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Aktuelle Veranstaltungen

 

Kolloquium

Thema:

tba

Datum:

08.05.17

Uhrzeit:

16:15

Ort:

H6

Vortragender:

Dr. Tobias Kampfrath

Fritz Haber Institut and FU Berlin

Inhalt:

Ansprechpartner:

M. Meinert

Kolloquium Mathematische Physik

Thema:

tba

Datum:

21.04.17

Uhrzeit:

16:15

Ort:

V2-210/216

Vortragender:

Yan Fodorov

King's College London

Inhalt:

Ansprechpartner:

G. Akemann

Seminar Hochenergiephysik

Thema:

tba

Datum:

04.04.17

Uhrzeit:

14:15

Ort:

D6-135

Vortragender:

Benedikt Kalus

Portsmouth

Inhalt:

Ansprechpartner:

D. Schwarz

Seminar Kondensierte Materie

Thema:

Connecting Spin Hamiltonians from DFT Calculations to Experiment

Datum:

06.04.17

Uhrzeit:

14:15

Ort:

D5-153

Vortragender:

Shadan Ghassemi

TU Berlin

Inhalt:

Ansprechpartner:

Jürgen Schnack

Seminar Mathematische Physik

Thema:

Induced QCD

Datum:

02.02.17

Uhrzeit:

16:00

Ort:

D5-153

Vortragender:

Robert Lohmeyer

University of Regensburg

Inhalt:

We explore an alternative discretization of continuum SU(Nc) Yang-Mills theory on a Euclidean spacetime lattice, originally introduced by Budzcies and Zirnbauer. In this discretization the self-interactions of the gauge field are induced by a path integral over Nb auxiliary boson fields, which are coupled linearly to the gauge field. The main progress compared to earlier approaches is that Nb can be as small as Nc. In the main part of this talk we (i) extend the proof that the continuum limit of the new discretization reproduces Yang-Mills theory in two dimensions from gauge group U(Nc) to SU(Nc), (ii) derive refined bounds on Nb for non-integer values, and (iii) perform a perturbative calculation to match the bare parameter of the induced gauge theory to the standard lattice coupling. Furthermore, we will present some numerical evidence in support of the conjecture that the induced gauge theory reproduces Yang-Mills theory also in more than two dimensions.

Ansprechpartner:

Gernot Akemann

Seminar AG Zufallsmatrizen

Thema:

Matrix product ensembles of Hermite-type

Datum:

26.04.17

Uhrzeit:

16:15

Ort:

V3-201

Vortragender:

Dang-Zheng Liu

Institute of Science and Technology Austria & University of Science and Technology of China

Inhalt:

We investigate spectral properties of a Hermitised random matrix product which, contrary to previous product ensembles, allows for eigenvalues on the full real line. We find an explicit expression of the joint probability density function as a bi-orthogonal ensemble. As an interesting example, we focus on the product of GUE and LUE matrices and provide explicit expressions both for the bi-orthogonal functions and the correlation kernel. Then a new double-side kernel is found at the origin, which is slightly different from the Bessel kernel. This talk is based on joint work with P. J. Forrester and J. R. Ipsen.

Ansprechpartner:

Gernot Akemann



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  • | Letzte Änderung: 23.11.2011
  •  Olaf Kaczmarek
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