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Intergalactic magnetic field spectra from diffuse gamma rays

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arxiv 1412.3171 v1 pith:LURK75Z4 submitted 2014-12-10 astro-ph.CO astro-ph.HEhep-phhep-th

Wenlei Chen , Borun D. Chowdhury , Francesc Ferrer , Hiroyuki Tashiro , Tanmay Vachaspati This is my paper · ORCID
classification astro-ph.COastro-ph.HEhep-phhep-th
keywords magneticcorrelatorsfermi-latfieldgammaintergalacticparity-oddtashiro
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Non-vanishing parity-odd correlators of gamma ray arrival directions observed by Fermi-LAT indicate the existence of a helical intergalactic magnetic field (Tashiro et al.2013). We successfully test this hypothesis using more stringent cuts of the data, Monte Carlo simulations with Fermi-LAT time exposure information, separate analyses for the northern and southern galactic hemispheres, and confirm predictions made in Tashiro & Vachaspati (2014). With some further technical assumptions, we show how to reconstruct the magnetic helicity spectrum from the parity-odd correlators.

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  1. Parity-violating scalar trispectrum from helical primordial magnetic fields

    astro-ph.CO 2025-05 conditional novelty 7.0 of 10

    Helical primordial magnetic fields produce a computable parity-odd signal in the scalar trispectrum, currently constrained to r_H ≲ 4×10^-4 for B_r = 4.7 nG.

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