Name: Physik-Combo
Start: 2021-03-22T08:50:00+01:00
End: 2021-03-24T18:45:00+01:00
Location: No location set

Monday 22 March
- 1
  
  Opening address
  
  Speaker: Holger Gies (TPI, FSU Jena)
- 2
  
  Towards exact FRG flows of a UV-interacting scalar field theory
  
  Speaker: Jobst Ziebell
  
  presentation.pdf
- 3
  
  Towards the characterization of wedge-local observables in integrable models with bound states
  
  We discuss the structure of local observables in 1+1-dimensional quantum integrable models. An important advantage in these models is the existence of an "interacting Fock-space", generated by interacting creation and annihilation operators (so-called Zamolodchikov operators). The observables in question are (usually infinite) series in Zamolodchikov operators with certain functions ("form factors") as coefficients. However, locality of this form factor expansion is hard to establish as convergence of products of expansions is difficult to control. A solution to this problem can be the use of a wedge-local field, i.e., with a weaker localization. This can be expressed as a finite "expansion" in Zamolodchikov operators, taking a form similar to a free field. Making use of this intermediate object, local observables have been characterized in terms of infinite expansions in scalar models without bound states. We present a generalization of this approach to models with bound states
  (e.g., the Bullough-Dodd or Z(N)-Ising model). In these models, the wedge-local field loses its simple "free field like" form due to an additional unbounded term with intricate domain properties. These complications increase in models with composite particles, e.g., the Z(4)-Ising model. Recent advances in this direction are presented.
  
  Speaker: Karim Shedid
  
  KarimShedid-TowardsWedgeLocalObservables-Slides.pdf
- 4
  
  Semi-classical BMS-blocks from the Oscillator Construction
  
  Speaker: Katharina Wölfl
  
  Conformal Blocks with the Oscillator Construction_20210322.pdf
- 10:30
  
  Break
- 5
  
  Spacetime singularities and cosmic censorship I
  
  Speaker: Håkan Andreasson
  
  Physik-Combo-I-210322.pdf
- 6
  
  Lecture Q&A
- 12:15
  
  Break
- 7
  
  Cosmology and Inflation I
  
  Speaker: Enrico Pajer
  
  Live Lectures PhD School.pdf
- 8
  
  Lecture Q&A
- 15:45
  
  Break
- 9
  
  Temperature and entropy-area relation of quantum matter near spherically symmetric outer trapping horizons
  
  Speaker: Fiona Kurpicz
- 10
  
  A regularized perturbative treatment of BRST and Background Effective Action
  
  Speaker: Dimitrios Gkiatas
  
  Combo_Talk_Dimitrios_Gkiatas.pdf
Tuesday 23 March
- 11
  
  Disc of dust: quasi-stationary routes to black holes in Einstein-Maxwell theory
  
  Speaker: David Rumler
  
  Rumler - disc of dust.pdf
- 12
  
  Conservation laws and the Discontinuous Galerkin method
  
  Speaker: Florian Atteneder
  
  presentation.pdf
- 13
  
  Hyperbolic formulations of GR
  
  Speaker: Daniela Cors
- 10:30
  
  Break
- 14
  
  Spacetime singularities and cosmic censorship II
  
  Speaker: Håkan Andreasson
  
  Physik-Combo-II-210323s.pdf
- 15
  
  Lecture Q&A
- 12:15
  
  Break
- 16
  
  Cosmology and Inflation II
  
  Speaker: Enrico Pajer
  
  Live Lectures PhD School 2.pdf
- 17
  
  Lecture Q&A
- 15:45
  
  Break
- 18
  
  What happens at the end of Hawking's evaporation?
  
  There are three distinct regions where quantum gravity becomes non-negligible in a black hole spacetime. I illustrate a number of indications we have about what happens in each of them, coming both from the classical Einstein equations and from loop quantum gravity. These point all to an interesting scenario: long living remnants stabilized by quantum gravity, formed by a large and slowly decreasing interior enclosed into a small anti-trapping horizon. Contrary to what too often stated, the scenario offers also a proof of principle that there is no tension between unitarity and the equivalence principle: the tension comes from postulating a version of holography which is too strong: a fad, for which there is no solid physical evidence.
  
  Speaker: Carlo Rovelli
- 19
  
  Lecture Q&A
Wednesday 24 March
- 20
  
  Spin-foam models of Lorentzian space-time: Emerging geometry at the semiclassical limit
  
  Speaker: José Simao
  
  Talk_notetrad_v2.pdf
- 21
  
  Chiral Spiral for finite number of flavors
  
  Speaker: Michael Mandl
  
  mandl_handout.pdf
- 22
  
  Attenuation of energy relaxation in chiral one-dimensional quantum channels
  
  Speaker: Stefan Georg Fischer
- 10:30
  
  Break
- 23
  
  Spacetime singularities and cosmic censorship III
  
  Speaker: Håkan Andreasson
  
  Physik-Combo-III.pdf
- 24
  
  Lecture Q&A
- 12:15
  
  Break
- 13:30
  
  RTG fellow meeting / RTG PI meeting
- 25
  
  Cosmology and Inflation III
  
  Speaker: Enrico Pajer
  
  Live Lectures PhD School.pdf
- 26
  
  Lecture Q&A
- 15:45
  
  Break
- 27
  
  Combo Colloquium: "What have we learned so far in quantum gravity?"
  
  The problem of quantum gravity is open because we do not have a preferred complete theory that has found direct empirical support. But there is a reliable theory of quantum gravity below the Planckian energy and there are consistent tentative quantum gravity theories; hence quantum theory and general relativity are not incompatible. Furthermore, there are recent empirical observations that disconfirm tentative theories, and there is also a concrete possibility to observe a quantum gravity phenomenon in the lab, in a not too distant future, hence research in quantum gravity is
  connected to observations and experiments.
  
  Speaker: Carlo Rovelli