The Institute for Theoretical Physics offers the following seminars:
The origin of the fermion mass hierarchy is one of the most compelling and mysterious questions for physics beyond the Standard Model. The discovery of neutrino oscillations and the subsequent measurements of the neutrino mass-squared differences and the lepton mixing angles over the past decade or so has reinvigorated the quest to elucidate the underlying physics that resolves this so-called "flavor puzzle" of the Standard Model. In this talk, I will give an overview of the theoretical approaches to the flavor puzzle, with a focus on the ways in which the neutrino mass and mixing parameters have challenged and extended the basic paradigms for understanding the origin of fermion masses in the Standard Model.
ETH Science City HPV G 4 - Wed 17.12.2014 16:15
Silicon is evolving as a versatile photonic platform with multiple functionalities that can be seamlessly integrated. The tool box is rich starting from the ability to guide and amplify multiple wavelength sources at GHz bandwidths, to optomechanical MEMS and opto-fluidics devices. As an example of novel device capabilities, I will discuss the generation of strong optical forces in these ultra small light confining structures. We have recently shown that optical forces can enable controllable, static manipulation of photonic structures, an important step towards enabling recently proposed functionalities for optomechanical devices, such as self-aligning and optical corralling behaviour. These advances should enable future micro-optomechanical systems (MOMS) with novel and distinct functionalities.
ETH Science City HPV G 4 - Wed 10.12.2014 16:15
The discovery of the Higgs boson signaled the beginning of a new era of precision in Higgs physics. In the coming decade(s), the experiments of the Large Hadron Collider will perform a plethora of very accurate measurements of phenomena associated with the new particle. These measurements will help us to answer fundamental questions in particle physics. To what extend is the Higgs physics responsible for the mass of the known elementary particles? Is the Higgs boson a portal to dark matter? How sensitive are the Higgs boson interactions to the laws of physics at very high energies? This presentation, emphasises the role pf precision in the theoretical simulations for answering such questions. It gives a flavour of the fascinating physics and the advanced mathematical methods which have been developed for this purpose. It also gives a personal assessment for the future prospects and opportunities in precision Higgs physics.
ETH Science City HPV G 4 - Wed 3.12.2014 16:15
In this talk I will present a recent work together with Domenico Fiorenza on topological quantum field theories on manifolds with boundaries. Using infinity-category theory, we develop a formalism to relate extended TQFTs with boundary conditions to lower dimensional theories with anomalies, which in specific situations give rise to projective representations of the mapping class group of surfaces. This involves a higher categorical generalisation of the notion of a group character. Time permitting, I will also argue that in the fully extended case the converse holds, i.e. an anomalous theory contains the right amount of information to obtain a fully extended theory in higher dimensions equipped with boundary conditions.
ETH Zentrum HG G 43 - Thu 27.11.2014 15:15
Semiconductor microcavities provide a unique platform to explore the physics of non-linear quantum fluids of light. In this talk I will present our experiments on the propagation and manipulation of quantum fluids in photonic circuits. I will show how, using periodic or a-periodic lattices, we can simulate complex Hamiltonians. Perspectives in terms of quantum simulations will be discussed.
ETH Science City HPV G 4 - Wed 26.11.2014 16:15