Constrained Supersymmetric Flipped SU(5) GUT Phenomenology
  We explore the phenomenology of the minimal supersymmetric flipped SU(5) GUT
model (CFSU(5)), whose soft supersymmetry-breaking (SSB) mass parameters are
constrained to be universal at some input scale, $M_{in}$, above the GUT scale,
$M_{GUT}$. We analyze the parameter space of CFSU(5) assuming that the lightest
supersymmetric particle (LSP) provides the cosmological cold dark matter,
paying careful attention to the matching of parameters at the GUT scale. We
first display some specific examples of the evolutions of the SSB parameters
that exhibit some generic features. Specifically, we note that the relationship
between the masses of the lightest neutralino and the lighter stau is sensitive
to $M_{in}$, as is the relationship between the neutralino mass and the masses
of the heavier Higgs bosons. For these reasons, prominent features in generic
$(m_{1/2}, m_0)$ planes such as coannihilation strips and rapid-annihilation
funnels are also sensitive to $M_{in}$, as we illustrate for several cases with
tan(beta)=10 and 55. However, these features do not necessarily disappear at
large $M_{in}$, unlike the case in the minimal conventional SU(5) GUT. Our
results are relatively insensitive to neutrino masses.
