[hep-th] Seminar grupe za gravitaciju, cestice i polja, 27. oktobar 2021

[Marija Dimitrijevic Ciric]

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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.ipb.ac.rs/pipermail/hep-th/attachments/20211021/f4d7387a/attachment.htm>