[hep-th] Семинар групе за гравитацију, честице и поља, петак, 16. октобар 2026.

[Igor Prlina]

Драге колеге,

У петак 16. октобра, у 11 сати, у сали 360 Института за физику, одржаће 
се семинар наше групе.

Колега Душан Новичић причаће нам о теми "Probing Bordism Defects with 
SymTFT".

Aпстракт: 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.

Све најбоље,

Игор Прлина