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Aktuelle Veranstaltungen

 

Kolloquium

Thema:

Multiplexed Optical Imaging by means of Spatial Light Modulators

Datum:

29.05.17

Uhrzeit:

16:15

Ort:

H6

Vortragender:

Prof. Dr. Monika Ritsch-Marte

Medizinische Universität Innsbruck, Department f. Physiologie und Medizinische Physik

Inhalt:

Synthetic holography by means of programmable phase masks on spatial light modulators allows one to create multiplexed holograms. Integrating SLM- wavefront shaping into an optical imaging system, enables multiplexed imaging, where every image consists of sub-images corresponding, for instance, to different depth layers in the imaged object or, in for quantitative phase microscopy, to different parameter settings. Multi-plane imaging and parallelized confocal imaging are used to demonstrate the potential of the approach.

Ansprechpartner:

T. Huser

Kolloquium Mathematische Physik

Thema:

tba

Datum:

02.06.17

Uhrzeit:

16:15

Ort:

V2-210/216

Vortragender:

Stefan Adams

University of Warwick

Inhalt:

Ansprechpartner:

M. Baake

Seminar Hochenergiephysik

Thema:

Possible astrophysical signatures of non-WIMP dark matter candidates

Datum:

30.05.17

Uhrzeit:

14:15

Ort:

D6-135

Vortragender:

Subinoy Das

Indian Institute of Astrophysics, Bangalore

Inhalt:

From cosmological observations we know that DM must display clustering properties similar to CDM, at least on the largest scales. However, the particle nature of DM is still not known. The linear LSS observations, such as WiggleZ, BOSS, and Planck data on CMB temperature and polarization anisotropies can be used to place very stringent constraints on any dark matter models that show deviation from the ?CDM model for k < 0.1 Mpc?1. However, at smaller scales the situation remains unclear from astrophysical observables, e.g. the missing satellite problem, too big to fail problem. This points to a need to study plausible dark matter models that allow for significant deviation from ?CDM models at small scales and confront them with astrophysical and cosmological observables.

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:

Non-orthogonality of eigenvectors from the Haagerup-Larsen theorem

Datum:

01.06.17

Uhrzeit:

16:00

Ort:

D5-153

Vortragender:

Wojciech Tarnowski

Jagiellonian University Krakow

Inhalt:

Biunitarily invariant ensembles have been thoroughly studied in recent years from the point of view of statistics of eigenvalues. An enhanced symmetry of the probability distribution function allows us to expect that all spectral properties will be determined by the singular values only. Indeed, for large matrices, a mapping between one-point densities is known as the Haagerup-Larsen theorem. Recently, this mapping has been extended to all k-point functions (Kieburg-Kösters). During my talk, I will present a recent extension of the Haagerup-Larsen theorem, which gives a simple mapping between the radial spectral cumulative distribution function and a certain one-point eigenvector correlation function, built out of (non-orthogonal) left- and right eigenvectors. I will discuss also its relation with the stability of the spectrum.

Ansprechpartner:

Gernot Akemann

Seminar AG Zufallsmatrizen

Thema:

Nonhermitian Random Matrix Theory and Power Optimization in Random Wireless Networks

Datum:

07.06.17

Uhrzeit:

16:15

Ort:

V3-201

Vortragender:

Aris Moustakas

University of Athens

Inhalt:

Consider a d-dimensional network of transmitters, each sending information to a nearby receiver, while at the same time interfering the reception of the signal at its closest receivers. Each transmitter tries to adjust his power to meet a certain signal to noise-plus-inteference ratio (SINR). If there exists a optimal power vector that satisfies all SINR constraints, power optimization is said to be feasible. In this talk we show that feasibility is related to a random matrix, which is the non-hermitian generalization of the Anderson model with both diagonal and off-diagonal disorder. To study the effects of off-diagonal disorder we take the large-d limit and use the method of hermitization to obtain an asymptotic expression of the corresponding Green function. We also study the randomness of the diagonal elements separately, and show that the limiting form of the Green's function has a form similar to the Coherent Potential Approximation (CPA). We conclude by comparing the resulting optimum average power with simulations.

Ansprechpartner:

Mario Kieburg



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  • | Letzte Änderung: 23.11.2011
  •  Olaf Kaczmarek
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