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UID:10002824-1699534800-1699538400@cmsa.fas.harvard.edu
SUMMARY:Nuclear chromodynamics: non-equilibrium phase transition in the nucleus of a living cell
DESCRIPTION:Active Matter Seminar\n\n\nSpeaker: Alexander Grosberg (NYU)\n\nTitle: Nuclear chromodynamics: non-equilibrium phase transition in the nucleus of a living cell \nAbstract: Nucleus of a living cell houses a cell genome – a polymer called chromatin\, which is a functional form of DNA.  It is very long\, e.g.\, 2 meters long for every human cell.  Nucleus is also an arena of incessant energy-driven activity.  Experiments show that chromatin undergoes large scale motions sustained over long times of order seconds.  In the talk\, after reviewing the phenomenology\, I will show how these flows may arise due to a phase transition in which chromatin-driving motors\, such as RNA polymerase\, form a polar (“ferromagnetic”) order controlled by hydrodynamic interactions.  The talk is based on the joint work with I.Eshghi and A.Zidovska.
URL:https://cmsa.fas.harvard.edu/event/am-11923/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Active Matter Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Active-Matter-Seminar-11.09.23.png
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DTSTART;TZID=America/New_York:20231109T163000
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SUMMARY:Uniqueness of Landau levels and their analogs with higher Chern numbers
DESCRIPTION:Topological Quantum Matter Seminar \nSpeaker: Bruno Mera\, Instituto Superior Tecnico \nTitle: Uniqueness of Landau levels and their analogs with higher Chern numbers \nAbstract: Lowest Landau level wavefunctions are eigenstates of the Hamiltonian of a charged par- ticle in two dimensions under a uniform magnetic field. They are known to be holomorphic both in real and momentum spaces\, and also exhibit uniform\, translationally invariant\, geometrical properties in momentum space. In this talk\, using the Stone-von Neumann the- orem\, we show that lowest Landau level wavefunctions are indeed the only possible states with unit Chern number satisfying these conditions. We also prove the uniqueness of their direct analogs with higher Chern numbers and provide their expressions. \nRef: Bruno Mera and Tomoki Ozawa. Uniqueness of Landau levels and their analogs with higher Chern numbers. arXiv:2304.00866\, 2023. arXiv:2304.00866. \n 
URL:https://cmsa.fas.harvard.edu/event/tqms_11823/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Topological Quantum Matter Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Topological-Seminar-11.09.23.png
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