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Title: Moduli vacuum misalignment and precise predictions in string inflation

Abstract

The predictions for all the cosmological observables of any inflationary model depend on the number of e-foldings which is sensitive to the post-inflationary history of the universe. In string models the generic presence of light moduli leads to a late-time period of matter domination which lowers the required number of e-foldings and, in turn, modifies the exact predictions of any inflationary model. In this paper we compute exactly the shift of the number of e-foldings in Kähler moduli inflation which is determined by the magnitude of the moduli initial displacement caused by vacuum misalignment and the moduli decay rates. We find that the preferred number of e-foldings gets reduced from 50 to 45, causing a modification of the spectral index at the percent level. Our results illustrate the importance of understanding the full post-inflationary evolution of the universe in order to derive precise predictions in string inflation. To perform this task it is crucial to work in a setting where there is good control over moduli stabilisation.

Authors:
 [1];  [2];  [2];  [3];  [4];  [5];  [6]
  1. Dipartimento di Fisica ed Astronomia, Università di Bologna,via Irnerio 46, 40126 Bologna (Italy)
  2. (Italy)
  3. Theory Division, Saha Institute of Nuclear Physics,1/AF Salt Lake, Kolkata 700064 (India)
  4. Harish Chandra Research Intitute,Chattnag Road, Jhunsi, Allahabad 211019 (India)
  5. Abdus Salam ICTP,Strada Costiera 11, Trieste 34014 (Italy)
  6. (United Kingdom)
Publication Date:
Sponsoring Org.:
SCOAP3, CERN, Geneva (Switzerland)
OSTI Identifier:
22572127
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2016; Journal Issue: 08; Other Information: PUBLISHER-ID: JCAP08(2016)006; OAI: oai:repo.scoap3.org:16675; cc-by 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)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COSMOLOGICAL INFLATION; COSMOLOGY; INFLATIONARY UNIVERSE; MATHEMATICAL EVOLUTION; STRING MODELS; STRING THEORY; UNIVERSE

Citation Formats

Cicoli, Michele, INFN sezione di Bologna,viale Berti Pichat 6/2, 40127 Bologna, Abdus Salam ICTP,Strada Costiera 11, Trieste 34014, Dutta, Koushik, Maharana, Anshuman, Quevedo, Fernando, and DAMTP, University of Cambridge,Wilberforce Road, Cambridge, CB3 0WA. Moduli vacuum misalignment and precise predictions in string inflation. United States: N. p., 2016. Web. doi:10.1088/1475-7516/2016/08/006.
Cicoli, Michele, INFN sezione di Bologna,viale Berti Pichat 6/2, 40127 Bologna, Abdus Salam ICTP,Strada Costiera 11, Trieste 34014, Dutta, Koushik, Maharana, Anshuman, Quevedo, Fernando, & DAMTP, University of Cambridge,Wilberforce Road, Cambridge, CB3 0WA. Moduli vacuum misalignment and precise predictions in string inflation. United States. doi:10.1088/1475-7516/2016/08/006.
Cicoli, Michele, INFN sezione di Bologna,viale Berti Pichat 6/2, 40127 Bologna, Abdus Salam ICTP,Strada Costiera 11, Trieste 34014, Dutta, Koushik, Maharana, Anshuman, Quevedo, Fernando, and DAMTP, University of Cambridge,Wilberforce Road, Cambridge, CB3 0WA. Wed . "Moduli vacuum misalignment and precise predictions in string inflation". United States. doi:10.1088/1475-7516/2016/08/006.
@article{osti_22572127,
title = {Moduli vacuum misalignment and precise predictions in string inflation},
author = {Cicoli, Michele and INFN sezione di Bologna,viale Berti Pichat 6/2, 40127 Bologna and Abdus Salam ICTP,Strada Costiera 11, Trieste 34014 and Dutta, Koushik and Maharana, Anshuman and Quevedo, Fernando and DAMTP, University of Cambridge,Wilberforce Road, Cambridge, CB3 0WA},
abstractNote = {The predictions for all the cosmological observables of any inflationary model depend on the number of e-foldings which is sensitive to the post-inflationary history of the universe. In string models the generic presence of light moduli leads to a late-time period of matter domination which lowers the required number of e-foldings and, in turn, modifies the exact predictions of any inflationary model. In this paper we compute exactly the shift of the number of e-foldings in Kähler moduli inflation which is determined by the magnitude of the moduli initial displacement caused by vacuum misalignment and the moduli decay rates. We find that the preferred number of e-foldings gets reduced from 50 to 45, causing a modification of the spectral index at the percent level. Our results illustrate the importance of understanding the full post-inflationary evolution of the universe in order to derive precise predictions in string inflation. To perform this task it is crucial to work in a setting where there is good control over moduli stabilisation.},
doi = {10.1088/1475-7516/2016/08/006},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 08,
volume = 2016,
place = {United States},
year = {Wed Aug 03 00:00:00 EDT 2016},
month = {Wed Aug 03 00:00:00 EDT 2016}
}