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Colloquium

Topic:

Der neue Bielefelder GPU-Cluster

Date:

20.05.19

Time:

16:00

Place:

H6

Guest:

Gert Aarts, Swagato Mukherjee and Kevin Tierney

Abstract:

Contact person:

F. Karsch

Colloquium Mathematical Physics

Topic:

The Widom-Rowlinson model: metastability, mesoscopic and microscopic fluctuations for the critical droplet

Date:

24.05.19

Time:

16:15

Place:

V3-204

Guest:

Elena Pulvirenti

University of Bonn

Abstract:

In this talk I will discuss the Widom-Rowlinson model on a finite two dimensional torus subject to a stochastic dynamics in which particles are randomly created and annihilated inside the torus according to an infinite reservoir with a given chemical potential. We are interested in the metastable behaviour of the system at low temperature when the chemical potential is supercritical. In particular, we compute the asymptotics of the average time the system needs to condensate and we describe the shape of the critical droplet. Our results rely on a precise analysis of the microscopic and mesoscopic fluctuations of the surface of the critical droplet. This is a joint work in progress with F. den Hollander, S. Jansen, R. Kotecky.

Contact person:

M. Baake

Seminar High Energy Physics

Topic:

The road to QUDA 1.0

Date:

21.05.19

Time:

14:15

Place:

D6-135

Guest:

Matthias Wagner

NVIDIA Würselen

Abstract:

Eleven years after its inception, the QUDA library for Lattice QCD on NVIDIA GPUs is nearing a historic 1.0 release. In this span, QUDA has evolved into an open-source framework for full QCD simulations. The library has been fully re-written in a new highly optimized C++11 framework, superseding python-generated routines and ushering in a new age of rapid algorithm prototyping and development. It supports nearly all fermion discretizations, features cutting-edge algorithms such as adaptive multigrid, deflation, and block Krylov-space methods, and contains native support for mixed precision and symmetry-inspired data compression. In preparation for the exascale era, the ability to strong scale is crucial for Lattice QCD simulations. We will discuss the techniques that QUDA implements to achieve the best scaling with MPI and novel improvements using NVSHMEM for GPU-centric communication.

Contact person:

O. Kaczmarek

Seminar Condensed Matter

Topic:

Matrix product states and matrix product operators

Date:

13.06.19

Time:

14:15

Place:

D5-153

Guest:

Murod Bahohavinov

Bielefeld University

Abstract:

Contact person:

Jürgen Schnack

Seminar Mathematical Physics

Topic:

Critical behaviour and characteristic polynomials of non-Hermitian random matrices

Date:

23.05.19

Time:

16:15

Place:

D5-153

Guest:

Nicholas Simm

University of Sussex

Abstract:

I will discuss some recent developments regarding the normal matrix model. In particular my interest will be in certain critical models where the limiting support of the eigenvalues can radically change its topology by slightly adjusting an external parameter. I will discuss how aspects of the model can be explicitly mapped to the study of expectations of characteristic polynomials of non-Hermitian random matrices (e.g. Ginibre or truncated unitary). Many of these averages are related to Painlevé transcendents, and by exploiting this, a precise and non-trivial asymptotic expansion of partition functions can be calculated in the critical models. This is joint work with Alfredo Deaño (University of Kent).

Contact person:

Gernot Akemann

Seminar AG Zufallsmatrizen

Topic:

tba

Date:

23.05.19

Time:

16:15

Place:

V3-201

Guest:

Nick Simm

University of Sussex

Abstract:

Contact person:

Gernot Akemann



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  • | Letzte Änderung: 23.11.2011
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