У оквиру семинара Групе за гравитацију, честице и поља Института за физику у Београду, у петак, 19. маја 2023. године у 12 часова на Институту за физику у Београду, проф. Маја Бурић (Физички факултет у Београду) одржаће предавање:

Scalar fields on fuzzy de Sitter space

САЖЕТАК:

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

У оквиру семинара Групе за гравитацију, честице и поља Института за физику у Београду, у петак, 19. маја 2023. године у 11 часова на Институту за физику у Београду, проф. Владислав Купријанов (Федерални универзитет АБЦ, Сао Пауло) одржаће предавање:

Homotopy algebras, symplectic embeddings and noncommutative gauge theory

САЖЕТАК:

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.

У оквиру семинара Групе за гравитацију, честице и поља Института за физику у Београду, у четвртак, 18. маја 2023. године у 16 часова на Физичком факултету у Београду у сали 665, проф. Ричард Сабо (Хериот-Ват Универзитет, Единбург) одржаће предавање:

Homotopy double copy of noncommutative gauge theories

САЖЕТАК:

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.

У оквиру семинара Групе за гравитацију, честице и поља Института за физику у Београду, у четвртак, 18. маја 2023. године у 15 часова, на Физичком факултету у Београду, у сали 665, др Игор Прлина (Институт за физику у Београду) одржаће предавање:

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

САЖЕТАК:

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.

У оквиру семинара Центра за изучавање комплексних система Института за физику у Београду, у четвртак, 18. маја 2023. године у 14 часова путем Zoom платформе, др Андреј Парначев (Математичка школа и Математички институт Хамилтон, Тринити колеџ, Даблин, Ирска), одржаће предавање:

Holographic correlators at finite temperature

САЖЕТАК:

In this talk we will consider finite temperature two-point functions in strongly coupled quantum field theories described by holographically dual gravities and will discuss their applications. After reviewing the basics of gravitational holography at finite temperature, we will introduce some recent results, which hint at a universal behavior of the correlators in certain kinematical regimes.

Приступите предавању
Meeting ID: 818 0946 2344
Passcode: 851078

У оквиру семинара Центра за изучавање комплексних система Института за физику у Београду, у четвртак, 11. маја 2023. године у 14 часова путем Zoom платформе, др Милан Радоњић (Центар за изучавање комплексних система, Институт за физику у Београду; Институт за теоријску физику, Универзитет у Хамбургу, Немачка), одржаће предавање:

Out of equilibrium dynamical properties of Bose-Einstein condensates in ramped up weak disorder

САЖЕТАК:

In this talk we will discuss, from the theoretical point of view, how the superfluid and the condensate deformation of a weakly interacting ultracold Bose gas evolve during the ramping up of an external weak disorder potential. Both resulting deformations turn out to consist of two distinct contributions, i.e., a reversible equilibrium one [1,2], as well as a non-equilibrium dynamical one, whose magnitude depends on the details of the ramping protocol [3]. For the specific case of the exponential ramping up protocol, we will derive analytic time-dependent expressions for the aforementioned quantities. After sufficiently long time, the steady state emerges that is generically out of equilibrium. We will discuss how to examine properties of such a state by studying the relaxation dynamics into it. Also, we will consider the two-time correlation function and elucidate its relation to the equilibrium and the dynamical part of the condensate deformation.

[1] K. Huang and H.-F. Meng, Phys. Rev. Lett. 69, 644 (1992).
[2] B. Nagler, M. Radonjić et al., New J. Phys. 22, 033021 (2020).
[3] M. Radonjić and A. Pelster, SciPost Phys. 10, 008 (2021).

Приступите предавању
Meeting ID: 831 9906 2589
Passcode: 402537