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X-FROM-URL:https://eom.sdu.dk/events/ical/98ced991-aa6c-4a11-8392-edda9c94
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X-WR-CALNAME:QM Research Seminar: Topology Change from Pointlike Sources
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TZID:Europe/Copenhagen
X-LIC-LOCATION:Europe/Copenhagen
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DTSTAMP:20260419T021720Z
DTSTART:20261028T030000
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DTSTART:20260325T020000
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DESCRIPTION:[b]Speaker: David O'Connell[/b] (University of Okinawa) [nl]\n
 [b]Abstract:[/b][nl]\nTopology change is typically modelled by a Lorentz 
 cobordism\, which can be seen as a maximal spacelike hypersurface that gl
 obally splits into multiple pieces. In this talk we will take the absolut
 e opposite approach\, and consider models of topology change in which ind
 ividual points are duplicated and then allowed to propagate into an event
 ual cobordism. As we will see\, such models are non-Hausdorff\, with the 
 Hausdorff-violation occurring along the future nullcones of the duplicate
 d points. Using recent developments in non-Hausdorff differential geometr
 y\, we will evaluate the Einstein-Hilbert action on topology changing spa
 cetimes in two dimensions. Interestingly\, even in the case of seemingly-
 flat geometries there will be non-zero curvature contributions coming fro
 m Hausdorff-violating submanifolds that sit inside the spacetime. These o
 bservations suggest that such spacetimes will generally be suppressed in 
 a path integral that sums over topologies\, with more elaborate branching
  receiving a stronger suppression.\n[nl]
DTEND:20231110T110000Z
DTSTAMP:20260419T021720Z
DTSTART:20231110T100000Z
LOCATION:Syddansk Universitet\, Campusvej 55\, 5230\, Odense M
SEQUENCE:0
SUMMARY:QM Research Seminar: Topology Change from Pointlike Sources
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