Events
Particles and Fields Seminar
Generalized symmetries
Gabi Zafrir
Haifa University
Mon, 25 Nov 2024, 14:00
Sacta-Rashi Building for Physics (54), room 207
Abstract: Symmetries play an important role in physics. They lead to conservation laws, selection rules, and can be used to constrain dynamics in quantum field theory through 't Hooft anomalies. Recently, there has been a renewed interest in symmetries in quantum field theory, which was brought about by the discovery of novel types of symmetries. In this talk, I shall try to review this recent development.
Physics Colloquium
Gravitational Wave Astrophysics: 4th Observation Run
Dr. Ofek Birnholtz
Bar-Ilan University
Tue, 26 Nov 2024, 12:00
Ilse Katz Institute for Nanoscale Science & Technology (51), room 015
Abstract: Almost a decade since the first direct measurement of gravitational waves: what have we found? What are we still looking for, and how?
We’ll present the background, status, and possible future directions for Gravitational Wave observations and related physical research fields
Biological and soft-matter physics
TBA
Prof. Eytan Katzav
Racah Institute of Physics, The Hebrew University of Jerusalem
Thu, 28 Nov 2024, 12:00
Sacta-Rashi Building for Physics (54), room 207
Abstract: TBA
Particles and Fields Seminar
TBA
Eyoab Bahiru
Technion
Mon, 02 Dec 2024, 14:00
Sacta-Rashi Building for Physics (54), room 207
Abstract:
Physics Colloquium
Travelling waves in our immune system
Prof. Ariel Amir
Weizmann Institute of Science
Tue, 03 Dec 2024, 12:00
Ilse Katz Institute for Nanoscale Science & Technology (51), room 015
Abstract: In various biological scenarios, cells rely on the diffusion of signaling molecules to communicate, yet information needs to be communicated quickly and over large distances. How can the limitations of diffusion be surpassed? One solution Nature utilizes relies on "diffusive relays": upon sensing the signal, cells release more of it, thus creating an outgoing information wave. Mathematically, this mechanism manifests itself as an additional, non-linear, term in the diffusion equation, allowing for propagating wave solutions. The properties of these waves strongly depend on system dimensionality, and manifest intriguing phenomena, including regimes where wave velocity is independent of the diffusion constant. We recently proposed that such waves arise in the immune system, where upon sensing a signal, white blood cells known as neutrophils release a signaling molecule. However, in this case the waves must be self-extinguishing, since the range of cell recruitment must be limited. After introducing diffusive relays, I will discuss new mathematical models of self-extinguishing relays, and compare them to recent experiments on neutrophils.
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