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Upcoming Events

 

Colloquium

Topic:

Gravitational Wave Astronomy

Date:

30.04.18

Time:

16:15

Place:

H6

Guest:

Prof. Dominik Schwarz

Bielefeld University

Abstract:

The 2017 Nobel Prize in Physics was awarded "for decisive contributions to the LIGO detector and the observation of gravitational waves" back in 2015. Those gravitational waves are believed to origin from a black hole-black hole merger. On October 16, 2017 the LIGO/VIRGO collaboration announced the discovery of a neutron star-neutron star merger, observed simultaneously by means of gravitational waves (GW170817) and as a gamma-ray burst (GRB170817A) and its afterglow across the electromagnetic spectrum. This event marks the beginning of a new era in astronomy and physics: gravitational wave astronomy. This colloquium will provide a brief introduction into the physics of gravitational waves, the interferometric detection technique, and summarise the discoveries so far. Then I will explain how gravitational waves can test general relativity and its alternatives and will explain how, within that day in October 2017, the theoretical community started to realise that the simultaeous observation of a gravitational wave and a gamma-ray burst killed several classes of alternative models of gravity within a few seconds. Finally, I will briefly touch on how the Bielefeld research activities fit it.

Contact person:

D. Schwarz

Colloquium Mathematical Physics

Topic:

tba

Date:

01.06.18

Time:

16:15

Place:

U2-222

Guest:

Ivan Veselic

TU Dortmund

Abstract:

Contact person:

M. Baake

Seminar High Energy Physics

Topic:

tba

Date:

10.07.18

Time:

14:15

Place:

D6-135

Guest:

Jens Mund

UFJF, Juiz de Fora, Brazil

Abstract:

Contact person:

F. Karsch

Seminar Condensed Matter

Topic:

High Spin Cycles: Topping the Spin Record for a Single Molecule verging on Quantum Criticality

Date:

26.04.18

Time:

14:15

Place:

D5-153

Guest:

Jürgen Schnack

Universität Bielefeld

Abstract:

Contact person:

Jürgen Schnack

Seminar Mathematical Physics

Topic:

Eigenvector-related correlation functions and their connection with generalized chiral random matrix ensembles with a source

Date:

11.01.18

Time:

16:00

Place:

D5-153

Guest:

Jacek Grela

LPTMS Université Paris-Sud

Abstract:

We will introduce eigenvector-related correlation functions, discuss briefly their significance in dynamical Ginibre ensemble [1,2] and present asymptotic results in the large matrix size limit. Motivated by recent work [3] on joint eigenvector-eigenvalue correlation function valid for finite matrix size N in the complex and real Ginibre Ensembles, we study integrable structure of a certain generalized chiral Gaussian Unitary Ensemble with a source [4]. This model can be also interpreted as a deformation of the complex Ginibre Ensemble with an external source with additional determinant term. We present compact formulas for the characteristic polynomial, inverse characteristic polynomial and the kernel. In the case of a special source, we calculate asymptotics in the joint "bulk-edge" regime of all aforementioned objects and show their Bessel-type behaviour. References: [1] ''Dysonian dynamics of the Ginibre ensemble'', Z. Burda, J. Grela, M. A. Nowak, W. Tarnowski, P. Warcho?, Phys. Rev. Lett. 113, 104102 (2014) [2] ''Unveiling the significance of eigenvectors in diffusing non-hermitian matrices by identifying the underlying Burgers dynamics'', Z. Burda, J. Grela, M. A. Nowak, W. Tarnowski, P. Warcho?, Nucl. Phys. B 897, 421 (2015) [3] ''On statistics of bi-orthogonal eigenvectors in real and complex Ginibre ensembles: combining partial Schur decomposition with supersymmetry'', Y. V. Fyodorov, arXiv:1710.04699 [4] ''On characteristic polynomials for a generalized chiral random matrix ensemble with a source", Y. V. Fyodorov, J. Grela, E. Strahov, arXiv:1711.07061

Contact person:

Gernot Akemann

Seminar AG Zufallsmatrizen

Topic:

tba

Date:

02.05.18

Time:

16:15

Place:

V3-201

Guest:

Paulino Monroy Castillero

Cuernavaca

Abstract:

Contact person:

Gernot Akemann



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  • | Letzte Änderung: 23.11.2011
  •  Olaf Kaczmarek
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