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X-WR-CALNAME:Kolleg Mathematik Physik Berlin
X-ORIGINAL-URL:https://kmpb.physik.hu-berlin.de
X-WR-CALDESC:Events for Kolleg Mathematik Physik Berlin
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DTSTART:20260329T010000
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DTSTART;TZID=Europe/Helsinki:20261016T090000
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SUMMARY:KMPB Semester Kick-off & Member's Meeting
DESCRIPTION:The KMPB 2026/27 Winter Semester Kick-Off Meeting will take place on Friday\, 16 October\, from 9:00 to 12:00 in room 1.221 \nSchedule: \n09:00-09:45    Talk by Jan Pulmann – Symplectic geometry behind the Feynman path integral\n09:45-10:30    Talk by Olaf Müller – Extendibility of Black hole spacetimes\n10:30-11:00    Coffee break\n11:00-12:00    KMPB member’s meeting\n12:00-             Optional lunch together \nJan Pulmann – Symplectic geometry behind the Feynman path integral \nAbstract: Classical mechanics is naturally formulated using symplectic geometry\, which is a coordinate-independent way to speak about positions and momenta. It was noticed in the 90’s that one can similarly describe the path integral formulation of quantum field theory; the main difference being that the momenta have opposite statistics. This goes under the name of Batalin-Vilkovisky formalism. I will present the basic ideas of Batalin-Vilkovisky formalism and some of my recent results on effective actions therein. \nOlaf Müller – Extendibility of Black hole spacetimes \nAbstract: A classical result of mathematical general relativity states that the Schwarzschild metric of mass $m$ admits a maximal analytic extension $K_m$ in which the singularity is reached at a finite time and which is not further extendible as a $C^2$ spacetime. I will comment on tweo recent developments on this result: The first is a result by Jan Sbierski stating that the above result holds even in the $C^0$ category\, and second\, a result of mine that $K_m$ is still extendable as a Lorentzian length space. I will also comment on ongoing work with the aim to show that this space is timelike geodesically non-branching\, and on the relevance of that property.
URL:https://kmpb.physik.hu-berlin.de/index.php/event/kmpb-semester-kick-off-members-meeting/
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