| Wednesday 24 April 2024 | |
| Events for day: Wednesday 28 October 2020 |
| 11:00 - 12:00 Wednesday Weekly Seminar-skyroom Chiral vortical and magnetic effects on the hypermagnetic field and the matter-antimatter asymmety School PARTICLES AND ACCELERATORS Abstract: We talk about the contribution of the chiral vortical effect, in addition to that of the chiral magnetic effect, to the evolution of the hypermagnetic field and the matter-antimatter asymmetry in the symmetric phase of the early Universe in the temperature range 100 GeV ? T ? 10 TeV. We show that the most pronounced effect of the chiral vorticity is the production and initial growth of the hypermagnetic field; while, further growth and saturation of the hypermagnetic field occurs due to the chiral magnetc effect. Moreover, damping of the vorticity due to the presence of viscosity which typically occurs extremely rapidly, does not si ... 13:30 - 15:00 Weekly Seminar (Online) Tracing the Stellar Mass Assembly within Galaxies https://www.skyroom.online/ch/soa/weekly-seminar School ASTRONOMY One of the important questions in galaxy formation and evolution is to understand how the stellar mass has been assembled within galaxies. The formation of prominent central densities known as bulges is an example of this evolution and the true mechanisms behind this transformation are a matter of debate. In this talk, I will overview the importance of addressing this question and describe the observational methods that we used for tracing the assembly of stellar mass within galaxies. I will also explain how we can benefit from studying the scaling relations such as size-mass relation. In addition, possible connections of the structural evolu ... 14:00 - 15:00 Weekly Seminar Condensed Matter and Statistical Physics Group Magnon-polarons in magnetic insulators School PHYSICS Abstract: Magnetization dynamics can be affected by lattice distortions and vice versa through magnetoelastic coupling, as demanded by reciprocity. The magnetoelastic coupling results in a hybridized state, i.e., a magnon-polaron. While the magnon and elastic modes repel each other via the magnetoelastic coupling in a ferromagnetic insulator, for the coupled magnon and acoustic modes in an antiferromagnetic insulator, a level attraction can occur upon varying the external magnetic field. I will discuss a nonlocal spin transport that can probe the anomalous features caused by magnon-polaron formation. Da ... 15:30 - 17:30 Mathtematical Logic Weekly Seminar In Search of Higher Forcing Axioms; A Supplement to Veličković's talk School MATHEMATICS This talk should be regarded as a continuation of the latest talk delivered at IPM logic webinar by Veličković. I will review briefly the Veličković' story, and then introduce certain combinatorial principles originating from large cardinals. Though I will be concentrating on their correlation with other well-known consequences of PFA, if time permits, I will also sketch the proof of a theorem obtained in collaboration with Veličković. To join this webinar, please send an email to r.zoghi@gmail.com. ... |