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Physik-Combo

27–29 Sept 2021
Europe/Berlin timezone

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Contribution List

16 out of 16 displayed
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  1. 1. Welcome address
    27/09/2021, 10:55
  2. 3. An introduction to tensor networks for describing strongly correlated quantum many-body systems I
    Prof. Frank Verstraete (Ghent University)
    27/09/2021, 11:00
  3. 4. Charged quantum fields inside black holes
    Christiane Klein (ITP Leipzig)
    27/09/2021, 13:45

    The strong cosmic censorship conjecture states that black hole spacetimes cannot be continued beyond their inner horizon due to the divergence of local observables, such as the stress-energy tensor of a classical or quantum scalar field, at that horizon. In the case of a spherically symmetric, charged black hole, numerical and analytical studies indicate, that this conjecture is violated...

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  4. 5. Quantum energy inequalities and integrable quantum field theories
    Jan Mandrysch (ITP Leipzig)
    27/09/2021, 14:15

    Many results in general relativity rely crucially on classical energy conditions inflicted on the stress-energy tensor. Quantum matter, however, violates these conditions since its energy density can become arbitrarily negative at a point. Nonetheless quantum matter should have some reminiscent notion of stability, which can be captured by the so-called quantum (weak) energy inequalities...

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  5. 6. An introduction to tensor networks for describing strongly correlated quantum many-body systems II
    Prof. Frank Verstraete (Ghent University)
    27/09/2021, 15:30
  6. 8. A rigorous derivation of the functional renormalisation group equation
    Jobst Ziebell (TPI Jena)
    28/09/2021, 09:15

    The functional renormalisation group equation is derived in a mathematically rigorous fashion in a framework suitable for the Osterwalder-Schrader formulation of quantum field theory. To this end, we devise a very general regularisation scheme and give precise conditions for the involved regulators guaranteeing physical boundary conditions. Furthermore, it is shown how the classical limit is...

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  7. 9. Asymptotically safe Einstein Palatini gravity
    Mr Abdol Sabor Salek (TPI Jena)
    28/09/2021, 09:45

    The Einstein-Palatini formulation of gravity treats the metric and the connection as independent degrees of freedom. The most general extension on the level of the Einstein-Hilbert action equips the connection with a U(1)-symmetric vector field as an addition to the conventional Levi-Cevita connection. Making a scale-dependant analysis within the Asymptotic Safety scenario of quantum gravity...

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  8. 11. An introduction to tensor networks for describing strongly correlated quantum many-body systems III
    Prof. Frank Verstraete (Ghent University)
    28/09/2021, 11:00
  9. 12. Inti Sodemann
    28/09/2021, 13:45
  10. 13. Gravitational Waves from Black hole - Neutron Stars
    Alejandra Gonzalez
    28/09/2021, 15:30

    Since the first observation of a GW from a binary black hole in 2015, many more have been observed in recent years. GW astronomy provides us with a powerful tool to do science through the information we can get from their detection in interferometers. Most recently, GWs from black hole - neutron star mergers have been observed for the first time. These coalescences are promising candidates to...

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  11. 15. Constraints on nuclear equations of state from binary neutron star mergers
    Matteo Breschi (FSU Jena)
    28/09/2021, 16:00

    Multi-messenger observations of binary neutron star mergers can provide essential information on the properties of the nuclear equation of state of these compact objects. We perform Bayesian inference on GW170817 and its kilonova counterpart AT2017gfo, constraining the radius of a neutron star of 1.4 M⊙ to 12.2±0.5 km (1σ level). Furthermore, we show how post-merger gravitational-waves can...

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  12. 24. Prompt Collapse in Binary Neutron Star Mergers: The Effect of the Mass Ratio
    Maximilian Kölsch (TPI Jena)
    28/09/2021, 16:30

    The outcome of a binary neutron star merger dominantly depends on the total mass of the system and the equation of state describing the matter. However, the mass ratio also influences the postmerger evolution, in particular, whether there is a prompt or delayed collapse. Furthermore, the mass ratio influences which fraction of the initial baryonic mass ends up in a disc around a so formed...

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  13. 17. Dualities in one and two-dimensional quantum systems
    Prof. David Mross (Weizmann Institute)
    29/09/2021, 09:00
  14. 18. Core collapse in scalar-tensor theory with massive fields
    Roxana Rosca-Mead (TPI, University of Jena)
    29/09/2021, 11:15

    Though General Relativity has been successfully tested so far, concepts such as dark energy and string theory suggest the need of modifying it. Scalar-tensor theory is one of the most popular alternatives discussed. The key motivation for looking at the ones with massive fields is that they are far less constrained by binary pulsar observations, in contrast to the massless case. In this talk,...

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  15. 23. Student & PI Meeting
    29/09/2021, 13:45
  16. 20. Topology vs. interaction: the strong, the weak and the fragile
    Prof. Ady Stern (Weizmann Institute)
    29/09/2021, 15:30

    Topological systems of non-interacting electrons may be forced by their topological nature to have a gapless spectrum. As two examples, Integer quantum Hall states and topological insulators must carry gapless edge states, which allow them to carry current. Whether interaction between the electrons may turn a gapless conductor into a fully gapped insulator depends on the case at hand, with a...

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