Institut für Theoretische Physik
Start / Aktuell
Januar  2015
Bibliothek des Physiologischen Instituts, Humboldtallee 23, 37073 Göttingen
Nichtlineare Dynamik
AG-Seminar: MPI für Dynamik und Selbstorganisation - Bernstein Center for Computational Neuroscience/ Bernstein Focus Neurotechnology

Prof. Dr. Michele Migliore
Institute of Biophysics, National Research Council, Palermo, Italy

Self-organization of microcircuits in a brain system

The functional operations of neuron microcircuits, involved with higher brain functions, require a continuous self-organization of the underlying synaptic network that is extremely difficult to explore experimentally. In the olfactory bulb system, recent experimental evidence suggests that odor processing before cortical action is organized in well-defined, sparse, and segregated synaptic clusters. The observed columnar organization of these clusters can emerge from the interaction among odor inputs, action potential backpropagation in the mitral cell lateral dendrites, and dendrodendritic mitral-granule cell synapses. In this talk, I will first discuss how the feedback and lateral inhibitory action of the clusters can explain the experimentally-observed firing dynamics of mitral cells during sniffs of different odors. Then, using our latest large-scale 3D model of the olfactory bulb microcircuit and a novel theoretical approach, I will discuss the mechanisms and requirements for forming one or more glomerular units in response to a given odor; how and to what extent the glomerular units interfere or interact with each other during learning; their computational role within the olfactory bulb microcircuit; and how their action can be formalized into a theoretical framework in which the olfactory bulb can be considered to contain “odor operators” unique to each individual. The results provide new and specific theoretical and experimentally testable predictions.

MPS - Auditorium
MPI für Sonnensystemforschung

Thomas Gastine

Explaining Jupiter's internal dynamics

Spacecraft data reveal a very Earth-like Jovian magnetic field. This is surprising since numerical models have shown that the vastly different interiors of terrestrial and gas planets can strongly affect the internal dynamo process. Here we present the first numerical dynamo that manages to match the structure and strength of the observed magnetic field by embracing the newest models for Jupiter¹s interior. Simulated dynamo action primarily occurs in the deep high electrical conductivity region, while zonal flows are dynamically constrained to a strong equatorial jet in the outer envelope of low conductivity. Our model reproduces the structure and strength of the observed global magnetic field and predicts that secondary dynamo action associated to the equatorial jet produces banded magnetic features likely observable by the Juno mission.

Kontakt: Urs Mall
Sitzungssaal Mathematik
Theoretische Physik

The cobordism hypothesis classifies fully local topological field theories. It is an open problem to realize quantum Chern-Simons theory as a fully local field theory in this sense. I show how classical Chern-Simons theory and its "pre-quantization" (in the sense of geometric quantization) has a fully local incarnation, and how it implies the need to cancel the quantum anomaly by means of "p1-structure" (Atiyah 2-framings). I close with an outlook on how this could be used to get the fully local quantum theory.

Kontakt: K.-H. Rehren
Seminarraum 4, C4.101
SFB 1073
SFB Seminar

Dr. Dirk Weiss
First Solar, Santa Clara, Kalifornien

Introduction to First Solar Technology

First Solar began in 1999 as a high-tech startup with a disruptive, very low-cost thin-film solar technology that is ideally suited for utility-scale power plants in hot, sunny environments. Today, First Solar is multi-billion US-dollar company, with over 10GW of total installed capacity worldwide. In my talk I will give an overview of First Solar’s history, CdTe module technology, powerplant designs, and market segments. I will discuss utility-scale photovoltaic energy cost in comparison to conventional energy sources. CdTe has unique performance attributes which I will explain and compare to the case of multicrystalline silicon.

Kontakt: Cynthia Volkert
Seminarraum 11, C3.101
SFB 1073
SFB Seminar

Dr. Vladimir Roddatis
Universität Göttingen, Materialphysik

TEM study of atomic structure and chemical composition of materials for energy conversion

Transmission electron microscopy is a powerful tool to investigate the structure and chemical composition of materials at atomic scale. In the first part of talk we will present some recent results on ex- and in-situ lithiation of silicon. Second part will be focused on structural and chemical analysis of LaMnO3/SrMnO3 multilayer system. Important aspects of specimen preparation and analysis of results will be discussed.

Februar  2015
Max-Born-Hörsaal (HS2), Friedrich-Hund-Platz 1
Fakultät für Physik
Göttinger Physikalisches Kolloquium

Prof. Dr. Wilfried Buchmüller
Center for Free-Electron Laser Science Hamburg

The Cosmic Microwave Background and the Unification of Forces

The recently observed B-mode polarization in the cosmic microwave background is a possible signal for gravitational waves produced during inflation. This would imply an inflationary energy density corresponding to the mass scale where weak, electromagnetic and strong interactions have equal strength. We discuss the implications of these results for particle physics, together with theoretical predictions for upcoming experiments.

Aula am Wilhelmsplatz
Fakultät für Physik

Prof. Eberhard Umbach

Energiewende - Chancen und Risiken

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Last modified: Mon Mar 5 10:17:50 CET 2012