Speaker
Dr
Manuel Meyer
(Stockholm University, Oskar Klein Centre)
Description
Axionlike particles (ALPs) are dark-matter candidates that
occur in a variety of extensions of the Standard Model.
Signatures of these particles could be detected at gamma-ray
energies with the Fermi Large Area Telescope (LAT) due to
the coupling of ALPs to photons in external electromagnetic
fields.
To date, Fermi-LAT observations provide the strongest
constraints on the photon-ALP coupling for ALP masses
between 0.5 and 20 neV. Here, we summarize these constraints
and present the sensitivity to detect an ALP induced
gamma-ray burst from a Galactic core-collapse supernova.
ALPs would be produced in the stellar medium via the
Primakoff effect and convert into gamma rays in the Galactic
magnetic field. Fermi LAT observations would be able to
probe couplings where ALPs could constitute the entire dark
matter. Below 1 neV, the Fermi-LAT sensitivity would surpass
that of future laboratory experiments by one order of magnitude.
Primary author
Dr
Manuel Meyer
(Stockholm University, Oskar Klein Centre)
