Topic: 
Gravitational Wave Astronomy 
Date: 
30.04.18 
Time: 
16:15 
Place: 
H6 
Guest: 

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 holeblack hole merger. On October 16, 2017 the LIGO/VIRGO collaboration announced the discovery of a neutron starneutron star merger, observed simultaneously by means of gravitational waves (GW170817) and as a gammaray 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 gammaray 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: 
Topic: 
tba 
Date: 
10.07.18 
Time: 
14:15 
Place: 
D6135 
Guest: 
Jens Mund 
UFJF, Juiz de Fora, Brazil 

Abstract: 

Contact person: 
Topic: 
High Spin Cycles: Topping the Spin Record for a Single Molecule verging on Quantum Criticality 
Date: 
26.04.18 
Time: 
14:15 
Place: 
D5153 
Guest: 
Jürgen Schnack 
Universität Bielefeld 

Abstract: 

Contact person: 
Topic: 
Eigenvectorrelated correlation functions and their connection with generalized chiral random matrix ensembles with a source 
Date: 
11.01.18 
Time: 
16:00 
Place: 
D5153 
Guest: 
Jacek Grela 
LPTMS Université ParisSud 

Abstract: 
We will introduce eigenvectorrelated 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 eigenvectoreigenvalue 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 "bulkedge" regime of all aforementioned objects and show their Besseltype 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 nonhermitian 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 biorthogonal 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: 
Topic: 
tba 
Date: 
02.05.18 
Time: 
16:15 
Place: 
V3201 
Guest: 
Paulino Monroy Castillero 
Cuernavaca 

Abstract: 

Contact person: 