  Theoretical studies of quarkonia can elucidate some of the important
properties of the quark--gluon plasma, the state of matter realised when the
temperature exceeds 150 MeV, currently probed by heavy-ion collisions
experiments at BNL and the LHC. We report on our results of lattice studies of
bottomonia for temperatures in the range 100 MeV < T < 450 MeV, introducing and
discussing the methodologies we have applied. Of particular interest is the
analysis of the spectral functions, where Bayesian methods borrowed and adapted
from nuclear and condensed matter physics have proven very successful.
