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Generalised tensor fluctuations and inflation

Gianmassimo Tasinato Orcid Logo, Dario Cannone, David Wands

Journal of Cosmology and Astroparticle Physics, Volume: 2015, Issue: 01, Start page: 029

Swansea University Author: Gianmassimo Tasinato Orcid Logo

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DOI (Published version): 10.1088/1475-7516/2015/01/029

Abstract

Using an effective field theory approach to inflation, we examine novel properties of the spectrum of inflationary tensor fluctuations, that arise when breaking some of the symmetries or requirements usually imposed on the dynamics of perturbations. During single-clock inflation, time-reparameteriza...

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Published in: Journal of Cosmology and Astroparticle Physics
Published: 2015
URI: https://cronfa.swan.ac.uk/Record/cronfa21707
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first_indexed 2015-05-27T02:10:56Z
last_indexed 2018-02-09T04:59:31Z
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spelling 2017-05-23T19:23:30.1432489 v2 21707 2015-05-26 Generalised tensor fluctuations and inflation cb754b073d1e4949c5e3db97744d3301 0000-0002-9835-4864 Gianmassimo Tasinato Gianmassimo Tasinato true false 2015-05-26 SPH Using an effective field theory approach to inflation, we examine novel properties of the spectrum of inflationary tensor fluctuations, that arise when breaking some of the symmetries or requirements usually imposed on the dynamics of perturbations. During single-clock inflation, time-reparameterization invariance is broken by a time-dependent cosmological background. In order to explore more general scenarios, we consider the possibility that spatial diffeomorphism invariance is also broken by effective mass terms or by derivative operators for the metric fluctuations in the Lagrangian. We investigate the cosmological consequences of the breaking of spatial diffeomorphisms, focussing on operators that affect the power spectrum of fluctuations. We identify the operators for tensor fluctuations that can provide a blue spectrum without violating the null energy condition, and operators for scalar fluctuations that lead to non-conservation of the comoving curvature perturbation on superhorizon scales even in single-clock inflation. In the last part of our work, we also examine the consequences of operators containing more than two spatial derivatives, discussing how they affect the sound speed of tensor fluctuations, and showing that they can mimic some of the interesting effects of symmetry breaking operators, even in scenarios that preserve spatial diffeomorphism invariance. Journal Article Journal of Cosmology and Astroparticle Physics 2015 01 029 31 12 2015 2015-12-31 10.1088/1475-7516/2015/01/029 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2017-05-23T19:23:30.1432489 2015-05-26T14:59:39.5155071 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Gianmassimo Tasinato 0000-0002-9835-4864 1 Dario Cannone 2 David Wands 3
title Generalised tensor fluctuations and inflation
spellingShingle Generalised tensor fluctuations and inflation
Gianmassimo Tasinato
title_short Generalised tensor fluctuations and inflation
title_full Generalised tensor fluctuations and inflation
title_fullStr Generalised tensor fluctuations and inflation
title_full_unstemmed Generalised tensor fluctuations and inflation
title_sort Generalised tensor fluctuations and inflation
author_id_str_mv cb754b073d1e4949c5e3db97744d3301
author_id_fullname_str_mv cb754b073d1e4949c5e3db97744d3301_***_Gianmassimo Tasinato
author Gianmassimo Tasinato
author2 Gianmassimo Tasinato
Dario Cannone
David Wands
format Journal article
container_title Journal of Cosmology and Astroparticle Physics
container_volume 2015
container_issue 01
container_start_page 029
publishDate 2015
institution Swansea University
doi_str_mv 10.1088/1475-7516/2015/01/029
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 0
active_str 0
description Using an effective field theory approach to inflation, we examine novel properties of the spectrum of inflationary tensor fluctuations, that arise when breaking some of the symmetries or requirements usually imposed on the dynamics of perturbations. During single-clock inflation, time-reparameterization invariance is broken by a time-dependent cosmological background. In order to explore more general scenarios, we consider the possibility that spatial diffeomorphism invariance is also broken by effective mass terms or by derivative operators for the metric fluctuations in the Lagrangian. We investigate the cosmological consequences of the breaking of spatial diffeomorphisms, focussing on operators that affect the power spectrum of fluctuations. We identify the operators for tensor fluctuations that can provide a blue spectrum without violating the null energy condition, and operators for scalar fluctuations that lead to non-conservation of the comoving curvature perturbation on superhorizon scales even in single-clock inflation. In the last part of our work, we also examine the consequences of operators containing more than two spatial derivatives, discussing how they affect the sound speed of tensor fluctuations, and showing that they can mimic some of the interesting effects of symmetry breaking operators, even in scenarios that preserve spatial diffeomorphism invariance.
published_date 2015-12-31T03:25:48Z
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score 11.035634

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