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Title: Breaking of spatial diffeomorphism invariance, inflation and the spectrum of cosmological perturbations

Abstract

Standard inflationary models yield a characteristic signature of a primordial power spectrum with a red tensor and scalar tilt. Nevertheless, Cannone et al. [1] recently suggested that, by breaking the assumption of spatial diffeomorphism invariance in the context of the effective field theory of inflation, a blue tensor spectrum can be achieved without violating the Null Energy Condition. In this context, we explore in which cases the inflationary model of [2] can yield a blue tilt of the tensor modes along with a red tilt in the scalar spectrum. Ultimately, we analyze under which conditions the model of [3] can reproduce the specific consistency relation of String Gas Cosmology.

Authors:
;  [1]
  1. Department of Physics, McGill University, 3600 rue University, Montréal, QC, H3A 2T8 (Canada)
Publication Date:
OSTI Identifier:
22525293
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2015; Journal Issue: 10; 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; COSMOLOGY; DISTURBANCES; ENERGY SPECTRA; FIELD THEORIES; INFLATIONARY UNIVERSE; SCALARS; TENSORS

Citation Formats

Graef, L.L., and Brandenberger, R., E-mail: leilagraef@usp.br, E-mail: rhb@physics.mcgill.ca. Breaking of spatial diffeomorphism invariance, inflation and the spectrum of cosmological perturbations. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/10/009.
Graef, L.L., & Brandenberger, R., E-mail: leilagraef@usp.br, E-mail: rhb@physics.mcgill.ca. Breaking of spatial diffeomorphism invariance, inflation and the spectrum of cosmological perturbations. United States. doi:10.1088/1475-7516/2015/10/009.
Graef, L.L., and Brandenberger, R., E-mail: leilagraef@usp.br, E-mail: rhb@physics.mcgill.ca. Thu . "Breaking of spatial diffeomorphism invariance, inflation and the spectrum of cosmological perturbations". United States. doi:10.1088/1475-7516/2015/10/009.
@article{osti_22525293,
title = {Breaking of spatial diffeomorphism invariance, inflation and the spectrum of cosmological perturbations},
author = {Graef, L.L. and Brandenberger, R., E-mail: leilagraef@usp.br, E-mail: rhb@physics.mcgill.ca},
abstractNote = {Standard inflationary models yield a characteristic signature of a primordial power spectrum with a red tensor and scalar tilt. Nevertheless, Cannone et al. [1] recently suggested that, by breaking the assumption of spatial diffeomorphism invariance in the context of the effective field theory of inflation, a blue tensor spectrum can be achieved without violating the Null Energy Condition. In this context, we explore in which cases the inflationary model of [2] can yield a blue tilt of the tensor modes along with a red tilt in the scalar spectrum. Ultimately, we analyze under which conditions the model of [3] can reproduce the specific consistency relation of String Gas Cosmology.},
doi = {10.1088/1475-7516/2015/10/009},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 10,
volume = 2015,
place = {United States},
year = {2015},
month = {10}
}