequences for the dynamics of linearized fluctuations. Both in the scalar and tensor sectors, we show that such operators can lead to new direction-dependent phases for the modes involved. They do not affect the power spectra, but can have consequences for higher correlation functions. Moreover, a small quadrupole contribution to the sound speed can be generated.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Dipartimento di Fisica e Astronomia “G. Galilei”, Università degli Studi di Padova,Padova, I-35131 (Italy)
  2. (Italy)
  3. Asia Pacific Center for Theoretical Physics,Pohang, 790-784 (Korea, Republic of)
  4. (Korea, Republic of)
  5. Department of Physics, Swansea University,Swansea, SA2 8PP (United Kingdom)
Publication Date:
OSTI Identifier:
22458358
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 08; Other Information: PUBLISHER-ID: JCAP08(2015)003; OAI: oai:repo.scoap3.org:11320; Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA)
Sponsoring Org:
SCOAP3, CERN, Geneva (Switzerland)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; APPROXIMATIONS; CORRELATION FUNCTIONS; COSMOLOGICAL INFLATION; FIELD THEORIES; FLUCTUATIONS; PARITY; SCALARS; SOUND WAVES; SPECTRA; SYMMETRY BREAKING; TENSORS; UNIVERSE