Topic: 
tba 
Date: 
01.02.21 
Time: 
16:15 
Place: 
cyberspace 
Guest: 

GoetheUniversität Frankfurt 

Abstract: 

Contact person: 
Topic: 
15/01/2021  TBC 
Date: 
15.01.21 
Time: 
16:15 
Place: 
ZOOM/Konferenzschaltung 
Guest: 

Technical University of Munich 

Abstract: 
TBC 
Contact person: 
Topic: 
Quantum computing quantum field theory problems 
Date: 
15.12.20 
Time: 
14:15 
Place: 
cyberspace 
Guest: 

BNL 

Abstract: 
I will present an overview over the exciting field of quantum computation from a high energy / nuclear theory perspective (No hardware, sorry!). After a brief but pedagogical introduction into the basic concepts, and into some of the interesting physics problems, I will try to explain what “quantum computing” a (lattice) field theory problem actually requires one to do: from digitizing the Hilbert space of ones favorite theory to coming up with an algorithm including preparing states and extracting information by measurement. As an example, I will mostly focus on quantum computation of a dynamical problem (scattering) in scalar phi^4 theory, and will be contrasting the current stateoftheart approach by Jordan, Lee and Preskill with one we are currently developing. I might talk about quantum computation/simulation of gauge theories, if time permits. 
Contact person: 
Topic: 
Evaluation der Genauigkeit des TschebyscheffAlgorithmus zur Bestimmung thermodynamischer Funktionen am Beispiel einer HeisenbergSpinLeiter 
Date: 
11.09.20 
Time: 
14:00 
Place: 
ZOOM / Konferenzschaltung 
Guest: 

Universität Bielefeld 

Abstract: 
Es wird eine Einführung in die numerische Berechnung thermodynamischer Funktionen mithilfe des TschebyscheffAlgorithmus gegeben. Anschließend findet eine Bewertung der Ergebnisse am Beispiel einer HeisenbergSpinLeiter in Abhängigkeit der TschebyscheffParameter statt. 
Contact person: 
Topic: 
Statistics of Extremes in Eigenvaluecounting Staircases 
Date: 
04.06.20 
Time: 
16:00 
Place: 
ZOOM / Konferenzschaltung 
Guest: 

King's College London 

Abstract: 
We consider the counting function (“spectral staircase”) for eigenvalues of a random unitary matrix, drawn from the corresponding betaensemble. Our goal is to characterize the statistics of maximum deviation of this staircase from its mean slope in a fixed interval, when size of the matrix N >>1. We will show that onesided extremes can be addressed by exploiting a mapping onto the statistical mechanics of logcorrelated random processes and using an extended FisherHartwig conjecture. The resulting statistics exhibits combined features of counting statistics of Fermions with Sutherlandtype interaction and extremal statistics of the fractional Brownian motion with Hurst index H = 0. Some of the features are expected to be universal. The talk is based on the paper FyodorovLe Doussal arXiv:2001.04135. 
Contact person: 
Topic: 
The hole event for Gaussian complex zeros and the emergence of quadrature domains 
Date: 
02.12.20 
Time: 
09:00 
Place: 
ZOOM / Konferenzschaltung 
Guest: 

Tel Aviv University 

Abstract: 
The Gaussian Entire Function (GEF) is a distinguished random Taylor series with independent complex Gaussian coefficients, whose zero set is invariant with respect to isometries of the plane. The topic of this talk is the zero distribution of the GEF, conditioned on the event that no zero lies in a given (large) region. For circular holes Ghosh and Nishry observed that as the radius of the hole tends to infinity, the density of zeros vanishes not only on the given hole, but also on an annulus beyond the (rescaled) hole — a 'forbidden region' emerges. We are concerned with the shape of the forbidden region for general simply connected holes. I plan to discuss how one can study this problem through a type of constrained obstacle problem, and why the forbidden region belongs to a class of algebraic domains  the quadrature domains for subharmonic functions. Based on joint work with Alon Nishry. 
Contact person: 