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Calendar of Physics Talks Vienna
| Large Field Inflation and the Weak Gravity Conjecture |
| Speaker: | Arthur Hebecker (Uni Heidelberg) |
| Abstract: | I will describe the theoretical interest in large-field inflation and its
relation to potential future observations, e.g. through primordial gravity
waves. I will outline the possible fundamental obstructions to
realising such inflationary scenarios, both in string theory and in quantum
gravity in general. The focus will in particular be on the recent scientific
debate in the context of the Weak Gravity Conjecture and Gravitational
Instantons, which will both be explained in simple terms. |
| Date: | Mon, 06.06.2016 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Seminar room DB-gelb-10, 10th floor, TU Wien, Wiedner Hauptstr. 8-10, 1040 |
| Contact: | Anton Rebhan |
| Introduction to Collider Physics and Effective Theory Methods |
| Speaker: | Prof. Iain Stewart (Massachusetts Institute of Technology) |
| Abstract: | zur 2. Vorlesung im Rahmen der Schrödinger-Gastprofessur 2016
In these lectures I introduce the key conceptual ingredients needed to understand and make predictions for processes like Higgs production at the Large Hadron Collider. This includes
the concepts of factorization, running couplings, parton distributions, and jets.
I will also discuss how the tools of effective field theory can be used to simplify calculations
for colliders, by exploiting universal features of soft and collinear radiation.
|
| Date: | Mon, 06.06.2016 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | Stefan-Meyer-Institut, Boltzmanngasse 3, 2. Stock, Raum 2.08 |
| Contact: | A. Hoang, H. Neufeld, A. Rebhan |
| String states, loops and effective actions in noncommutative field theory and matrix models |
| Speaker: | Harold Steinacker (Univ. Wien) |
| Abstract: | Im Rahmen des Seminars für Mathematische Physik:
We discuss string states as a tool for loop computations in noncommutative field theory
and matrix models. Defined in terms of coherent states, they exhibit the stringy features
of noncommutative field theory.We obtain a closed form for the 1-loop effective action in position space capturing the long-range non-local UV/IR mixing for scalar fields.
The non-locality is tamed in the maximally supersymmetric IKKT or IIB model,
where it gives rise to supergravity. The linearized supergravity interactions are obtained
directly in position space at one loop using string states on generic noncommutative branes.
|
| Date: | Tue, 07.06.2016 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Kleiner Seminarraum der Theor. Physik, 5. Stock Boltzmanngasse 5 |
| Contact: | H. Steinacker |
| Single metal adatoms at the magnetite Fe3O4(001) surface |
| Speaker: | Roland Bliem (TU Wien, Insitut für Angewandte Physik, AG Oberflächenphysik) |
| Abstract: | Magnetite (Fe3O4) is a widely abundant material with fascinating physical properties,
which form the basis of its various applications, for example in biomedicine,
microelectronics, or catalysis. In heterogeneous catalysis, magnetite is employed as
catalyst material and as support for active particles down to the size of single atoms.
The Fe3O4(001) surface is a particularly promising support material for single-atom
catalysis, since it is known to stabilize single Au adatoms up to 700 K. The stabilizing
property is closely related to the nature of the (√2×√2)R45° surface reconstruction,
which is based on an ordered array of subsurface Fe vacancies and interstitials.
Initially the structural model and its quantitative confirmation using low-energy electron
diffraction, scanning tunneling microscopy (STM) and ab initio thermodynamics will be
presented. Using STM, x-ray photoelectron spect |
| Date: | Tue, 07.06.2016 |
| 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: | Univ.Prof. Dr. Ulrike Diebold |
| Introduction to Collider Physics and Effective Theory Methods |
| Speaker: | Prof. Iain Stewart (Massachusetts Institute of Technology) |
| Abstract: | zur 3. Vorlesung im Rahmen der Schrödinger-Gastprofessur 2016:
In these lectures I introduce the key conceptual ingredients needed to understand and make predictions for processes like Higgs production at the Large Hadron Collider. This includes
the concepts of factorization, running couplings, parton distributions, and jets.
I will also discuss how the tools of effective field theory can be used to simplify calculations
for colliders, by exploiting universal features of soft and collinear radiation.
|
| Date: | Tue, 07.06.2016 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, H. Neufeld, A. Rebhan |
| The top quark mass: now and future |
| Speaker: | Roman Kogler (DESY und Univ. Hamburg, Institut für Experimentalphysik) |
| Abstract: | With the absence of convincing evidence for new physics in direct searches at collider experiments, precision tests provide an alternative route to search for deviations from the standard model (SM). One of the most powerful tests of this kind is the global electroweak fit, which successfully predicted the mass of the top quark and the Higgs boson
before their discoveries. I will show the present status of the electroweak fit and highlight its dependence on some key parameters, with a special emphasis on the mass of the top quark (mtop). Its precise determination
is essential for testing the overall consistency of the SM, to constrain new physics models and to extrapolate the SM to high energies. While direct kinematic measurements of mtop from the Tevatron and LHC provide precise results used in the electroweak fit, these are plagued by theoretical uncertainties difficult to assess... |
| Date: | Wed, 08.06.2016 |
| Time: | 12:00 |
| Duration: | 90 min |
| Location: | Fakultät für Physik, Kleiner Seminarraum der Theor. Physik, 5. Stock Boltzmanngasse 5 |
| Contact: | A. Hoang |
| Impulsive Yang-Mills scattering |
| Speaker: | Herbert Balasin (TU Wien) |
| Abstract: | im Rahmen des Literaturseminars der Gravitationsphysik:
We discuss the behavior of (classical) and quantum matter in impulsive
pp-Yang-Mills fields employing nonlinear generalized functions.
|
| Date: | Thu, 09.06.2016 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock, 1090 Wien |
| Contact: | P.T. Chrusciel |
| Speaker: | Manuel Bärenz |
| Abstract: | About six years ago, there was a brief interest in half-twists, which
are in a sense square roots of ribbon structures. There is work by
Snyder and Tingley about "half-ribbon Hopf algebras", by Peter Selinger
about "self-duality structures" and by Jeff Egger on "involutive
monoidal categories". All this work seemed related - already because of
the beautiful and insightful graphical calculus - but the relation was
never made explicit. Furthermore, not many applications of half-twists
were found. In this talk, I'll bring all of the different approaches
together (by drawing a lot of nice pictures, amongst other things) and
show the resolution to a few open problems set by the founders of the field.
John Barrett and me have recently found an unexpected way to make use of
half-twists in mathematical physics: It's "real structures", (finite
dimensional) noncommutative geometry and fuzzy spac |
| Date: | Thu, 09.06.2016 |
| Time: | 16:15 |
| Location: | Mathematiksche Fakultät, Besprechungsraum 3. Stock |
| Contact: | Nils Carqueville |
|