Mathematics – Algebraic Geometry
Scientific paper
2001-11-18
American Journal of Mathematics 125 (2003), 669-690.
Mathematics
Algebraic Geometry
18 pages, LaTeX
Scientific paper
For a polynomial f(x) in (Z_p\cap Q)[x] of degree d>2 let L(f mod p;T) be the L-function of the exponential sum of f mod p. Let NP(f mod p) denote the Newton polygon of L(f mod p;T). Let HP(f) denote the Hodge polygon of f, which is the lower convex hull in the real plane of the points (n,n(n+1)/(2d)) for 0\leq n\leq d-1. We prove that there is a Zariski dense subset U defined over Q in the space A^d of degree-d monic polynomials over Q such that for all f in U(Q) we have lim NP(f mod p) = HP(f) as p approaches infinity. Moreover, we determine the p-adic valuation of every coefficient of L(f mod p;T) for p large enough and f in U(Q).
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