| Thursday 18 April 2024 | |
| Events for day: Wednesday 23 December 2020 |
| 11:00 - 12:00 Wednesday Weekly Seminar-skyroom Determination of generalized parton distributions School PARTICLES AND ACCELERATORS Abstract: In this work, we present a new set of unpolarized (H) and polarized (H ?) generalized parton distributions (GPDs) that have been determined using a simultaneous ?2 analysis of the nucleon axial form factor (AFF) and wide-angle Compton scattering (WACS) experimental data at the next-to-leading order (NLO) accuracy in QCD. We explore various Ansatzes presented in the literature for GPDs, which use forward parton distributions as input, and choose the ones most suited to our analysis. The experimental data included in our analysis cover a wide range of the squared transverse momentum, which is 0.025 14:00 - 15:00 Weekly Seminar Condensed Matter and Statistical Physics Group Anomalous collective excitations in Weyl semimetals School PHYSICS Abstract: The discovery of Weyl semimetalshas opened new avenues in the field of topological condensed matter.In Weyl semimetals, the band crossing is topologically protected, while in topological insulators, the gap is robust under perturbations.One of the most important consequences of the topological nature of bulk states in Weyl semimetals is an unprecedented and exotic arc-shape surface states. Such a Fermi arc is the connection between the projection of bulk Weyl nodes on the surface of the Brillouin zone, which leads to the unique transport properties. In this talk, I will introduce a short history of how Weyl phase has ... 16:00 - 18:00 Mathtematical Logic Weekly Seminar The Herwig--Lascar Property of Groups, Ultraextensive Structures and Vershik's Conjecture School MATHEMATICS We study a notion of HL-extension (HL standing for Herwig--Lascar) for a structure in a finite relational language $mathcal{L}$. We give a description of all finite minimal HL-extensions of a given finite $mathcal{L}$-structure. In addition, we study a group-theoretic property considered by Herwig--Lascar and show that it is closed under taking free products. We also introduce notions of coherent extensions and ultraextensive $mathcal{L}$-structures and show that every countable $mathcal{L}$-structure can be extended to a countable ultraextensive structure. Finally, we introduce a notion of omnigenous group and verify a conjecture of Versh ... |