Physics
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cosm.conf...71r&link_type=abstract
COSMO-2000 . Proceedings of the Fourth International Workshop on Particle Physics and the Early Universe . Held 4-8 September 20
Physics
Scientific paper
Supersymmetric extensions of the Standard Model which incorporate the axion solution to the strong CP problem necessarily contain also the axino, the fermionic partner of the axion. In contrast to the neutralino and the gravitino, the axino mass is generically not of the order of the supersymmetry breaking scale and can be much smaller. The axino is therefore an intriguing candidate for a stable superpartner. It has been recently shown that axinos are a natural candidate for cold dark matter in the Universe when they are generated non-thermally through out-of-equilibrium neutralino decays. Here, we extend the study of non-thermal production and include a competing thermal production mechanism through scatterings and decays of particles in the plasma. We identify axino masses in the range of tens of MeV to several GeV (depending on a scenario) as corresponding to cold axino relics if the reheating temperature TR is less than about 5 × 104 GeV. At higher TR and lower mass, axinos could constitute warm dark matter. In the scenario with axinos as relics the gravitino problem finds a natural solution. The lightest superpartner of the Standard Model spectrum will remain stable in high-energy detectors but may be either neutral or charged. The usual constraint Ωχh2 ≲ 1 on the relic abundance of the lightest neutralino becomes void.
No associations
LandOfFree
Axino - New Candidate for Cold Dark Matter does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Axino - New Candidate for Cold Dark Matter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Axino - New Candidate for Cold Dark Matter will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1486341