Inflationary magnetogenesis with added helicity: constraints from non-Gaussianities. (English) Zbl 1391.85003
Summary: In previous work [C. Caprini and L. Sorbo, J. Cosmol. Astropart. Phys. 2014, No. 10, Article ID 056, 16 p. (2014; doi:10.1088/1475-7516/2014/10/056)] 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 \(10^6\div 10^8\) GeV, under some conditions on the slow roll of the auxiliary scalar field.
MSC:
| 85A40 | Astrophysical cosmology |
| 76W05 | Magnetohydrodynamics and electrohydrodynamics |
| 62P35 | Applications of statistics to physics |
| 83F05 | Relativistic cosmology |
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