1. Inflationary magnetogenesis with added helicity: constraints from non-gaussianities
- Author
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Lorenzo Sorbo, Chiara Caprini, Maria Chiara Guzzetti, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), AstroParticule et Cosmologie ( APC - UMR 7164 ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, and PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)
- Subjects
scale: inflation ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Physics and Astronomy (miscellaneous) ,[ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph] ,Scalar (mathematics) ,FOS: Physical sciences ,magnetic field ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,Theoretical physics ,General Relativity and Quantum Cosmology ,High Energy Physics - Phenomenology (hep-ph) ,Non-Gaussianity ,0103 physical sciences ,strong coupling ,spectrum: scalar ,010306 general physics ,Physics ,Inflation (cosmology) ,Slow roll ,010308 nuclear & particles physics ,inflation: slow-roll approximation ,back reaction ,helicity ,inflation: model ,bispectrum ,High Energy Physics - Phenomenology ,[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,non-Gaussianity ,[ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,Back-reaction ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,Scalar field ,Bispectrum ,Dynamo ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
In previous work, two of us have proposed a model of inflationary magnetogenesis based on a rolling auxiliary field able both to account for the magnetic fields inferred by the (non) observation of gamma-rays from blazars, and to start the galactic dynamo, without incurring in any strong coupling or strong backreaction regime. Here we evaluate the correction to the scalar spectrum and bispectrum with respect to single-field slow-roll inflation generated in that scenario. The strongest constraints on the model originate from the non-observation of a scalar bispectrum. Nevertheless, even when those constraints are taken into consideration, the scenario can successfully account for the observed magnetic fields as long as the energy scale of inflation is smaller than $10^6\div10^8$~GeV, under some conditions on the slow roll of the auxiliary scalar field., 34 pages, 4 figures; published version, references added; changes in the requirements on the duration and velocity of the rolling of the auxiliary field; main conclusions unaffected
- Published
- 2018
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