Calendar of Physics Talks Vienna

Phases of fuzzy field theories
Speaker:Juraj Tekel (Univ. Bratislava)
Abstract:im Rahmen des Seminars für Mathematische Physik: We will discuss history and recent developments in the study of the phase structure of noncommutative scalar fields. Apart from the usual disorder and uniform order phases, the theory exhibits a third phase, which survives the commutative limit. This is connected to the UV/IR mixing of the noncommutative theory. We will rewrite the fuzzy theory as a modified quartic matrix model, with extra multitrace terms in the action and perform saddle point analysis of the theory. Our goal will be to locate the triple point of the theory and to reconstruct the numerically obtained phase diagram. This goal will be successfully reached at the end of the talk.
Date: Tue, 24.03.2015
Time: 14:15
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:H. Steinacker

The Topology of the Universe from the Cosmic Microwave Background Temperature and Polarization
Speaker:Prof. Aneesh V. Manohar (University of California, San Diego)
Abstract:4. Vorlesung der Schrödinger-Gastprofessur: The talk discusses constraints on the global topology of the universe from CMB data, in particular constraints on torus topologies T^3, T^2 x R and S^1 x R^2. The theoretical predictions are compared with experimental CMB data.
Date: Tue, 24.03.2015
Time: 16:15
Duration: 60 min
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:A. Hoang, P.T. Chrusciel

K– four nucleon absorption process studies through the Λt channel
Speaker:Ivana Tucakovic (INFN-Frascati)
Abstract:The study of the low-energy negatively charged kaons interactions with the nuclear matter will be presented. In particular, the interactions of the kaons produced at the DAΦNE collider with the He nuclei present in the drift chamber gas and with the C nuclei contained in the drift chamber wall of the KLOE detector, generating the Λt final state are studied. This channel gave us the possibility to investigate the K- four nucleon absorption (4NA), a process which is barely studied by other experimental and theoretical works. Dedicated MC simulations of the 4NA of the K- in He and C are performed and the experimentally extracted invariant mass, momentum and angular distributions spectra were fitted, in order to obtain for the first time the absolute value of the BR and the σ (100 MeV/c) for the 4NA process leading to the Λt pair in the final state.
Date: Wed, 25.03.2015
Time: 17:00
Duration: 60 min
Location:Stefan-Meyer-Institut Hörsaal (2.08), Boltzmanng. 3, 1090, Wien
Contact:Ken Suzuki