| Saturday 20 April 2024 | |
| Events for day: Wednesday 04 August 2021 |
| 11:00 - 12:00 Wednesday Weekly Seminar-google meet Review of Plasma-based Wakefield Accelerators as An Energetic Particle Source School PARTICLES AND ACCELERATORS Abstract: Plasma wakefield accelerators produce accelerating fields thousands of times higher than radio-frequency accelerators, offering compactness and ultrafast bunches to extend the frontiers of high energy physics and to enable laboratory-scale radiation sources. Plasma based wakefield accelerators have seen tremendous progress in the last years, now capable of producing few-femtoseconds high quality electron beams in the GeV energy range. In this presentation, I am going to review the fundamental idea of plasma based wakefield accelerators and highlight different charged particle bunch injection scenarios in these acceleration structur ... 14:00 - 15:00 Weekly Seminar Joint measurability in phase space School NANO SCIENCES A fundamentally distinct feature in quantum mechanics compared to classical physics is the existence of measurements that cannot be performed simultaneously. This is known as measurement incompatibility, which is an essential resource for many quantum information-processing tasks. In this talk, I will introduce a new method for verification of joint measurability using phase-space quasiprobability distributions. This method establishes a connection between two notions of non-classicality, namely the negativity of quasiprobability distributions and measurement incompatibility. I will also discuss incompatibility-breaking sufficient conditions ... 17:00 - 18:00 Mathematics Colloquium: Kaplansky's conjectures School ISFAHAN BRANCH OF MATHEMATICS Three conjectures on group rings of torsion-free groups are commonly attributed to Kaplansky, namely the unit, zero divisor and idempotent conjectures. For example, the zero divisor conjecture predicts that if $K$ is a field and $G$ is a torsion-free group, then the group ring $K[G]$ has no zero divisors. I will survey what is known about the conjectures, including their relationships to each other and to other conjectures and group properties, and present my recent counterexample to the unit conjecture. |