  We conjecture that the logarithm of the absolute value of the constant in the
functional equation of the Hasse-Weil L-function of a variety X over Z is equal
to a certain Arakelov de Rham Euler characteristic of X. This generalizes the
fact that the constant in the functional equation of the zeta function of a
number field is the square root of the discriminant of its ring of integers. We
show that this conjecture is equivalent to Bloch's conjecture which expresses
the conductor as the degree of a localized Chern class of the differentials. We
prove both of these conjectures in the case of "tame" reduction.
