PERTURBATIVE QED ON DE SITTER UNIVERSE

Lecturer is Cosmin Crucean (Theoretical and Applied Physics, West University of Timisoara, Romania). Lectures will be held on Friday July 9, 2010 in the Room 100, at the Faculty of Science and Mathematics Nis at 2.00pm.

Abstract: The theory of interaction between fields on de Sitter universe is developed using the same methods as in Minkowski theory. The scattering amplitudes in the first order of perturbation theory are calculated and the physical consequences of our result are discussed. One obtains that contrary with Minkowski case the modulus of momentum is not conserved.

“Symmetries in Field Theory”

Lecturer is prof. dr Ludmil Hadjiivanov, Elementary Particles Theory Lab., INRNE, Bulgarian Academy of Sciences, Sofia, Bulgaria.

Lecure 1: Tuesday, 29 June, 2010, at 13.15pm.
Groups – an introduction. Various types of groups and group structures. Representations. Schur’s lemma.

Lecture 2: Wednesday, 30 June, 2010, at 13.00pm.
Space-time groups (rotation group, Lorentz and Poincaré groups, conformal group). Groups of internal (gauge) symmetries (Standard Model and GUTs). Examples and applications.

Lecture 3: Thuesrday, 1 July, 2010, at 11.00pm.
Semisimple Lie groups and Lie algebras – general theory and finite dimensional representations. Schur-Weyl duality. Superselection sectors. Observables and symmetries in QFT. Supersymmetry.

Lectures will be held in the Room 100, at the Faculty of Science and Mathematics Nis.

“Time-Delay Feedback Control of Nonlinear Oscillators”

Lecturer is prof. dr Viktor Urumov, Faculty of Science and Mathematics, Saint Cyril and Methodius University, Skopje, Macedonia. Lectures will be held on Wednesday 30 June, 2010 in the Room 100, at the Faculty of Science and Mathematics Nis at 12.00pm.

Abstract: In the introductory part several examples of nonlinear oscillators will be provided, such as van der Pol, Lorenz and Roessler models, commonly present in the current literature related to studies of simple dynamic systems with complex behavior. Another well known system of phase oscillators analytically solved by Kuramoto undergoes phase transition into synchronized state when the strength of coupling between oscillators exceeds some critical value.

The main part of the lecture will provide information on recently published results on stabilization of unstable fixed points of nonlinear oscillators. The stabilization is successful in wider domain and becomes more robust when the feedback term of Pyragas type contains varying delay. The method is first applied to individual oscillators defined by systems of ordinary differential equations and systems described by time-delay equations, e.g. the equation of Mackey-Glass, and then to systems of coupled nonlinear oscillators introduced to model the behavior of neurons.

23-25 June 2010, Salamis Bay Conti Resort Hotel
North Cyprus

The main goal of this conference is to present and discuss new trends in education.

INTE-2010 conference is supported by many universities and organizations. INTE-2010 has already formed a large, multi-national and friendly community of colleagues who love to share ideas. INTE-2010 invites you to submit proposals for papers, panels, best practices, roundtables, tutorials, posters/demonstrations, and workshops.

P-adic Wavelet Bases and Frames

Lecturer is dr Sergey KOZYREV, Steklov Mathematical Institute (Moscow, Russia). Lectures will be held on May 25, 2010 in the Room 100, at the Faculty of Science in Nis at 12.15pm.

Abstract: Definition of p-adic wavelet basis is given. Relation to real wavelets is discussed. Relation to spectral analysis of pseudodifferential operators is described. The construction of frames of p-adic wavelets as orbits of the affine group is described. Multidimensional wavelet basis is constructed and the relation to the representation theory is discussed.

On behalf of SEENET-MTP Network agreement was signed by Prof. Dr. Goran Djordjevic, executive director of the Network, and Prof. Dr. Argyris Nikolaidis, memeber of Executive committee of the Network.