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Nonlinear perturbations from axion-gauge fields dynamics during inflation

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F19%3A00522515" target="_blank" >RIV/68378271:_____/19:00522515 - isvavai.cz</a>

  • Result on the web

    <a href="https://doi.org/10.1088/1475-7516/2019/07/004" target="_blank" >https://doi.org/10.1088/1475-7516/2019/07/004</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1088/1475-7516/2019/07/004" target="_blank" >10.1088/1475-7516/2019/07/004</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Nonlinear perturbations from axion-gauge fields dynamics during inflation

  • Original language description

    We study a variant of the Chromo-Natural Inflation (CNI) mechanism in which the inflaton interacts only gravitationally with the CNI fields. Integrating out all the non-dynamical scalar fields of the model results in a coupling between the perturbations of the inflaton and of the CNI pseudo-scalar which is significantly greater than the one obtained in the absence of the gauge CNI dynamics. We compute how this greater coupling impacts the power spectrum of the inflaton perturbations that are sourced nonlinearly by the unstable (tensor) gauge CNI modes, and we require that the amplitude of these modes is well below that of the linear perturbations. Combining this result with various constraints, including backreaction effects, the requirement of having observable and dominant sourced gravitational waves (GW), and the current upper bound on the tensor-to-scalar ratio, significantly constrains the range of parameter space where this model can produce an interesting GW signal.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10308 - Astronomy (including astrophysics,space science)

Result continuities

  • Project

    <a href="/en/project/EF15_003%2F0000437" target="_blank" >EF15_003/0000437: Cosmology, Gravity and the Dark Sector of the Universe</a><br>

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Others

  • Publication year

    2019

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Journal of Cosmology and Astroparticle Physics

  • ISSN

    1475-7516

  • e-ISSN

  • Volume of the periodical

    2019

  • Issue of the periodical within the volume

    7

  • Country of publishing house

    GB - UNITED KINGDOM

  • Number of pages

    39

  • Pages from-to

    1-39

  • UT code for WoS article

    000476861200004

  • EID of the result in the Scopus database

    2-s2.0-85071877510