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  How attractive is the isotropic attractor solution of axion-SU(2) inflation?

Wolfson, I., Maleknejad, A., & Komatsu, E. (2020). How attractive is the isotropic attractor solution of axion-SU(2) inflation? Journal of Cosmology and Astroparticle Physics, 2020(9): 047. doi:10.1088/1475-7516/2020/09/047.

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How attractive is the isotropic attractor solution of axion-SU(2) inflation.pdf (Any fulltext), 7MB
 
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Wolfson, Ira1, Author              
Maleknejad, Azadeh1, Author              
Komatsu, Eiichiro1, Author              
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1Physical Cosmology, MPI for Astrophysics, Max Planck Society, ou_2205644              

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 Abstract: The key to the phenomenological success of inflation models with axion and SU(2) gauge fields is the isotropic background of the SU(2) field. Previous studies showed that this isotropic background is an attractor solution during inflation starting from anisotropic (Bianchi type I) spacetime; however, not all possible initial anisotropic parameter space was explored. In this paper, we explore more generic initial conditions without assuming the initial slow-roll dynamics. We find some initial anisotropic parameter space which does not lead to the isotropic background, but to violation of slow-roll conditions, terminating inflation prematurely. The basin of attraction increases when we introduce another scalar field acting as inflaton and make the axion-SU(2) system a spectator sector. Therefore, the spectator axion-SU(2) model is phenomenologically more attractive.

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Language(s): eng - English
 Dates: 2020-11-24
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1088/1475-7516/2020/09/047
Other: LOCALID: 3283018
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Title: Journal of Cosmology and Astroparticle Physics
  Abbreviation : J. Cosmol. Astropart. Phys.
  Abbreviation : JCAP
Source Genre: Journal
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Pages: - Volume / Issue: 2020 (9) Sequence Number: 047 Start / End Page: - Identifier: ISSN: 1475-7516