[institut] [phys4phys] Group for Gravitation, Particle and Fields on-line seminar, Friday 15 April 2022

[Marija Dimitrijevic Ciric]

Dear colleagues,

You are cordially invited to the online seminar of the Group for 
Gravitation, Particles and Fields, which will be held on Friday, 15 
April 2022 at 11:00 via the BigBlueButton platform (link is given 
below).


The talk entitled

Noncommutative D=5 Chern-Simons Gravity: Kaluza-Klein Reduction and 
Chiral Gravitational Anomaly

will be given by Dusan Djordjevic (Faculty of Physics, Belgrade).

Abstract: Chern-Simons (CS) theory has greatly influenced physics and 
physicists during the past half-century. In this seminar, we will review 
some basic facts about Chern-Simons Lagrangians defined on some 
(2n-1)-dimensional manifold. We will then show how CS theory can be 
connected with gravity. Our focus will be on an SO(4,2) CS gravity in 
five dimensions and its connections with four-dimensional gravitation. 
Furthermore, we will analyse the noncommutative deformation of SO(4,2) 
CS gravity using the geometric Siberg-Witten map. This theory has a 
nontrivial first-order correction in \theta. By performing Kalutza-Klein 
dimensional reduction and suitable symmetry breaking, we obtain an 
effective, four-dimensional gravity theory that has Einstein-Hilbert 
action with (negative) cosmological constant as its classical 
(commutative) limit. We then proceed to analyse some concrete solutions 
of the field equations. We show that AdS space-time remains a solution 
after including the first-order corrections. On the other hand, 
AdS-Schwarzschild black hole solution develops a torsion that we 
explicitly compute. Moreover, we will see that this modified solution 
implies the existence of a chiral gravitational anomaly if one couples 
massless Dirac fermions to this NC background.

This seminar is based on arXiv:2203.05020



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Time: April 15, 2022 11:00 Belgrade

https://gravityserver.ipb.ac.rs/b/mar-xoo-t1v-vwn

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Best regards,

Marija Dimitrijevic Ciric

University of Belgrade
Faculty of Physics
Studentski trg 12-16
11000 Belgrade
Serbia