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Biophysics and Interdisciplinary Research

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Yesterday

astrolunch: Thorsten Naab
- Start time: 12:30pm
- End date: Tuesday, November 12th
- End time: 01:30pm
- Title: 14 orders of magnitude - from the multi-phase ISM to IMBH formationSpeaker: Thorsten NaabAbstract: The rapid collision of stars and compact objects in young, dense and massive star clusters has been proposed in the late 70’s as a formation channel for the first massive black holes as the seeds for supermassive black holes. Confirming this process with numerical models has been a challenge since then. A self-consistent model following the formation of a galactic star cluster in a massive gas cloud down to the coalescence of black holes would have to cover more than 14 orders of magnitude in spatial resolution and complex physical processes. We present recent progress in high-resolution hydrodynamical simulations of the formation of compact massive star clusters in galactic starbursts with resolved multi-phase ISM and individually sampled stars. With accurate Nbody simulations of such compact star clusters we show that stellar and compact object collisions can result in the formation of massive black holes consistent with recent gravitational wave detections. We discuss successes and limitations of novel simulations techniques which will eventually bridge the gap between galaxy formation, interstellar medium, star formation and stellar evolution studies. Such approaches are required for a comprehensive understanding the formation of massive black holes – a fundamental science question in the era of JWST, ELT and gravitational wave detectors.Zoom: https://huji.zoom.us/j/86991266018?pwd=UWRmWDhGM3NudnhHVUJXdmQ4RnFTZz09Meeting ID: 869 9126 6018 Passcode: 537391Contact: Zhaozhou Li
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Today

Nonlinear Physics seminar: "Investigating Topological Defects in Active Nematic Multicellular Systems"
- Start time: 12:00pm
- End date: Wednesday, November 13th
- End time: 01:30pm
- Lecturer: Dr. Victor Yashunsky, Ben-Gurion University in the Negev Abstract:Multicellular systems, such as tissues and bacterial colonies, function as dynamic assemblies of self-propelled units that exhibit collective behaviors, resulting in complex biological functions. These systems, often characterized by elongated particles, display "nematic" ordering, with spatial organization described by a director field. Within this field, topological defects emerge as inherent structural features, significantly impacting the system’s dynamics and evolution. The interactions among these defects—including attraction, repulsion, and alignment—play a crucial role in driving reorganization within the system. In this presentation, I will share experimental findings from various multicellular systems, focusing on flow patterns around nematic defects and the interactions between defects during annihilation and creation events.
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Monday, November 18th

Physics Colloquium : "Using Quantum Information and Quantum Technologies for Lattice Gauge Theories without waiting for Quantum Computers"
- Start time: 12:00pm
- End date: Monday, November 18th
- End time: 01:30pm
- Lecturer: Erez Zohar, Racah Institute of Physics, Hebrew University of JerusalemAbstract:In the recent decades, a lot of progress has been made in the fields of quantum information and quantum technologies, towards the development of quantum computers.While the impressive development has not given rise yet to a large-scale universal quantum computer which can implement any algorithm, as physicists we do not necessarily have to wait for this to open in order to harness these impressive developments for finding new ways to solve long-standing challenges in quantum many-body physics. In fact, the combination of already existing tools and technologies with physical concepts allows us to develop and implement methods which may be even better tailored to specific, yet interesting and very hard nonperturbative problems in quantum field theories. In my talk I will review two such methods - quantum simulation and tensor network states, and discuss how to apply them for simplifying problems in lattice gauge theories such that current technologies would be sufficient for approaching their solution.
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Tuesday, November 19th

Astrolunch: Violetta Sagun
- Start time: 12:30pm
- End date: Tuesday, November 19th
- End time: 01:30pm
- Title: Probing dark matter with neutron stars and their mergers Abstract:Compact stars due to their enormous gravitational field can accumulate a sizable amount of dark matter in their interior. Depending on its nature, accumulated dark matter may affect the properties of neutron stars in quite different ways. I will give an overview of the impact of dark matter on various observable properties of neutron stars, i.e. the mass-radius relation, tidal deformability, merger dynamics, gravitational waveform, thermal evolution, etc. For two scenarios, asymmetric fermionic and bosonic dark matter, the conditions at which dark matter particles tend to condense in the core of the star or create an extended halo will be presented. I will show how dark matter condensed in a core tends to decrease the total gravitational mass and tidal deformability compared to a pure baryonic star, which appears as an effective softening of the equation of state. On the other hand, the presence of a dark matter halo has the opposite effect, causing an increase in those observable quantities. Thus, observational data on compact stars could be affected by accumulated dark matter and, consequently, constraints we put on the strongly interacting matter at high densities. In addition, I will review the effect of dark matter on binary neutron star mergers and emitted gravitational wave signals. I will present the numerical-relativity simulations of compact stars admixed with the dark matter component and discuss how the present and next-generation gravitational wave telescopes could shed light on dark matter-admixed compact stars and constrain the dark matter properties. Zoom link:https://huji.zoom.us/j/81242934336?pwd=2puAP9OI955t42QYv7a6jyVDUeFaR8.1 Meeting ID: 812 4293 4336 Passcode: 970575 Contact: Dima Ofengeim
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