A geometric invariant theory construction of moduli spaces of stable maps
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We construct the moduli spaces of stable maps, \bar M_g,n(P^r,d), via geometric invariant theory (GIT). This construction is only valid over Spec C, but a special case is a GIT presentation of the moduli space of stable curves of genus g with n marked points, \bar M_g,n; this is valid over Spec Z. Our method follows that used in the case n=0 by Gieseker to construct \bar M_g, though our proof that the semistable set is nonempty is entirely different.
75 pages LaTeX; the GIT construction of moduli spaces of stable n-pointed curves is now given over the integers
75 pages LaTeX; the GIT construction of moduli spaces of stable n-pointed curves is now given over the integers