| Thursday 25 April 2024 | |
| Events for day: Wednesday 17 August 2022 |
| 11:00 - 12:00 Wednesday Weekly Seminar - google meet The effects of non-helical component of hypermagnetic field on the evolution of the matter-antimatter asymmetry, vorticity, and hypermagnetic field School PARTICLES AND ACCELERATORS Abstract: We study the evolution of the matter-antimatter asymmetry ($eta $), the vorticity, and the hypermagnetic field in the symmetric phase of the early Universe, and in the temperature range $100 mbox{GeV}le Tle10 mbox{TeV}$. We assume a configuration for the hypermagnetic field which includes both helical and non-helical ($B_z$) components. Consequently, the hypermagnetic field and the fluid vorticity can directly affect each other, the manifestations of which we explore in three scenarios. In the first scenario, we show that in the presence of a small vorticity and a large $eta_{e_R} $, helicity can be generated and ampl ... 14:00 - 15:00 Combinatorics and Computing Weekly Seminar The R-neighbor Bootstrap Percolation Process on Graphs School MATHEMATICS The r-neighbor bootstrap percolation is the most studied version of bootstrap percolation processes on graphs. The process was introduced in 1979 by Chalupa, Leath, and Reich in Physics. In the r-neighbor bootstrap percolation process on a graph, first some vertices are initially activated and then, in each phase, any inactive vertex with at least r active neighbors becomes activated. Once a vertex becomes activated, it remains active forever. The process has also been treated in the literature under other names like irreversible threshold, influence propagation, and dynamic monopoly. In this talk, we survey some previous results about the r- ... 17:00 - 18:00 Weekly Seminar Condensed Matter and Statistical Physics Group Simulation of the Extended Fermi-Hubbard Model using Arrays of Quantum Dots School PHYSICS Abstract: The extended Fermi-Hubbard model has recently been realized in an artificial lattice of dopant-based quantum dots in silicon [1], where it is shown that parameters such as the nearest-neighbor tunnelling amplitude and interactions can be effectively tuned using controlled placement of dopant atoms with atomic-scale precision. Access to low temperatures, the permanent nature of the systems, and the availability of measurement tools in a condensed matter setting make them an exciting new class of engineered artificial lattices to simulate Fermi-Hubbard models. In this talk, I will introduce the experimental setup and discuss t ... |