Algebraic Group Actions in Geometry Arithmetic and Physics
"Geometry, arithmetic, and quantum physics historically have had many points of intersection. This project will use recent techniques in algebraic group actions, especially those of Kirwan, to address problems of overlapping inter...
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Información proyecto AGAGAP
Duración del proyecto: 28 meses
Fecha Inicio: 2017-03-17
Fecha Fin: 2019-08-16
Fecha límite de participación
Sin fecha límite de participación.
Descripción del proyecto
"Geometry, arithmetic, and quantum physics historically have had many points of intersection. This project will use recent techniques in algebraic group actions, especially those of Kirwan, to address problems of overlapping interest to distinct research groups at the University of Oxford – Algebraic Geometry, Number Theory, Mathematical Physics, and the Centre for Quantum Mathematics and Computation.
Consider the following long-standing, a priori unrelated, questions. What is the minimal degree curve that passes through n points in general position in the plane (Nagata conjecture)? What is the growth rate of the number of integer lattice points in a variety (for us, universal torsor over a Fano variety) with respect to a height function (Manin conjecture)? How can one work with quantum entanglements of different qualitative character and associated entropies in a rigorous yet
experimentally friendly way?
These open questions turn out to admit a common source, at least in a large class of problems of interest. The crucial
ingredient is a suitable ""homotopic replacement for a universal torsor"" -- arising, in nice cases, from a key difference with topology, since in algebraic geometry algebraic affine line bundles needn't be vector bundles -- that often allows one to reduce to studying a simpler problem in group actions attached to an affine space rather than to a complicated variety or even more complicated universal torsor."