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Calendar of Physics Talks Vienna
| Speaker: | Vishnu Jejjala (University of the Witwatersrand, Johannesburg, South Africa) |
| Abstract: | Non-extremal black holes, which emit thermal Hawking radiation, have two horizons: the event horizon or outer horizon and the Cauchy horizon or inner horizon. Surprisingly, for a broad class of solutions to the Einstein equations, the product of the areas of the inner and outer horizons is the square of the area of the horizon of the zero temperature black hole obtained from taking the smooth extremal limit. We use the attractor mechanism in supergravity to motivate this result. Non-extremal geometries at the Reissner-Nordström point, where the scalar moduli are held fixed, can be lifted to solutions in supergravity with a near-horizon AdS3×S2. These solutions have the same entropy and temperature as the original black hole and therefore allow an interpretation of the underlying gravitational degrees of freedom in terms of CFT2. |
| Date: | Mon, 21.11.2016 |
| Time: | 14:30 |
| Duration: | 60 min |
| Location: | 10th floor seminar room in yellow tower of TU Wien Freihaus (Wiedner Hauptstrasse 8-10, A-1040 Vienna) |
| Contact: | ayan.mukhopadhyay@tuwien.ac.at |
| Surface electrochemistry of platinum single crystals in aqueous solution |
| Speaker: | Prof. Marc Koper (University of Leiden/NL) |
| Abstract: | In this talk I will discuss the interaction and reaction of aqueous electrolyte solution with platinum single-crystal electrodes studied by voltammetry, in situ vibrational spectroscopy, imaging, and theoretical modeling. I will highlight specifically the formation of H, OH, O and other species on the surface, in dependence on surface structure, and compare to similar studies in ultra-high-vacuum. In addition, I will show some unexpected behavior of platinum surfaces at very negative potentials. These insights are crucial for a proper understanding of platinum electrochemistry for the application of platinum in various electrochemical devices. |
| Date: | Mon, 21.11.2016 |
| Time: | 16:00 |
| Location: | Technische Universität Wien, Institut für Angewandte Physik, E134 yellow tower „B“, 5th floor, Sem.R. DB gelb 05 A (room number DB05E11) 1040 Wien, Wiedner Hauptstraße 8-10 |
| Contact: | Univ.Prof. Dr. Ulrike Diebold |
| CoQuS colloquium - Seminar Talk by Carsten Klempt (Leibniz Universität Hannover) |
| Speaker: | Carsten Klempt (CoQuS ) |
| Date: | Mon, 21.11.2016 |
| Time: | 16:30 |
| Location: | Lise Meitner Hörsaal, Strudlhofgasse 4, 1st floor, Vienna |
| Contact: | CoQuS Team |
| Noncommutative spaces and differential geometry |
| Speaker: | Maja Buric (Belgrade Univesity) |
| Abstract: | im Rahmen des Seminars für Mathematische Physik: In the first part of the talk we will discuss the notion of noncommutative spaces from
a physicist's point of view: coherent states, symmetries, differential geometry, gravity
and the classical limit.
In the second part of the talk we will describe some models of noncommutative spaces
which are constructed to be spherically symmetric and curved, in particular, de Sitter space.
|
| Date: | Tue, 22.11.2016 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | S. Fredenhagen, H. Steinacker |
| Functional Antiferromagnetic Materials for Spintronics Applications: Challenge for Ab Initio Computations |
| Speaker: | Privatdoz. Dr. Sergii Khmelevskyi (TU Wien, IAP, Center for Computational Materials Science) |
| Abstract: | With the discovery of the Giant Magneto Resistance (GMR) effect antiferromagnetic
materials became of ultimate importance in modern electronics since they provide a
pining of the ferromagnetic layers. Devices containing these materials are an integral
part of almost any modern computer memories. Due to the recent development of
laser assisted ultrafast switching of the magnetization in ferri- and antiferromagnets
(AFM), new routes for application of spin-orbit coupling effects in spintronics have
been opened. The search of new AFM materials for applications, with stringent
technological requirements on their properties, became main stream in the
developments in magnetic materials science.
In this talk I will give an overview of the subject and illustrate the major role of firstprinciples
modeling in the AFM material development. I will discuss the discovery of
the new high-temperature AF |
| Date: | Tue, 22.11.2016 |
| Time: | 16:00 |
| Location: | Technische Universität Wien, Institut für Angewandte Physik, E134 yellow tower „B“, 5th floor, Sem.R. DB gelb 05 B (room number DB05L03), 1040 Wien, Wiedner Hauptstraße 8-10 |
| Contact: | Ao.Univ.Prof.Dr. Peter Mohn |
| Short-Baseline Neutrino Oscillation Anomalies and Light Sterile Neutrinos |
| Speaker: | Carlo Giunti (INFN, Sezione di Torino) |
| Date: | Tue, 22.11.2016 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, W. Grimus |
| Applied Interface Physics - Understanding Bioadhesion |
| Speaker: | Prof. Dr. Axel Rosenhahn (Analytical Chemistry, Biointerfaces Ruhr, University Bochum/Germany) |
| Abstract: | Tailoring
biointerfaces
to
control
adhesion
requires
a
quantitative
understanding
of
chemical
and
physical
surface
properties
and
the
mechanism
of
the
attachment
process.
To
derive
this
knowledge,
novel
tools
are
desired
to
image
and
probe
the
interaction
of
microorganisms
with
a
surface
in
real
time.
In
the
pedagogical
introductory
part
it
will
be
explained,
how
holography
can
be
used
to
directly
monitor
responses
of
microorganisms
to
surfaces.
The
quantification
of
the
interaction
of
biofilm
formers
with
functionalized
interfaces
by
microfluidic
shear
force
assays
will
be
presented
with
a
focus
on
the
quantitative
nature
of
the
experiment
and
the
possibility
to
extract
the
activation
energies
of
detachment.
X-‐ray
nanoprobe
analysis
at
synchrotron
sources
serves
as
complementary
toolbox
to
shed
light
on
the
attachment
processes,
to
screen
novel
active
coating
ingredients,
and
to
image |
| Date: | Wed, 23.11.2016 |
| Time: | 14:30 |
| Location: | TU Wien Freihaus, 9th floor SemR DB gelb 09 |
| Contact: | Univ.Prof.Dr. Friedrich Aumayr |
| Nuclear Physics of Neutrinos: About double-beta decay and solar neutrinos |
| Speaker: | Prof. Dr. Dieter Frekers (Universität Münster) |
| Abstract: | Double-beta decay is a process, which occurs inside a nucleus, and one of the great challenges is to understand the response of the nuclear many-body system when two neutrons suddenly convert to two protons. This transition is generally described through what is called the “nuclear matrix element (NME)” of double-beta decay, and this quantity directly enters into the decay rates equation. The two-neutrino double-beta decay is a low-momentum transfer phenomenon and the NMEs can be easily measured through charge-exchange reactions. The much more important zero-neutrino double-beta decay is a high-momentum transfer phenomenon and experimentally little is known about the nuclear response. In fact, the present situation of the NMEs for the neutrinoless double-beta decay is profoundly disconcerting.
In this talk...
[ for full abstract please visit: https://indico.smi.oeaw.ac.at/event/210/ ] |
| Date: | Wed, 23.11.2016 |
| Time: | 17:00 |
| Duration: | 60 min |
| Location: | Stefan-Meyer-Institut, Boltzmanngasse 3, 1090 Wien, Seminarraum 3-2-08 (2. Stock) |
| Contact: | Prof. Dr. Eberhard Widmann, Dr. Martin Simon |
| Molecular architectures at the interface: From fundamental surface science to novel functional materials |
| Speaker: | Prof. Dr. Florian Klappenberger (Physics Department E20, TU München, Garching, Germany) |
| Abstract: | Molecule-‐based
nanoarchitectures
play
a
central
role
in
various
field
of
nanotechnology
such
as
OLEDs,
solar
cells,
molecular
electronics,
and
nanophotonics.
Here,
I
report
the
bottom-‐up
construction
of
functional
molecular
nanoarchitectures
under
ultra-‐high
vacuum
conditions
on
well-‐defined
surfaces.
After
acquiring
profound
knowledge
on
the
structural,
chemical
and
electronic
properties
at
the
single-‐molecule
level,
the
main
target
is
the
atom-‐precise
fabrication
of
novel
nanomaterials.
The
necessary
comprehensive
under-‐
standing
is
obtained
by
the
so-‐called
"STM+XS"
approach
combining
scanning
tunneling
microscopy
(STM)
and
X-‐ray
spectroscopy
(XS)
with
density
functional
theory
investigations
and
all-‐atom
molecular
dynamic
simulations.
The
multi-‐technique
methodology
achieves
a
precise
characterization
of
the
fabricated
nanostructures
and
the
underlying
formation |
| Date: | Thu, 24.11.2016 |
| Time: | 08:30 |
| Location: | TU Wien Freihaus Hörsaal 2 Wiedner Hauptstr. 8-10, 2nd floor |
| Contact: | Univ.Prof.Dr. Friedrich Aumayr |
| Speaker: | Daniel Grumiller (TU Vienna) |
| Abstract: | im Rahmen des Literaturseminars der Gravitationsphysik: The notion of "soft hair" refers to zero energy excitations in the near horizon region of black holes or cosmologies, advocated by Hawking, Perry and Strominger. I review recent results on soft hair in three spacetime dimensions. In particular, I focus on the near horizon symmetry algebra, which turns out to be surprisingly simple, namely infinite copies
of the Heisenberg algebra. The results are universal (in a sense that I shall make precise)
and could generalize to higher dimensions. Talk based on arXiv papers 1603.04824, 1607.00009, 1607.05360.
|
| Date: | Thu, 24.11.2016 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Raum 218, 2. Stock, 1090 Wien |
| Contact: | P.T. Chrusciel |
| Fusion of Interfaces in Landau-Ginzburg models |
| Speaker: | Stefan Fredenhagen (Univ. Wien) |
| Abstract: | Interfaces provide interesting structures in two-dimensional field theories. A particular operation is the fusion of two interfaces. In the example of N=2 Landau-Ginzburg models we can describe (B-type)-interfaces by matrix factorisations, and the fusion of such factorisations amounts to taking their tensor product. In the talk I will review these concepts and introduce an alternative functorial formulation of some interfaces which is tailored to give a simplified description of fusion. |
| Date: | Thu, 24.11.2016 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | Institute for Theoretical Physics, TU Wien, Seminar room, 10th floor, Wiedner Hauptstr. 8-10, 1040 Wien |
| Contact: | Johanna Knapp |
|