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DTSTART;TZID=America/New_York:20220210T093000
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DTSTAMP:20260602T064921
CREATED:20240304T103339Z
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UID:10002899-1644485400-1644489000@cmsa.fas.harvard.edu
SUMMARY:Dihedral ridigity and mass
DESCRIPTION:Abstract: To characterise scalar curvature\, Gromov proposed the dihedral rigidity conjecture which states that a positively curved polyhedron having dihedral angles less than those of a corresponding flat polyhedron should be isometric to a flat one. In this talk\, we will discuss some recent progress on this conjecture and its connection with general relativity (ADM mass and quasilocal mass).
URL:https://cmsa.fas.harvard.edu/event/2-10-2022-general-relativity-seminar/
LOCATION:MA
CATEGORIES:General Relativity Seminar
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20220217T130000
DTEND;TZID=America/New_York:20220217T140000
DTSTAMP:20260602T064921
CREATED:20240214T075908Z
LAST-MODIFIED:20240304T052235Z
UID:10002574-1645102800-1645106400@cmsa.fas.harvard.edu
SUMMARY:Black Hole dynamics at Large D
DESCRIPTION:Abstract: I demonstrate that black hole dynamics simplifies – without trivializing – in the limit in which the number of spacetime dimensions D in which the black holes live is taken to infinity. In the strict large D limit and under certain conditions I show the equations that govern black hole dynamics reduce to the equations describing the dynamics of a non gravitational membrane propagating in an unperturbed spacetime (e.g. flat space). In the stationary limit black hole thermodynamics maps to membrane thermodynamics\, which we formulate in a precise manner. We also demonstrate that the large D black hole membrane agrees with the fluid gravity map in the appropriate regime.
URL:https://cmsa.fas.harvard.edu/event/2-17-2022-general-relativity-seminar/
LOCATION:MA
CATEGORIES:General Relativity Seminar
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DTSTART;TZID=America/New_York:20220224T130000
DTEND;TZID=America/New_York:20220224T140000
DTSTAMP:20260602T064921
CREATED:20240214T080100Z
LAST-MODIFIED:20240304T051713Z
UID:10002576-1645707600-1645711200@cmsa.fas.harvard.edu
SUMMARY:Extreme Black Holes: Anabasis and Accidental Symmetry
DESCRIPTION:  \n \n  \nSpeaker: Achilleas Porfyriadis\, Harvard Black Hole Initiative \nTitle: Extreme Black Holes: Anabasis and Accidental Symmetry \nAbstract: The near-horizon region of black holes near extremality is universally AdS_2-like. In this talk I will concentrate on the simplest example of  AdS_2 x S^2 as the near-horizon of (near-)extreme Reissner-Nordstrom. I will first explain the SL(2)transformation properties of the spherically symmetric linear perturbations of  AdS_2 x S^2 and show how their backreaction leads to the Reissner-Nordstrom black hole. This backreaction with boundary condition change is called an anabasis. I will then show that the linear Einstein equation near AdS_2 x S^2\, with or without additional matter\, enjoys an accidental symmetry that may be thought of as an on-shell large diffeomorphism of AdS_2.
URL:https://cmsa.fas.harvard.edu/event/2-24-2022-general-relativity-seminar/
LOCATION:Virtual
CATEGORIES:General Relativity Seminar
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