Indirect Detection of Neutralino Dark Matter
1999 (English)Doctoral thesis, comprehensive summary (Other academic)
The detection of dark matter is a primary issue in today's astrophysics. Although the lightest supersymmetric particle, generally assumed to be a neutralino, is an excellent dark matter candidate, it is not easy to prove that such particles are the main component of galactic halos. The present analysis is focussed in particular on examining the prospects of detecting neutralino dark matter through its pair annihilation into monochromatic gamma rays and into cosmic antiprotons.
There is no plausible astrophysical background for the gamma ray line signal from S-wave annihilations of massive relic particles into a two-body final state containing a photon. The possibility that such a signal might be detected by future high energy gamma ray experiments is examined in light of a full one loop calculation of neutralino annihilation into the 2-gamma and Z-gamma final states in the framework of the Minimal Supersymmetric extension to the Standard Model.
The neutralino-induced cosmic ray antiproton flux has a less well-defined signature, nevertheless it can be at the level of the background from ordinary cosmic ray interactions. The way the signal from neutralino annihilation arises is critically reexamined. We find cases (in a clumpy halo scenario) in which its contribution in the high energy part of the antiproton spectrum can be singled out unambiguously.
The complementarity among different dark matter detection techniques is discussed. This property is particularly interesting when we investigate the possibility that an excess in the continuum gamma ray background recently found in EGRET data can be interpreted in terms of neutralino annihilations.
Place, publisher, year, edition, pages
Stockholm: Stockholm University , 1999. , 117 p.
Research subject Theoretical Physics
IdentifiersURN: urn:nbn:se:su:diva-63948ISBN: 91-7153-915-8OAI: oai:DiVA.org:su-63948DiVA: diva2:453636
Kamionkowski, Marc, Professor
Härtill 7 uppsatser 2011-11-032011-11-03Bibliographically approved