PIRSA:12110040

Primordial Magnetic Fields & Non-Gaussianity

Sloth, M. (2012). Primordial Magnetic Fields & Non-Gaussianity. Perimeter Institute. https://pirsa.org/12110040

Sloth, Martin. Primordial Magnetic Fields & Non-Gaussianity. Perimeter Institute, Nov. 06, 2012, https://pirsa.org/12110040 

          @misc{ pirsa_PIRSA:12110040,
            doi = {10.48660/12110040},
            url = {https://pirsa.org/12110040},
            author = {Sloth, Martin},
            keywords = {Cosmology},
            language = {en},
            title = {Primordial Magnetic Fields \& Non-Gaussianity},
            publisher = {Perimeter Institute},
            year = {2012},
            month = {nov},
            note = {PIRSA:12110040 see, \url{https://pirsa.org}}
          }

Martin Sloth University of Southern Denmark

DOI 10.48660/12110040
Collection
Talk Type Scientific Series
Subject

Abstract

There are indications of a lower bound on magnetic fields in the intergalactic media. Since magnetic fields on such large scales are difficult to generate in the late universe, this might point to inflationary magnetogenesis as the origin of intergalactic magnetic fields. If the magnetic fields are generated during inflation, they are naturally correlated with the inflaton perturbations in a general class of models. This leads to a consistency relation between the power spectrum of primordial magnetic fields and the non-Gaussian three-point cross-correlation of magnetic fields with the inflaton perturbation. The size of non-Gaussianity can be expressed in a new magnetic non-linearity parameter b_NL. In the flattened shape where the non-Gaussianity is maximal, b_NL can be as large as 5000.