Institut für Kernphysik, Remote Seminar
16:15 Uhr s.t., None
|Gia Dvali, Max Plank Institute of Physics, Munich|
Understanding the origin of hierarchies is one of the main driving forces of today's fundamental research. The well-known examples are provided by the hierarchy between the weak and Planck scales, the hierarchy between neutrino and electron masses and the hierarchy between the Planck scale and the vacuum energy of the present Universe. Sometimes these puzzles are classified as so-called ``naturalness problems". Historically, in the case of proton/pion mass hierarchy, such questions led to advances that changed modern particle physics. In this talk we review certain representative examples when the hierarchy can be taken as a serious indication for new physics. We also review cases when a seeming naturalness problem is nullified by consistency of the theory. We give an example of the celebrated naturalness puzzle of the cosmological term. This however turns out to be fictitious, since the consistency of the S-matrix formulation demands that the cosmological constant is excluded from the energy budget of our Universe.
|at Recording of the presentation|
Institut für Physik
14:30 Uhr s.t., None
|Admir Greljo, Bern U.|
Recent R(K) update from the LHCb experiment at CERN reinforced the tension of B-meson decays into muons. Shortly after, the Muon g-2 experiment at Fermilab strengthened the tension in the muon anomalous magnetic moment. Immense theoretical and experimental work is still needed to possibly establish the existence of new physics, nonetheless, we can already ask relevant questions. Can muon anomalies be coherently addressed in models beyond the SM, and if so, where else should we look for confirmation? I will discuss minimal extensions of the SM based on 2103.13991.
GRK 2516 Soft Matter Seminar
10:30 Uhr s.t., via Zoom
|Markus Mezger, University of Vienna, MPI-P|
X-ray and Neutron Scattering Techniques for Soft Matter
Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)
Institut für Physik
14:00 Uhr s.t., None
|Prof. Dr. Ignacio Cirac, Max-Planck-Institut für Quantenoptik, Garching|
Quantum many-body systems are very hard to simulate, as computational resources (time and memory) typically grow exponentially with system size. However, quantum computers or analog quantum simulators may perform that task in a much more efficient way. In this talk, I will first review some of the quantum algorithms that have been proposed for this task and then explain the advantages and disadvantages of analog quantum simulators. I will also describe theoretical proposals to solve different quantum simulation problems with cold atoms in optical lattices.