From diffuse extragalactic and galactic gamma rays to limits on extra dimensions
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.
Keywords
Cite
@article{arxiv.1910.11867,
title = {From diffuse extragalactic and galactic gamma rays to limits on extra dimensions},
author = {Michel Cassé and Bruno Mansoulié and Joseph Silk},
journal= {arXiv preprint arXiv:1910.11867},
year = {2019}
}
Comments
4 pages, to appear in MNRAS Letters