  We give an analysis of the spin-weighted Green's functions well-defined in a
conical space. We apply these results in the case of a straight cosmic string
and in the Rindler space in order to determine generally the Euclidean Green's
functions for the massless spin 1/2 field and for the electromagnetic field. We
give also the corresponding Green's functions at zero temperature. However,
except for the scalar field, it seems that these Euclidean Green's functions do
not correspond to the thermal Feynman Green's functions.
