У оквиру семинара Групе за гравитацију, честице и поља, у петак, 16. октобра 2026. године у 11 часова у сали 360 Института за физику у Београду, Душан Новичић одржаће предавање:
Probing Bordism Defects with SymTFT
САЖЕТАК:
There is abundant evidence that global symmetries are not allowed to be present in a theory of quantum gravity. This suggests that in consistent gravitational theories all symmetries are either gauged or broken. One way to ensure that transitions between different sectors are possible is to demand that the theory admits a boundary condition, which can be interpreted as a transition to the trivial sector. This idea is known as the Cobordism Conjecture, which states that a bordism group of deformation classes of d-dimensional manifolds with a structure imposed by the quantum gravity theory is trivial. Nontriviality of bordism groups implies there is a symmetry that should be broken predicting the existence of new defects that are part of the dynamical objects of the UV complete theory. In this talk we will propose a way of extracting properties of these defects. Employing modern techniques of geometrically engineering SymTFT, which is a particular topological field theory that captures symmetries as well as „discrete“ operations on qft, one can predict part of the symmetries and local degrees of freedom on the bordism defect uncovering part of their properties, which can further be used in order to infer the fundamental realization in the UV complete theory. We will explain a general picture and give a few simple examples. The talk is based on the work in progress with Markus Dierigl and Ignacio Ruiz.