У оквиру семинара Групе за гравитацију, честице и поља, у петак, 13. јуна 2025. године у 11:15 у сали 360 Института за физику у Београду, Душан Ђорђевић (Физички факултет, Универзитет у Београду) одржаће предавање:
Melvin universe, lambda/rho Minkowski twist and rotating frames
САЖЕТАК:
One approach to analyzing noncommutative field theory is through the so-called twist deformation. By considering matter fields propagating on a spacetime with twist deformation, one obtains corrections to the classical equations of motion. Interestingly, assuming that noncommutativity parameter is small, the resulting equations can often be written as classical commutative equations with an effective metric. In this work, we study the cylindrically symmetric Melvin solution of the Einstein–Maxwell equations with the \lambda/\rho-Minkowski-type twist and show that the resulting effective spacetime metric corresponds to a change of the reference frame to the one rotating with a constant angular velocity proportional to the charge of the field and the strenght of noncommutativity, regardless of whether the matter field is a scalar boson or a Dirac fermion. This result is the basis for deriving a quantum gravity-induced version of the Sagnac effect.