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Galactic Dark Matter signal and the Fermi-LAT measurement of the diffuse gamma-ray emission
Gabrijela Zaharijas, objavljeni znanstveni prispevek na konferenci

Opis: We study diffuse gamma-ray emission at intermediate Galactic latitudes measured by the Fermi LAT with the aim of searching for a signal from dark matter annihilation or decay. In the absence of a robust dark matter signal, constraints are presented. We present and improve upon conservative dark matter limits obtained with no modeling of the foreground astrophysical diffuse emission. We do so, by taking into account uncertainties in several parameters which characterize conventional astrophysical emission and using a profile likelihood formalism. The resulting limits impact the range of particle masses over which dark matter thermal production in the early Universe is possible, and challenge the interpretation of the PAMELA/Fermi-LAT cosmic ray anomalies as annihilation of dark matter.
Najdeno v: osebi
Ključne besede: Dark matter, high-energy gamma rays
Objavljeno: 21.03.2016; Ogledov: 2083; Prenosov: 0
.pdf Polno besedilo (1,04 MB)

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Asymmetric WIMP Dark Matter in the presence of DM/anti-DM Oscillations
Gabrijela Zaharijas, 2012, objavljeni povzetek znanstvenega prispevka na konferenci

Opis: The class of ‘Asymmetric Dark Matter’ scenarios relies on the existence of a primordial particle/anti-particle asymmetry in the dark sector related to the baryon asymmetry as a way to address the observed similarity between the baryonic and dark matter energy densities today. Focusing on this framework we calculate the evolution of the dark matter relic abundance in the presence of particle/anti-particle oscillations. We show how oscillations reopen the parameter space of asymmetric dark matter models, in particular in the direction of allowing large (WIMP-scale) DM masses. Finally, we constrain the parameter space in this framework by applying up-to-date bounds from indirect detection signals on annihilating DM.
Najdeno v: osebi
Ključne besede: dark matter, early universe
Objavljeno: 23.03.2016; Ogledov: 1813; Prenosov: 0
.pdf Polno besedilo (431,48 KB)

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