Zdravo svima,

evo najave seminara koji ce Wolfgang Martin Wieland (AUSTRIAN ACADEMY OF SCIENCES, INSTITUTE FOR QUANTUM OPTICS AND QUANTUM INFORMATION VIENNA) odrzati u SREDU 27. oktobra na Fizickom fakultetu.

Title: How the Immirzi Parameter deforms the SL(2,R) Boundary Symmetries on the Light Cone

Abstract: This talk describes how the Barbero--Immirzi parameter deforms the SL(2,R) symmetries on a null surface boundary. Our starting point is the definition of the action and its boundary terms. The action that we use is the usual Holst action. Compared to metric gravity it contains an additional coupling constant -- the Barber Immirzi parameter. Given the action and the boundary conditions, we introduce the covariant phase space and explain how the Holst term alters the boundary symmetries on a null surface. This alteration only affects the algebra of the edge modes on a cross-section, whereas the algebra of the radiative modes is unchanged by the addition of the Barbero--Immirzi parameter. To compute the Poisson brackets explicitly, we work on an auxiliary phase space, where the SL(2,R) symmetries of the boundary fields are manifest. The physical phase space is obtained by imposing both first-class and second-class constraints. All gauge generators are at most quadratic in terms of the fundamental SL(2,R) variables. Finally, we discuss various strategies to quantise the system.


Seminar pocinje u 13 CASOVA i bice uzivo na Fizickom fakultetu, u sali 661 (amfiteatru). Takodje, seminar se moze pratiti i preko linka

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



Pozdrav,

Marija


-- 
Marija Dimitrijevic Ciric

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