Neutralino Dark Matter in a Class of Unified Theories
ArXiv hep-ph/9209292 (1992)
Authors:
SA Abel, S Sarkar, IB Whittingham
Abstract:
The cosmological significance of the neutralino sector is studied for a class
of models in which electroweak symmetry breaking is seeded by a gauge singlet.
Extensive use is made of the renormalisation group equations to significantly
reduce the parameter space, by deriving analytic expressions for all the
supersymmetry-breaking couplings in terms of the universal gaugino mass
$m_{1/2}$, the universal scalar mass $m_0$ and the coupling $A$. The
composition of the LSP is determined exactly below the W mass, no
approximations are made for sfermion masses, and all particle exchanges are
considered in calculating the annihilation cross-section; the relic abundance
is then obtained by an analytic approximation. We find that in these models,
stable neutralinos may make a significant contribution to the dark matter in
the universe.
