  Within quantum field theory on a global monopole spacetime, we study thermal
effects on a naked singularity and its relation with boundary conditions. We
first obtain the two-points functions for the ground state and for thermal
states of a massive, arbitrarily-coupled, free scalar field compatible with
Robin boundary conditions at the singularity. We then probe these states using
a static Unruh-Dewitt particle detector. The transition rate is analyzed for
the particular cases of massless minimally or conformally coupled fields at
finite temperature. To interpret the detector's behavior, we compute the
thermal contribution to the ground-state fluctuations and to the energy
density. We verify that the behavior of the transition rate, the fluctuations
and the energy density are closely intertwined. In addition, we find that these
renormalized quantities remain finite at the singularity for, and only for,
Dirichlet boundary condition.
