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Rapid-turn inflation in supergravity is rare and tachyonic

Vikas Aragam, Roberta Chiovoloni, Sonia Paban, Robert Rosati, Ivonne Zavala Carrasco Orcid Logo

Journal of Cosmology and Astroparticle Physics, Volume: 2022, Issue: 03, Start page: 002

Swansea University Author: Ivonne Zavala Carrasco Orcid Logo

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DOI (Published version): 10.1088/1475-7516/2022/03/002

Abstract

Strongly non-geodesic, or rapidly turning trajectories in multifield inflation have attracted much interest recently from both theoretical and phenomenological perspectives. Most models with large turning rates in the literature are formulated as effective field theories. In this paper we investigat...

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Published in: Journal of Cosmology and Astroparticle Physics
ISSN: 1475-7516
Published: IOP Publishing 2022
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URI: https://cronfa.swan.ac.uk/Record/cronfa61262
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first_indexed 2022-10-13T12:58:26Z
last_indexed 2023-01-13T19:21:55Z
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spelling 2022-10-13T13:59:44.0096692 v2 61262 2022-09-17 Rapid-turn inflation in supergravity is rare and tachyonic 2fb8d4bb665e9a89d3b3478c17f646f8 0000-0002-5589-9928 Ivonne Zavala Carrasco Ivonne Zavala Carrasco true false 2022-09-17 SPH Strongly non-geodesic, or rapidly turning trajectories in multifield inflation have attracted much interest recently from both theoretical and phenomenological perspectives. Most models with large turning rates in the literature are formulated as effective field theories. In this paper we investigate rapid-turn inflation in supergravity as a first step towards understanding them in string theory. We find that large turning rates can be generated in a wide class of models, at the cost of high field space curvature. In these models, while the inflationary trajectories are stable, one Hessian eigenvalue is always tachyonic and large, in Hubble units. Thus, these models satisfy the de Sitter swampland conjecture along the inflationary trajectory. However, the high curvatures underscore the difficulty of obtaining rapid-turn inflation in realistic string-theoretical models. In passing, we revisit the η-problem in multifield slow-roll inflation and show that it does not arise, inasmuch as the inflatons, ϕi, can all be heavier (in absolute value) that the Hubble scale: |mi|/H>1, ∀i. Journal Article Journal of Cosmology and Astroparticle Physics 2022 03 002 IOP Publishing 1475-7516 inflation, string theory and cosmology, supersymmetry and cosmology 1 3 2022 2022-03-01 10.1088/1475-7516/2022/03/002 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2022-10-13T13:59:44.0096692 2022-09-17T12:52:12.7317454 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Vikas Aragam 1 Roberta Chiovoloni 2 Sonia Paban 3 Robert Rosati 4 Ivonne Zavala Carrasco 0000-0002-5589-9928 5 61262__25451__fe6ba1c073e149f8abc80797079d04e4.pdf 61262_VoR.pdf 2022-10-13T13:58:50.1231071 Output 1535048 application/pdf Version of Record true Copyright: 2022 The Author(s). Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence true eng http://creativecommons.org/licenses/by/4.0/
title Rapid-turn inflation in supergravity is rare and tachyonic
spellingShingle Rapid-turn inflation in supergravity is rare and tachyonic
Ivonne Zavala Carrasco
title_short Rapid-turn inflation in supergravity is rare and tachyonic
title_full Rapid-turn inflation in supergravity is rare and tachyonic
title_fullStr Rapid-turn inflation in supergravity is rare and tachyonic
title_full_unstemmed Rapid-turn inflation in supergravity is rare and tachyonic
title_sort Rapid-turn inflation in supergravity is rare and tachyonic
author_id_str_mv 2fb8d4bb665e9a89d3b3478c17f646f8
author_id_fullname_str_mv 2fb8d4bb665e9a89d3b3478c17f646f8_***_Ivonne Zavala Carrasco
author Ivonne Zavala Carrasco
author2 Vikas Aragam
Roberta Chiovoloni
Sonia Paban
Robert Rosati
Ivonne Zavala Carrasco
format Journal article
container_title Journal of Cosmology and Astroparticle Physics
container_volume 2022
container_issue 03
container_start_page 002
publishDate 2022
institution Swansea University
issn 1475-7516
doi_str_mv 10.1088/1475-7516/2022/03/002
publisher IOP Publishing
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 1
active_str 0
description Strongly non-geodesic, or rapidly turning trajectories in multifield inflation have attracted much interest recently from both theoretical and phenomenological perspectives. Most models with large turning rates in the literature are formulated as effective field theories. In this paper we investigate rapid-turn inflation in supergravity as a first step towards understanding them in string theory. We find that large turning rates can be generated in a wide class of models, at the cost of high field space curvature. In these models, while the inflationary trajectories are stable, one Hessian eigenvalue is always tachyonic and large, in Hubble units. Thus, these models satisfy the de Sitter swampland conjecture along the inflationary trajectory. However, the high curvatures underscore the difficulty of obtaining rapid-turn inflation in realistic string-theoretical models. In passing, we revisit the η-problem in multifield slow-roll inflation and show that it does not arise, inasmuch as the inflatons, ϕi, can all be heavier (in absolute value) that the Hubble scale: |mi|/H>1, ∀i.
published_date 2022-03-01T04:19:58Z
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score 11.013148

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