[hep-th] Seminari grupe za gravitaciju, cestice i polja, 18. i 19. maj 2023

[Marija Dimitrijevic Ciric]

Zdravo svima,

kao sto znate, ove nedelje imamo goste iz inostranstva: prof. Richard 
Szabo (Heriot-Watt University, Edinburgh), prof. Vladislav Kupriyanov 
(Universidade Federal do ABC, São Paulo) i dr Larisa Jonke (IRB, 
Zagreb). Gosti ce biti na Fizikom fakultetu od ponedeljka do cetvrtka, a 
u petak cemo biti na Institutu. Evo najave seminara u cetvrtak i petak. 
Obratite paznju da su navedena vremena bez 15 minuta kasnjenja, dakle 
seminari pocinju tacno u navedeno vreme.

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Cetvrtak 18. maj, Fizicki fakultet, sala 665

15:00-16:00 dr Igor Prlina (Institut za fiziku, Zemun)

Naslov:  Amplitugicians: Using (non-magic) Tricks to Find Scattering 
Amplitudes

Asptrakt: This talk will introduce the audience to the goals and methods 
of the so-called Amplitudes project, where alternatives to the Feynman 
diagram approach are used to calculate scattering amplitudes in 
different theories. Some common themes in the Amplitudes approach are 
symmetry adapted variables, recursive relations and geometric 
interpretation. These themes will be illustrated by introducing spinor 
helicity formalism, BCFW recursion, momentum twistors, and the 
Amplituhedron. Finally, some of the lecturer's own results on the 
connection of the boundaries of the Amplituhedron with amplitude 
singularities will be presented.

16:00-17:00 prof. Richard Szabo (Heriot-Watt University, Edinburgh)

Naslov: Homotopy double copy of noncommutative gauge theories

Apstrakt: This talk will summarise recent work attempting to understand 
how standard noncommutative gauge theories, such as those which arise 
naturally from string theory, fit into the paradigmof colour-kinematics 
duality and the double copy of gauge theory to gravity. The treatment 
will focus on the elegant formulation of the double copy prescription 
using homotopy algebras. Along the way we shall encounter some novel 
noncommutative scalar field theories with rigid colour symmetry that 
have no commutative counterparts, whose double copies are deformations 
of some known topological theories such as the special Galileon theory 
in two dimensions and self-dual gravity in four dimensions.

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Petak 19. maj, Institut za fiziku

11:00-12:00 prof. Vladislav Kupriyanov (Universidade Federal do ABC, São 
Paulo)

Naslov:  Homotopy algebras, symplectic embeddings and noncommutative 
gauge theory

Asptrakt: The problem of the consistent definition of noncommutative 
gauge theory on spaces with non-constant noncommutativity parameters has 
attracted the attention of theoretical physicists and mathematicians for 
more than two decades. Nevertheless, this theory is still not completely 
understood in full generality. In recent years we have formulated two 
new approaches to consistent non-commutative and non-associative 
deformations of gauge theory. The first one employs the framework of 
homotopy algebras and is a powerful tool for the construction of order 
by order noncommutative deformation. The second approach makes use of 
the elements from the symplectic geometry and is better adapted for 
obtaining the explicit all-order expressions. Several interesting 
results have been obtained and published in this direction. In this talk 
I will briefly describe the two approaches and discuss the recent 
progress in noncommutative gauge theories.

12:00-13:00 prof. Maja Buric (Fizicki fakultet, Beograd)

Naslov: Scalar fields on fuzzy de Sitter space

Apstrakt: After a short introduction of fuzzy de Sitter geometry, we 
present general
solution to the Klein-Gordon equation on this noncommutative space.

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Pozdrav!

Marija


-- 
Marija Dimitrijevic Ciric

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