Precise calculation of neutralino relic density in the minimal supergravity model

Details Precise calculation of neutralino relic density in the minimal supergravity model Precise calculation of neutralino relic density in the minimal supergravity model

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cosm.conf..271n&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

We study precise calculation of neutralino relic density in the minimal supergravity model. We compare the exact formula for the thermal average of the neutralino annihilation cross section times relative velocity with the expansion formula in terms of the temperature, including all the contributions to neutralino annihilation cross section analytically. We confirm that the expansion formula fails badly near s-channel poles. We show that the expansion method causes 5-10 % error even far away from the poles.

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