Homogeneous Forms Inequalities

Abstract: Given a set of inequalities determined by homogeneous forms, the following intertwined results are established: (1) the volume of the real semi-algebraic domain determined by these inequalities is explicitly determined; it is shown to be related to the largest root of the so-called Sato-Bernstein polynomial associated to a multivarite polynomial derived from the given set of homogeneous forms; (2) in relation with this result, the multiplicity of the largest root of the Sato-Bernstein polynomial of a multivariate polynomial is shown to coincide with the order of the smallest pole of the complex meromorphic zeta-distribution attached to it. This settles a classical problem in the theory of D-modules; (3) in the case that the homogeneous forms are twisted by random unimodular matrices, a metric, uniform and effective version of the Oppenheim conjecture is established. This answers a problem raised by Athreya and Margulis (2018). So does a related metric estimate counting the number of solutions in integer lattice points to the set of twisted inequalities. (4) in the deterministic case where the set of homogeneous forms is fixed, an upper bound is proved to hold for the function counting the number of integer solutions to the system of inequalities under consideration. The error term in this estimate is shown to admit a power saving provided that a quantitative measure of flatness emerging from geometric tomography is large enough. This settles a conjecture stated by Sarnak (1997).