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DTSTART;TZID=America/New_York:20221020T103000
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SUMMARY:Love Symmetry of Black Holes
DESCRIPTION:General Relativity Seminar \nSpeaker: Sergei Dubovsky (New York University)\n\n\n\nTitle: Love Symmetry of Black Holes\n\n\nAbstract: Perturbations of massless fields in the Kerr-Newman black hole background enjoy a (“Love”) SL(2\,ℝ) symmetry in the suitably defined near zone approximation. We show how the intricate behavior of black hole responses in four and higher dimensions can be understood from the SL(2\,ℝ) representation theory. In particular\, static perturbations of four-dimensional black holes belong to highest weight SL(2\,ℝ) representations. It is this highest-weight property that forces the static Love numbers to vanish. We show that the Love symmetry is tightly connected to the enhanced isometries of extremal black holes. The Love symmetry also exhibits a peculiar UV/IR mixing.
URL:https://cmsa.fas.harvard.edu/event/gr_102022/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:General Relativity Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-GR-Seminar-10.20.22.png
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DTSTART;TZID=America/New_York:20221020T120000
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SUMMARY:Attempts at understanding human axial elongation and patterning
DESCRIPTION:Active Matter Seminar\n\n\n\n\nSpeaker: Sharad Ramanathan\, Harvard\n\n\nTitle: Attempts at understanding human axial elongation and patterning\n\nAbstract: Some of the most dramatic events during human development is the axial elongation of the embryo with concomitant changes in the geometry and composition of the underlying tissues. The posterior part of the embryo gives rise to the spinal cord\, vertebral column\, ribcage\, back muscles\, and dermis.  In this talk\, I will present our attempts at coaxing human embryonic stem cells to form these structures of the early human embryo that closely recapitulate the geometry\, relative arrangements\, composition\, and dynamics of development of the early spinal cord flanked progenitors of the musculoskeletal system. Our goal was to do so\, such that we could build hundreds of these organoids at a time. I will also present preliminary results for the use of this system to understand key events during early human development through imaging and genetic perturbations.
URL:https://cmsa.fas.harvard.edu/event/am-4/
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-10.20.22.png
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