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Colloquium

Topic:

tba

Date:

08.05.17

Time:

16:15

Place:

H6

Guest:

Dr. Tobias Kampfrath

Fritz Haber Institut and FU Berlin

Abstract:

Contact person:

M. Meinert

Colloquium Mathematical Physics

Topic:

tba

Date:

21.04.17

Time:

16:15

Place:

V2-210/216

Guest:

Yan Fodorov

King's College London

Abstract:

Contact person:

G. Akemann

Seminar High Energy Physics

Topic:

tba

Date:

04.04.17

Time:

14:15

Place:

D6-135

Guest:

Benedikt Kalus

Portsmouth

Abstract:

Contact person:

D. Schwarz

Seminar Condensed Matter

Topic:

Connecting Spin Hamiltonians from DFT Calculations to Experiment

Date:

06.04.17

Time:

14:15

Place:

D5-153

Guest:

Shadan Ghassemi

TU Berlin

Abstract:

Contact person:

Jürgen Schnack

Seminar Mathematical Physics

Topic:

Induced QCD

Date:

02.02.17

Time:

16:00

Place:

D5-153

Guest:

Robert Lohmeyer

University of Regensburg

Abstract:

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.

Contact person:

Gernot Akemann

Seminar AG Zufallsmatrizen

Topic:

Matrix product ensembles of Hermite-type

Date:

26.04.17

Time:

16:15

Place:

V3-201

Guest:

Dang-Zheng Liu

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

Abstract:

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.

Contact person:

Gernot Akemann



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  • | Letzte Änderung: 23.11.2011
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