  We study the properties of heavy quarkonia in a quark-gluon plasma in the
presence of bulk viscous effects. Within the hard thermal loop approximation at
one-loop, the dielectric permittivity of quark-gluon plasma is computed, where
the bulk viscous effect enters through the deformation of the distribution
functions of thermal quarks and gluons. Based on the modified dielectric
permittivity, we compute the in-medium heavy quark potential, that includes
non-pertubative string-like terms as well as the perturbative Coulombic term.
We discuss how the bulk viscous effect modifies the real and imaginary parts of
the in-medium potential. Several prescriptions are examined as to how to
include the string-like non-perturbative potentials. Using the deformed
potential, we compute the wave functions, binding energies, and decay widths of
heavy quarkonia in a bulk viscous medium, and study their sensitivity to the
strength of the bulk viscous effect. An estimate of the melting temperatures is
given.
