We investigate quantum fields far from equilibrium for strongly coupled systems within the AdS/CFT correspondence by mapping strongly coupled quantum field theories to classical supergravity theories.
Using gravitational waves as probes, we study the general relativistic two-body dynamics in the strong field regime and employ this knowledge to constrain fundamental physics of black holes and of extreme matter fields.
Black holes are a fundamental strong field phenomenon of general relativity. Several important features of black holes are known in analytic or semi-analytic form, but many key features, in particular those related to dynamical spacetimes, are only accessible through numerical simulation. The topic of this project is critical phenomena in gravitational collapse in general relativity.
Quantum energy inequalities play an important role in QFT as they are related to the stability of spacetime. In particular, they exclude existence of ``exotic'' spacetime geometries such as wormholes, warp drives and time-machines. We investigate whether Quantum energy inequalities are related to the existence of local thermal equilibrium states and local stability of QFTs.
All visible matter in the universe essentially consists of fermions. The masses of these matter building blocks are largely shaped by critical phenomena such as chiral symmetry breaking. We investigate the interplay between fermionic matter, curved (quantized) spacetime, and corresponding mass generating mechanisms possibly active in the early universe.
QFTs on space(times) with boundaries are relevant in many contexts, e.g., in the Casimir effect, near defects, junctions, interfaces, topological insulators or even spacetime singularities. It is a goal of this project to set up a general theory of renormalization for models of quantum fields in space(times) with boundaries.
Using the "inverse scattering method" - that has been developed in the context of soliton theory and can be applied to the Einstein-Maxwell equations in the presence of two commuting Killing fields - we will study (i) collisions of gravitational and electromagnetic waves and (ii) quasi-stationary routes from "normal" matter configurations to black holes in Einstein-Maxwell theory.
A focus of interest are one-dimensional electron systems out of equilibrium and their relaxation towards (non-)equilibrium steady states. We study interaction quenches in systems of fermions, and focus on entanglement entropy characterizing the approach to late-time behavior.
The Hawking effect, predicting radiation by black holes due to quantum effects and correspondingly black-hole evaporation, features the puzzling scenario called ``information loss paradox''. We study the existence of solutions for evaporating back holes of semiclassical gravity to advance the analysis of thermodynamical properties of quantum fields on black-hole spacetimes and a corresponding entropy concept.
We plan a comprehensive study of the critical behavior, symmetry breaking patters and mass generation in 2 and 3-dimensional fermionic systems (Weyl/Dirac materials) within lattice field theory. Relevant phase transitions are investigated as a function of termperature, density and spacetime curvature.
Biannual transregional training initiative at Jena-Leipzig, providing in-depth research training in topical research areas. The Physik-Combo will be open to students from other locations as well.
Stay tuned for the Combo Kickoff meeting in spring 2020!
quantum field theory, string theory,
general relativity, gravitational waves,
general relativity, gravitational waves,
quantum field theory, critical phenomena,
relativistic astrophysics, gravitational theory,
quantum and lattice field theory,
supersymmetry, quantum fields in curved spacetime
quantum field theory, quantum integrable
systems, quantum energy inequalities
quantum field theory, general relativity,
many-particle systems, quantum
transport, topological phenoma
quantum field theory and gravity, quantum
fields in curved spacetime