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Calendar of Physics Talks Vienna
| Palette of gravitoma(ch)genetic effects |
| Speaker: | Jiří Bičák (Institute of Theoretical Physics, Charles Univ., Prague) |
| Abstract: | Special Seminar: Special Seminar:I shall start with some remarks on Ernst Mach (+1916), who spent many years at the University in Prague and at the Vienna University. I briefly recall his and Einstein's ideas on the origin of inertia and their influence on the construction of general relativity. I mention the direct experiment verifying relativistic dragging/gravitomagnetic effects - the Gravity Probe B; the results were summarized only recently. I shall then turn to several specific general-relativistic problems illustrating the gravitomagnetic effects: the dragging of particles and fields around a rotating black holes, dragging inside a collapsing slowly rotating spherical shell of dust, linear dragging in a static situation, and the way how Mach's principle can be formulated in cosmology.A more detailed discussion will be devoted to the dragging effects by rotating gravitational waves |
| Date: | Tue, 17.05.2016 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock, 1090 Wien |
| Contact: | H. Rumpf |
| Dark Matter: From Stars to Detectors |
| Speaker: | Chris Kouvaris (CP3-Origins) |
| Abstract: | I will talk about constraints on dark matter based on observations of compact stars. I will additionally entertain the possibility of asymmetric dark matter forming stellar like objects, providing density profiles, mass-radii relations and “Chandrasekhar mass limits”. Finally I will present astrophysical effects that can affect the dark matter detection in direct search experiments and I will argue that the direct detection spectrum deviates from what is expected in low energy, making low energy threshold experiments a key player in identifying dark matter. |
| Date: | Wed, 18.05.2016 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | HEPHY, Nikolsdorfer Gasse 18, Bibliothek |
| Contact: | Josef Pradler |
| Scattering theory in dispersive wave equations with a background flow |
| Speaker: | Antonin Coutant (U Nottingham) |
| Abstract: | Im Rahmen des Literaturseminars: I will discuss several aspects of scattering theory in linear dispersive wave equations where the time derivative part is modified by a non-homogeneous background flow. The original motivation of this work is the analogy discovered by Unruh between sound propagating in a moving fluid and radiation around a black hole. In such setups, dispersive effect allow for new wave solutions with negative energy. I will describe how these solutions can be produced by linear conversion, their link with the Hawking effect, and several types of instabilities they give rise to. |
| Date: | Thu, 19.05.2016 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock, 1090 Wien |
| Contact: | H. Rumpf |
| The search for dark forces and particles at Belle and Belle II |
| Speaker: | Gianluca Inguglia (DESY) |
| Abstract: | Many extensions of the standard model postulate the existence of new forces and particles that might fill our gap of knowledge of the Universe and, with respect to its "dark" content, provide viable candidates for dark matter. These theories are often referred to as dark sector theories or simply as dark sector. In this seminar I will present and discuss possible decay topologies and dark sector "smoking gun" signatures in collider experiments, emphasizing not only the complementarity between different experimental set-ups (i.e. e+e- colliders vs. hadron machines), but also the interplay and possible synergies between different dark matter search strategies (direct vs. collider) and theory. After reviewing the current status of searches for dark forces and particles at the Belle Experiment, I will shortly introduce the main features and the status of the Belle 2 Experiment and discuss it |
| Date: | Fri, 20.05.2016 |
| Time: | 10:00 |
| Duration: | 60 min |
| Location: | HEPHY, Wohllebengasse 12-14 |
| Contact: | Christoph Schwanda |
| The smallest possible thermal machines and the foundations of thermodynamics |
| Speaker: | Sandu Popescu (University of Bristol ) |
| Abstract: | In my talk I raise the question of what are the fundamental limits on the size of thermal machines - refrigerators, heat pumps and work producing engines - and I will present the smallest possible ones. I will then discuss the issue of a possible complementarity between size and efficiency and I will show that even the smallest machines could be maximally efficient. I will the present new point of view over what is work and what thermal machines actually do. Finally I will present a new approach to the foundations of thermodynamics that follows from these results. |
| Date: | Fri, 20.05.2016 |
| Time: | 10:30 |
| Location: | Atominstitut, Hörsaal, Stadionallee 2, Wien 2 |
| Contact: | J. Schmiedmayer |
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