HEP – GR Seminar

Dr. D. Cadamuro
Prof. S. Hollands
Prof. R. Verch


Dr. A. Much

Dr. J. Zahn

Monday, 15:15 – 16:45 (1 hour talk, followed by questions), seminar room 114 ITP
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This term, the seminar is held in a  virtual meeting room  (Passcode: 566288).


Schedule for the summer term 2021:

Date Speaker Title (hover/click for abstract)
19.04. Gerardo Morsella (Università di Roma)
26.04. Lucietti James (University of Edinburgh)
03.05. Fábio Novaes (University of Valdivia)
10.05. Marco Merkli (Memorial University of Newfoundland) 
17.05. Alessio Ranallo (University of Rome Tor Vergata)
31.05. Leon Deryck Loveridge (University of South-Eastern Norway) 
14.06. Markus Fröb (University of Leipzig)
21.06. Mark M. Wilde (Louisiana State University)

Schedules of past terms:

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Abstract: Local QFT on Doplicher-Fredenhagen-Roberts quantum spacetime is equivalent to a non-local QFT on ordinary (commutative) spacetime, which has quite generally a better UV behavior in perturbation theory, but for which the control of the adiabatic limit is problematic. I will show that the adaptation of the methods of perturbative QFT, originally developed for local QFT on ordinary spacetimes, to QFT on quantum spacetime yields a non-local UV-finite theory which enjoys some remnants of causality. This is sufficient to prove the existence of the adiabatic limit of vacuum expectation values of interacting observables. (Joint work with S. Doplicher and N. Pinamonti.)
Abstract: The classification of stationary black hole solutions is a major open problem in higher-dimensional General Relativity. I will report on recent progress towards this problem for five-dimensional, asymptotically flat, vacuum black holes with biaxial symmetry. It is well known that the Einstein equations for this class of spacetimes arise as the integrability condition of an auxiliary linear system. I will show that the general solution to the Belinski-Zakharov linear system on the axes and horizons determines the metric data there in terms of a set of moduli that must satisfy certain algebraic equations. In particular, this is sufficient to determine the moduli space of solutions that are free of conical singularities on the axes.  As examples, we obtain constructive uniqueness proofs for the Myers-Perry black holes and the known doubly spinning black rings. We also use this method to demonstrate the nonexistence of the simplest class of black holes with lens space horizon topology.