BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CMSA - ECPv6.15.17//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:CMSA
X-ORIGINAL-URL:https://cmsa.fas.harvard.edu
X-WR-CALDESC:Events for CMSA
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:America/New_York
BEGIN:DAYLIGHT
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
TZNAME:EDT
DTSTART:20220313T070000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
TZNAME:EST
DTSTART:20221106T060000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
TZNAME:EDT
DTSTART:20230312T070000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
TZNAME:EST
DTSTART:20231105T060000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
TZNAME:EDT
DTSTART:20240310T070000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
TZNAME:EST
DTSTART:20241103T060000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230330T093000
DTEND;TZID=America/New_York:20230330T223000
DTSTAMP:20260405T013516
CREATED:20230818T042141Z
LAST-MODIFIED:20240118T101402Z
UID:10001258-1680168600-1680215400@cmsa.fas.harvard.edu
SUMMARY:Gravitational perturbations near to extreme Kerr
DESCRIPTION:General Relativity Seminar \nSpeaker: Alejandra Castro (University of Cambridge) \nTitle: Gravitational perturbations near to extreme Kerr \nAbstract: Gravitational perturbations of a black hole illustrate the invaluable synergy between theory\, experiment\, and numerical simulations in general relativity. A recent development in the theory side has been the identification of the relevant degrees of freedom describing the low energy physics driving a black hole away from extremality.  For simple cases\, this low energy sector determines important aspects of the gravitational backreaction\, and several properties that are key to our microscopic (quantum) understanding of black hole physics.\n\nIn this talk I will discuss these developments in the context of the (near-)extreme Kerr black hole. In particular\, I will revisit the spectrum of linear axisymmetric gravitational perturbations of this black hole. The aim is to characterise those perturbations that are responsible for the deviations away from extremality\, and to contrast them with the linearized perturbations treated in the Newman-Penrose formalism. I will show that for Kerr the low-lying mode sector is subtle and intricate—features that their charged spherical symmetric cousins do not display. This unveils new clues on how to decode a microscopic\, and holographic\, understanding of the Kerr black hole.
URL:https://cmsa.fas.harvard.edu/event/gr_33023/
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-03.30.23.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230330T130000
DTEND;TZID=America/New_York:20230330T140000
DTSTAMP:20260405T013516
CREATED:20230824T182516Z
LAST-MODIFIED:20240228T084556Z
UID:10002748-1680181200-1680184800@cmsa.fas.harvard.edu
SUMMARY:The Role of Orientational Order in Development
DESCRIPTION:Active Matter Seminar\n\n\nSpeaker: Mark Bowick\, Kavli Institute for Theoretical Physics\, UCSB \nTitle: The Role of Orientational Order in Development \nAbstract: Morphogenesis\, the process through which genes generate form\, establishes tissue scale order as a template for constructing the complex shapes of the body plan. The extensive growth required to build these ordered substrates is fueled by cell proliferation\, which\, naively\, should disrupt order. Understanding how active morphogenetic mechanisms couple cellular and mechanical processes to generate order remains an outstanding question in animal development. I will review the statistical mechanics of orientational order and discuss the observation of a fourfold orientationally ordered phase (tetratic) in the model organism Parhyale hawaiensis. I will also discuss theoretical mechanisms for the formation of orientational order that require both motility and cell division\, with support from self-propelled vertex models of tissue. The aim is to uncover a robust\, active mechanism for generating global orientational order in a non-equilibrium system that then sets the stage for the development of shape and form.
URL:https://cmsa.fas.harvard.edu/event/am-33023/
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-03.30.23.png
END:VEVENT
END:VCALENDAR