We associate to a full flag F in an n-dimensional variety X over a field k, a "symbol map" µ F : K(F X ) → Σ n K(k). Here, F X is the field of rational functions on X, and K(·) is the K-theory spectrum. We prove a "reciprocity law" for these symbols: Given a partial flag, the sum of all symbols of full flags refining it is 0. Examining this result on the level of K-groups, we derive the following known reciprocity laws: the degree of a principal divisor is zero, the Weil reciprocity law, the residue theorem, the ContouCarrère reciprocity law (when X is a smooth complete curve) as well as the Parshin reciprocity law and the higher residue reciprocity law (when X is higher-dimensional).
We construct pointwise bounds in the weight aspect for Eisenstein series on $X_0(q) = \Gamma_0(q)\backslash{} SL_2(\mathbb{R})$, with squarefree level q, using a Sobolev technique. More specifically, we show that for an Eisenstein series E on $X_0(q)$ of weight parameter n and type t, one has for all $x\in X_0(q)$: $|E(x,1/2 + it)| \ll_{\epsilon} q^{\epsilon}(1 + |n|^{1/2 + \epsilon} + |t|^{1/2 + \epsilon})\sqrt{y(x) + y(x)^{-1}}$, where y(x) is the Iwasawa y-coordinate of the point x.
We construct pointwise bounds in the weight aspect for Eisenstein series on X0(q) = Γ0(q)\SL2(R), with squarefree level q, using a Sobolev technique. More specifically, we show that for an Eisenstein series E on X0(q) of weight parameter n and type t, one has for all x ∈ X0(q): |E(x, 1/2 + it)| ≪ǫ q ǫ (1 + |n| 1/2+ǫ + |t| 1/2+ǫ ) y(x) + y(x) −1 , where y(x) is the Iwasawa y-coordinate of the point x.
The equation x 2 +1 = 0 mod p has solutions whenever p = 2 or 4n+1. A famous theorem of Fermat says that these primes are exactly the ones that can be described as a sum of two squares. That the roots of the former equation are equidistributed is a beautiful theorem of Duke, Friedlander and Iwaniec from 1995. We show that a subsequence of the roots of the equation remains equidistributed even when one adds a restriction on the primes which has to do with the angle in the plane formed by their corresponding representation as a sum of squares.Similar to Duke, Friedlander and Iwaniec, we reduce the problem to the study of certain Poincare series, however, while their Poincare series were functions on an arithmetic quotient of the upper half plane, our Poincare series are functions on arithmetic quotients of SL2(R), as they have a nontrivial dependence on their Iwasawa θ-coordinate. Spectral analysis on these higher dimensional varieties involves the nonspherical spectrum, which posed a few new challenges. A couple of notable ones were that of obtaining pointwise bounds for nonspherical Eisenstein series and utilizing a non-spherical analogue of the Selberg inversion formula.
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