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arXiv · 1910.11867

From diffuse extragalactic and galactic gamma rays to limits on extra dimensions

Michel Cassé·Bruno Mansoulié·Joseph Silk
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Abstract

We derive the maximum fraction of energy emitted in the form of massive (Kaluza- Klein) gravitons by core collapse supernovae, and the corresponding minimal extra-dimensional Planck mass M* in the ADD gravity framework at TeV scales. Our constraints arise: a) from the extragalactic gamma ray background observed by Fermi-LAT after astrophysical sources have been removed, and b) via the residual galactic emission left after astrophysical and potentially dark matter emission have been removed. We focus on a number of extra dimensions 3 and 4, since M* is then in the TeV range, where astrophysical and collider constraints compete. Lower limits on M* are derived in case a) of 8.0 TeV and 1.1 TeV, and in case b) of 16 TeV and 1.9 TeV, for a number of extra dimensions n=3 and n=4 respectively. These limits are especially robust and insensitive to the various uncertainties involved.

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Michel Cassé, Bruno Mansoulié, Joseph Silk. 2019-10-25. From diffuse extragalactic and galactic gamma rays to limits on extra dimensions. https://doi.org/10.1093/mnrasl%2Fslz155

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