Thema: 
Properties of strongly interacting matter from first principles 
Datum: 
11.12.17 
Uhrzeit: 
16:15 
Ort: 
H6 
Vortragender: 

University of Houston 

Inhalt: 
Quantum Chromodynamics (QCD) is the fundamental theory describing the interactions between the ultimate building blocks of matter, namely quarks and gluons. At temperatures as high as trillions of degrees Kelvin and zero net baryon density, first principle Lattice QCD calculations have shown that a smooth crossover transition occurs between hadronic matter and a new state of matter called the quarkgluon plasma. A remaining question in QCD is whether criticality may appear at large baryon densities. In this talk I will review the status of lattice QCD simulations of strongly interacting matter at zero and finite density. I will then discuss novel stringtheorybased theoretical developments that have been used to search for the QCD critical point. These theoretical models can provide conclusive signatures for the presence of the QCD critical point, which can be experimentally verified in relativistic heavy ion collisions at Brookhaven National Laboratory. 
Ansprechpartner: 
Thema: 
Mesoscopic eigenvalue correlations of random matrices 
Datum: 
01.12.17 
Uhrzeit: 
16:00 
Ort: 
V2210/216 
Vortragender: 
Antti Knowles 
University of Geneva 

Inhalt: 
Ever since the pioneering works of Wigner, Gaudin, Dyson, and Mehta, the correlations of eigenvalues of large random matrices on short scales have been a central topic in random matrix theory. On the microscopic spectral scale, comparable with the typical eigenvalue spacing, these correlations are now well understood for Wigner matrices thanks to the recent solution of the WignerGaudinDysonMehta universality conjecture. In this talk I focus on eigenvalue densitydensity correlations between eigenvalues whose separation is much larger than the microscopic spectral scale; here the correlations are much weaker than on the microscopic scale. I discuss to what extent the WignerGaudinDysonMehta universality remains valid on such larger scales, for Wigner matrices and random band matrices. 
Ansprechpartner: 
Thema: 
Production of charm quarks in relativistic heavy ion collisions using parton cascade model 
Datum: 
19.12.17 
Uhrzeit: 
14:15 
Ort: 
D6135 
Vortragender: 

Kolkata, India 

Inhalt: 
We discuss extension of parton cascade model proposed earlier to include production and propagation of charm quarks in relativistic heavy ion collision at RHIC energies. We find additional production of charms having low transverse momenta due to multiple scattering among partons and suppressed production of charm quarks having large transverse momenta due to collisions and radiation of gluons. Applying the treatment to pp collisions at LHC energies, we find a large production of charm quarks and strangeness equilibration in events with large multiplicity. 
Ansprechpartner: 
Thema: 
Lateral trapping of DNA inside a voltage gated nanopore 
Datum: 
30.11.17 
Uhrzeit: 
14:15 
Ort: 
D5153 
Vortragender: 
Thomas Toews 
Bielefeld University 

Inhalt: 

Ansprechpartner: 
Thema: 
CFT and SLE in a doubly connected domain 
Datum: 
09.11.17 
Uhrzeit: 
16:00 
Ort: 
D5153 
Vortragender: 
Sungsoo Byun 
Seoul National University 

Inhalt: 
In this talk, I will present certain implementations of conformal field theory (CFT) in a doubly connected domain. The statistical fields in these implementations are generated by central charge modifications of the Gaussian free field with excursion reflected/Dirichlet boundary conditions. I will explain Ward's equation in terms of a stress energy tensor, Lie derivative operators and the modular parameter. Combining Ward's equation with the level 2 degeneracy equation for the boundary condition changing operator, I will outline the relation between CFT and SchrammLoewner Evolution (SLE) theory. As applications, I will present a version of restriction property and FriedrichWerner’s formula for annulus SLE and explain how to apply the method of screening to find explicit solutions of the partial differential equations for the annulus SLE partition functions introduced by Lawler and Zhan. This is based on joint work with NamGyu Kang and HeeJoon Tak. 
Ansprechpartner: 
Thema: 
On the extreme value statistics of normal random matrices 
Datum: 
13.12.17 
Uhrzeit: 
14:15 
Ort: 
V3201 
Vortragender: 
Rouhollah Ebrahimi 
Pontificia Universidade Catolica do Rio de Janeiro Rio de Janeiro 

Inhalt: 
In this work, we extend the approach of orthogonal polynomials for extreme value calculations of Hermitian random matrices, developed by Nadal and Majumdar, to normal random matrices and 2D Coulomb gases in general. Firstly, we show that this approach provides an alternative derivation of results in the literature. More precisely, we show convergence of the rescaled eigenvalue with largest modulus of a Ginibre ensemble to a Gumbel distribution, as well as universality for an arbitrary radially symmetric potential. Secondly, it is shown that this approach can be generalised to obtain convergence of the eigenvalue with smallest modulus and its universality for ring distributions. Furthermore, the here presented techniques can be used to compute finite N expressions of the above distributions, which is important for practical applications, given the slow convergence. One interesting aspect of this work is the fact that we can use standard techniques from Hermitian random matrices to obtain the extreme value statistics of nonHermitian random matrices. Furthermore, the calculation resembles the large N expansion used in context of the double scaling limit of Hermitian matrix models in string theory. 
Ansprechpartner: 