Opening address

• Holger Gies (TPI, FSU Jena)

Towards exact FRG flows of a UV-interacting scalar field theory

• Jobst Ziebell

Towards the characterization of wedge-local observables in integrable models with bound states

• Karim Shedid

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.

Semi-classical BMS-blocks from the Oscillator Construction

• Katharina Wölfl

Spacetime singularities and cosmic censorship I

• Håkan Andreasson

Lecture Q&A

Cosmology and Inflation I

• Enrico Pajer

Lecture Q&A

Temperature and entropy-area relation of quantum matter near spherically symmetric outer trapping horizons

• Fiona Kurpicz

A regularized perturbative treatment of BRST and Background Effective Action

• Dimitrios Gkiatas

Disc of dust: quasi-stationary routes to black holes in Einstein-Maxwell theory

• David Rumler

Conservation laws and the Discontinuous Galerkin method

• Florian Atteneder

Hyperbolic formulations of GR

• Daniela Cors

Spacetime singularities and cosmic censorship II

• Håkan Andreasson

Lecture Q&A

Cosmology and Inflation II

• Enrico Pajer

Lecture Q&A

What happens at the end of Hawking's evaporation?

• Carlo Rovelli

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.

Lecture Q&A

Spin-foam models of Lorentzian space-time: Emerging geometry at the semiclassical limit

• José Simao

Chiral Spiral for finite number of flavors

• Michael Mandl

Attenuation of energy relaxation in chiral one-dimensional quantum channels

• Stefan Georg Fischer

Spacetime singularities and cosmic censorship III

• Håkan Andreasson

Lecture Q&A

Cosmology and Inflation III

• Enrico Pajer

Lecture Q&A

Combo Colloquium: "What have we learned so far in quantum gravity?"

• Carlo Rovelli

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.