  In a scenario with heavy supersymmetric sfermions and decoupled
supersymmetric Higgs sector, a well tempered neutralino is the remaining
candidate for thermal single-component sub-TeV dark matter. Well tempered
neutralinos are studied in the context of supersymmetric grand unified theories
with third family Yukawa coupling unification. A global chi^2 analysis is
performed, including the observables MW, MZ, GF, alpha_em, alpha_s(MZ), Mt,
mb(mb), Mtau, b -> s gamma, BR(Bs -> mu^+ mu^-), Mh and Omegah^2. Tensions in
simultaneously fitting the Higgs and bottom quark masses while also avoiding
gluino mass bounds from the LHC disfavors light Higgsinos with mass < 500 GeV,
ruling out light Bino/Higgsino dark matter candidates. Bino/Wino/Higgsino and
Bino/Wino candidates fare somewhat better although they are fine-tuned and
require departure from GUT scale gaugino mass universality (the example chosen
here is the mixed modulus-anomaly pattern). Implications for dark matter direct
detection of these models as well as collider signatures are briefly discussed.
Independent of the thermal dark matter viability, these models will be severely
constrained by the absence of a gluino at the next run of LHC.
