Seminars, Colloquia & Meetings

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Please note: The entries in this list appear currently in reverse chronological order.

May 22, 2017

D-PHYS (members only) - Ausschuss


- ETH Zürich, Hönggerberg HIT E 41.1 - Mon 22.05.2017 13:00-18:00

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May 17, 2017

Colin A. Norman (Dept. of Physics & Astronomy, John Hopkins University, Baltimore, USA) - The Formation, Evolution and Environments of Active Galaxies

Active galaxies host billion solar masses central black holes, whose impact on galaxies and structure on super-galactic scales is still unknown. I will discuss formation and evolution of low- and high-redshift active galaxies with emphasis on environments where feedback effects become important. In the light of new simulations and data, I will also examine the relation between starbursts and activity in galaxies and the underlying physics of multi-phase media in these extreme conditions.
- ETH Zürich, Hönggerberg HPV G 4 - Wed 17.05.2017 16:15

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May 16, 2017

D-PHYS (members only) - Unterrichtskommission


- ETH Zürich, Zentrum - Tue 16.05.2017 15:15

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May 16, 2017

D-PHYS (members only) - Betriebskommission der Betriebe D-PHYS


- ETH Zürich, Hönggerberg HPF G 6 - Tue 16.05.2017 9:00-11:00

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May 10, 2017

Federico Capasso (School of Eng. & Applied Sciences, Harvard University, Cambridge, USA) - Metaoptics

Metasurfaces based on sub-wavelength patterning have major potential for arbitrary control of the wavefront of light by achieving local control of the phase, amplitude and polarization and allowing greater functionality and more compact devices. High performance metalenses for the visible, achromatic lenses, axicons, vortex plates, holograms, ultracompact spectrometers and polarimeters will be discussed along with the potential of this technology for a wide range of applications.
- ETH Zürich, Hönggerberg HPV G 4 - Wed 10.05.2017 16:15

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May 3, 2017

Department of Physics, University of Konstanz, Konstanz, Germany (CERN, Geneva & Université catholique de Louvain, Louvain, Belgium) - From Pure Mathematics to Precision Physics: Modern Approaches to Scattering Amplitudes

The computation of quantum corrections to scattering processes has for a long time been hampered by the complexity of the integrals involved. In recent years there was tremendous progress in this area, partly due to the discovery of deep connections between scattering amplitudes and certain branches of pure mathematics. I will review these connections and discuss how they can be turned into new powerful tools for precision computations.
- ETH Zürich, Hönggerberg HPV G 4 - Wed 3.05.2017 16:15

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May 1, 2017

D-PHYS - Tag der Arbeit / Labour Day


- ETH Zürich, Hönggerberg - Mon 1.05.2017 8:00-18:00

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Apr 26, 2017

Sebastiano Cantalupo (ETH Zurich) - Illuminating the Dark Universe with the help of supermassive black holes


- ETH Zürich, Zentrum HG F 30 - Wed 26.04.2017 17:15

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Apr 24, 2017

D-PHYS - Sechseläuten / "Sechseläuten" (Zurich spring festival)


- ETH Zürich, Hönggerberg - Mon 24.04.2017 12:00-18:00

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Apr 21, 2017

D-PHYS - Promotionsfeier / Doctorate awards ceremony


- ETH Zürich, Hönggerberg HPH G 1 - Fri 21.04.2017 17:00

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Apr 17, 2017

D-PHYS - Ostermontag / Easter Monday


- ETH Zürich, Hönggerberg - Mon 17.04.2017 8:00-18:00

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Apr 14, 2017

D-PHYS - Karfreitag / Good Friday


- ETH Zürich, Hönggerberg - Fri 14.04.2017 8:00-18:00

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Apr 12, 2017

Tom Abel (Kavli Inst. Particle Astrophys. & Cosmology, Stanford University, USA) - Making Sense of the Universe with Supercomputers

In computational cosmology we face complex multi-scale and multi-physics problems. Algorithmic advances have enabled ever more realistic numerical models of a wide range of astrophysical objects. We describe and show results from adaptive mesh refinement simulations capturing 15 orders of magnitude in length scale, adaptive ray tracing for radiation hydro-dynamics, and a new noise-free approach to solve the collision-less Boltzmann equation.
- ETH Zürich, Hönggerberg HPV G 4 - Wed 12.04.2017 16:15

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Apr 7, 2017

D-PHYS (members only) (D PHYS, ETH Zürich) - aoPK SNF Professorship


- ETH Zürich, Hönggerberg HIT E 41.1 - Fri 7.04.2017 13:00-19:00

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Apr 5, 2017

Elke Scheer (Department of Physics, University of Konstanz, Germany) - Atomic Scale Functional Devices

Fabricating electronic devices with functional units of atomic size is a major driving force of nanotechnology. Key elements in microelectronics include switches and small magnets that both can be operated as memory devices. Here I will show that an atomic-size contact can be operated as reliable two-terminal switch. I will then address the emergence of magnetism at the atomic scale and how it can be revealed by magnetotransport measurements.
- ETH Zürich, Hönggerberg HPV G 4 - Wed 5.04.2017 16:15

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Mar 29, 2017

Piet O. Schmidt (QUEST Inst., PTB, Braunschweig & Leibniz University, Hannover, Germany) - Quantum Logic Spectroscopy of Trapped Ions

Precision spectroscopy is a driving force for the development of our physical understanding and novel applications in quantum sensing and optical clocks. However, only few atomic and molecular systems of interest have been accessible to precision spectroscopy in the past. This restriction can be overcome in quantum logic spectroscopy by combining the features of two ion species using techniques from quantum computing.
- ETH Zürich, Hönggerberg HPV G 4 - Wed 29.03.2017 16:15

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Mar 28, 2017

Jürg Fröhlich (ETH Zürich) - The Statistical Mechanics of the Universe


- ETH Zürich, Hönggerberg HIT H 42 - Tue 28.03.2017 16:15

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Mar 28, 2017

Simon Badger (ETH Zürich) - Local integrands for two-loop amplitudes


- ETH Zürich, Hönggerberg HIT E 41.1 - Tue 28.03.2017 11:15

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Mar 27, 2017

Franz Muheim (University of Edinburgh, Scotland) - The beauty quark at 40

In 1977 the beauty or b quark was discovered at Fermilab. Since then this new particle has continued to surprise us. I will shortly review a few of the major results obtained from measurements involving b-quarks. Furthermore, I will report on results from the LHCb experiment which is collecting huge samples of decays from decays of particles containing b-quarks, including CP violation, rare decays and exotic spectroscopy. I'll then present a forward look for physics with b-quarks, including the potential of the upgrades of the LHCb experiments.
- UZH Irchel Y16 G 05 - Mon 27.03.2017 12:00

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Mar 22, 2017

Andreas Heinrich (Center Quantum Nanoscience&Ewha Womans University, Seoul, South Korea) - Electron Spin Resonance of Single Atoms on a Surface

The scanning tunneling microscope (STM) is an amazing tool because of its atomic-scale spatial resolution. This can be combined with the use of low temperatures, culminating in precise atom manipulation and spectroscopy with microvolt energy resolution. In this talk I will apply these techniques to the investigation of the quantum spin properties of transition metal atoms on surfaces. We will conclude with our recent measurements of electron spin resonance in an STM, offering unprecedented energy resolution on the atomic scale.
- ETH Zürich, Hönggerberg HPV G 4 - Wed 22.03.2017 16:15

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Mar 16, 2017

R. Pohl (Max-Planck-Institut für Quantenoptik, München, Deutschland) - Shrinking the Proton - Laser Spectroscopy for Nuclear Physics and fundamental Constants

For more than a decade, the rms charge radius of the proton was "known" to be 0.88fm, with about 1% uncertainty [1]. Two methods, elastic electron scattering and precision laser spectroscopy of atomic hydrogen, yielded consistent values. In 2010, our result from laser spectroscopy of the exotic "muonic hydrogen" atom at PSI yielded a 4% smaller value, 0.84 fm, with an uncertainty of less than 0.1% [2,3]. In muonic hydrogen, a negative muon orbits a proton with a 200 times smaller Bohr orbit than in regular hydrogen, which increases the sensitivity of muonic hydrogen to the proton charge radius by 200^3 ~ 10 million! Since 2010, the discrepancy increased to more than 7 sigmas [4], making it one of the biggest discrepancies in the Standard Model. I will discuss the so-called "proton radius puzzle" [5], report on more measurements in muonic atoms [6], and the result of a new measurement in regular atomic hydrogen.
- PSI Area West WHGA 001 - Thu 16.03.2017 16:00

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Mar 15, 2017

Jonathan Simon (Department of Physics, University of Chicago, USA) - Building Quantum Materials from Light

I will present recent work realizing topological phases of light generated using a non-planar optical resonator to induce a Lorentz force on photons. In particular, I will describe our exploration of Landau levels on a cone and validation of the Wen-Zee theory of topological physics in curved space. Finally, I will discuss ongoing work to mediate interactions between photons using Rydberg atoms, plus techniques weare developing to assemble photonic few-body states both photon-by-photon and through engineered dissipation.
- ETH Zürich, Hönggerberg HPV G 4 - Wed 15.03.2017 16:15

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Mar 15, 2017

Laura Hendriks (ETH Zürich) - Radiocarbon bomb peak dating of paintings


- ETH Zürich, Hönggerberg HPK D 24 - Wed 15.03.2017 11:00

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Mar 13, 2017

Leonardo Senatore (Department of Physics, Stanford University, USA) - On Effective Field Theory (and a bit of Differential Geometry) in Cosmology

I will present two applications of the Effective Field Theory framework to Cosmology. The first regards Inflation, where we provide the most general parametrization of the fluctuations during this early phase of the universe. The second is about the cosmological large-scale structure, where, notwithstanding the presence of short distance non-linearities, we are able to develop a rigorous perturbative description that is valid at long distances.
- ETH Zürich, Hönggerberg HIT H 42 - Mon 13.03.2017 16:45

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Mar 9, 2017

J. Hangst (University Aarhus, Denmark) - 1S-2S transition in anti-H


- PSI Area West WHGA 001 - Thu 9.03.2017 16:00

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Mar 9, 2017

Ping Xu (State University, Pensylvania, USA) - Formality theorem and Kontsevich-Duflo theorem for Lie pairs

A Lie pair (L,A) consists of a Lie algebra (or more generally, a Lie algebroid) L together with a Lie subalgebra (or Lie subalgebroid) A. A wide range of geometric situations can be described in terms of Lie pairs including complex manifolds, foliations, and manifolds equipped with Lie group actions. To each Lie pair (L,A) are associated two L-infinity algebras, which play roles similar to the spaces of polyvector fields and polydifferential operators. We establish the formality theorem for Lie pairs. As an application, we obtain Kontsevich-Duflo type theorem for Lie pairs. Besides using Kontsevich formality theorem, our approach is based on the construction of a dg manifold (L[1] + L/A, Q) together with a dg foliation, called the Fedosov dg Lie algebroid. This is a joint work with Hsuan-Yi Liao and Mathieu Stienon.
- ETH Zürich, Zentrum HG G 19.1 - Thu 9.03.2017 14:15

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Mar 8, 2017

Olivier Darrigol (University Paris Diderot - CNRS SPHERE, France) - Necessity and Contingency of Physical Theories

Can we derive physical theories by pure reasoning, without appeal to experiments? Although most physicists since Newton would say No, there were a few interesting attempts, since Descartes, to prove the rational necessity of the laws of (physical) geometry, mechanics, relativity theory, and quantum mechanics. I will briefly review these attempts and argue that a few of them, based on broad criteria for the comprehensibility of nature, express a moderate, respectable, and instructive form of rationalism.
- ETH Zürich, Hönggerberg HPV G 4 - Wed 8.03.2017 16:15

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Mar 8, 2017

Pietro Longhi (Uppsala University, Sweden) - Wall crossing invariants from spectral networks

In presence of defects the Hilbert space of a quantum field theory can change in interesting ways. Surface defects in 4d N=2 theories introduce a class of 2d-4d BPS states, which the original 4d theory does not possess. For theories of class S, spectral networks count 2d-4d BPS states, and through the 2d-4d wall-crossing phenomenon the 4d BPS spectrum can be obtained. Adopting this physical viewpoint on spectral networks, I will illustrate some recent and ongoing developments based on this framework, with applications to the study of 4d N=2 BPS monodromies and their relations to specialisations of the superconformal index.
- ETH Zürich, Hönggerberg HIT E 41.1 - Wed 8.03.2017 11:30

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Mar 8, 2017

Naki Akcar (Universität Bern) - East African Glaciations: First impressions


- ETH Zürich, Hönggerberg HPK D 24 - Wed 8.03.2017 11:00

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Mar 7, 2017

Keri Vos (ETH Zürich) - CP violation in non-leptonic two and three-body B decays


- ETH Zürich, Hönggerberg HIT E 41.1 - Tue 7.03.2017 11:15

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Mar 6, 2017

- Biomedical Engineering


- ETH Zürich, Zentrum ETZ E 6 - Mon 6.03.2017 12:15-13:00

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Mar 6, 2017

Mauro Pieroni (Laboratoire AstroParticule et Cosmologie, Paris, France) - Universality classes for inflation and primordial GW from pseudoscalar inflation.

My seminar is divided in two parts: In the first part of my seminar I propose a classification of inflationary models by using the most basic property of inflation: the approximate scaling invariance. This framework relies on the possibility of describing inflation in terms of a renormalization group equation. The slow rolling regime in this context is interpreted as the slow evolution close to a fixed point. In this framework we can thus explain in part the universality observed in the predictions of a certain number of inflationary models. In the second part of my seminar I discuss the possibility of generating an observable gravitational wave (GW) background by coupling a pseudoscalar inflaton to some abelian gauge fields. The analysis is performed by dividing inflationary models into universality classes. One of the most promising scenarios is Starobinsky-like inflation, which may lead to observable signatures both in direct GW detectors as well as in upcoming CMB detectors. The complementarity between CMB and direct GW detection may be used to extract informations on the microphysics of inflation.
- UZH Irchel Y16 G 05 - Mon 6.03.2017 12:00

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Mar 3, 2017

D-PHYS (members only) - Departements- und Professorenkonferenz


- ETH Zürich, Hönggerberg HPH G 1 - Fri 3.03.2017 14:00-18:00

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Mar 3, 2017

D-PHYS (members only) - PK-Lunch


- ETH Zürich, Hönggerberg HIT E 51 - Fri 3.03.2017 12:00-13:30

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Mar 2, 2017

(ETH Zürich) - AMP General Assembly 2017


- ETH Zürich, Hönggerberg HPF G 6 - Thu 2.03.2017 18:15-19:30

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Mar 2, 2017

John Tranquada (Brookaven Natl Lab, USA) - What stripes tell us about superconductivity in the cuprates


- ETH Zürich, Hönggerberg HPF G 6 - Thu 2.03.2017 16:45-18:00

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Mar 2, 2017

E. Salumbides (Vrije University, Amsterdam, Netherlands) - Exploring exotic physics with simple molecules


- PSI Area Ost OSGA EG 06 - Thu 2.03.2017 16:00

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Mar 2, 2017

Alexander Veselov (Loughborough University, England) - Lyapunov spectrum for Markov dynamics and hyperbolic structures

We study the Lyapunov exponents Λ(x) for Markov dynamics as a function of path determined by x ∈ RP1 on a binary planar tree, describing the growth of Markov triples and their ``tropical" version - Euclid triples. We show that the corresponding Lyapunov spectrum is [0, ln φ], where φ is the golden ratio, and prove that on the set X of the most irrational numbers the corresponding function ΛX is convex and strictly monotonic. The key step is using the relation of Markov numbers with hyperbolic structures on punctured torus, going back to D. Gorshkov and H. Cohn, and, more precisely, the recent result by V. Fock, who combined this with Thurston’s lamination ideas. The talk is based on joint work with K. Spalding.
- ETH Zürich, Zentrum HG G 43 - Thu 2.03.2017 15:15

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Mar 2, 2017

Paolo de Natale (Istituto Nazionale di Ottica (INO), LENS, Florence, Italy) - Frontiers of trace gas sensing

Progress in coherent sources and spectroscopic techniques in the infrared/THz range at INO group will be reviewed. These frequencies correspond to the vibrational and rotational degrees of freedom in molecules. Furthermore, the main applications and the new physics that is going to be unveiled at lab scale and at eV energy scales will be discussed.
- ETH Zürich, Hönggerberg HPF G 6 - Thu 2.03.2017 14:00

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Mar 1, 2017

Annica Black-Schaffer (Dept. of Physics and Astronomy, Uppsala University, Sweden) - Topological Superconductors and Majorana Fermions

Topological superconductors with Majorana fermion quasiparticles form a newly discovered class of matter. The Majorana fermion can be seen as half an electron, or more accurately, the electron wave function has split up into two separate parts. I will explain why Majorana fermions appear, briefly review the current experimental status, and report on a few of our new findings, such as spontaneous currents and disorder robustness.
- ETH Zürich, Hönggerberg HPV G 4 - Wed 1.03.2017 16:15

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Mar 1, 2017

Giovanni Monegato (National Research Council, Rome, Italy) - An updated overview of Last Glacial Maximum on the Southern side of the Alps: comparisons and climate considerations


- ETH Zürich, Hönggerberg HPK D 24 - Wed 1.03.2017 11:00

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Feb 28, 2017

Scott Trager (University of Groningen, Netherlands) - Inferring the IMF in massive galaxies from stellar population modeling

In this talk I will review the recent results on the IMF variations inside Galaxies, and offer a perspective on how to interpret these results.
- ETH Zürich, Hönggerberg HIT H 42 - Tue 28.02.2017 16:15

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Feb 28, 2017

D-PHYS (members only) - Gemeinsame Unterrichtskommission


- ETH Zürich, Hönggerberg HPZ E 35 - Tue 28.02.2017 15:15

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Feb 28, 2017

Jure Zupan (ETH Zürich) - Chiral Effective Theory of Dark Matter Direct Detection


- ETH Zürich, Hönggerberg HIT E 41.1 - Tue 28.02.2017 11:15

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Feb 27, 2017

Guido Burkard (ETH Zürich) - Electron Spins Interacting with Electric Fields


- ETH Zürich, Hönggerberg HIT H 42 - Mon 27.02.2017 16:45

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Feb 27, 2017

D-PHYS (members only) - Ausschuss


- ETH Zürich, Hönggerberg HIT E 41.1 - Mon 27.02.2017 13:00-18:00

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Feb 27, 2017

Michael Paul (Racah Institute of Physics, Hebrew University, Jerusalem, Israel) - Nuclear astrophysics and radiotherapy prospects with a liquid-lithium accelerator-based neutron source

Neutron physics plays a central role in science and technology and the advent of high- intensity accelerators open possible avenues for neutron production modes alternative to nuclear reactors. We describe experiments performed with the milliAmpere- proton beam (2- 4 kW) from the Soreq Applied Research Accelerator Facility (SARAF) and the Liquid- Lithium Target (LiLiT), yielding high- intensity 30- keV quasi -Maxwellian neutrons (3- 5×10 10 n/s). The setup is applied to the study of astrophysical neutron- induced reactions w hich remain at the forefront of experimental investigations of stellar nucleosynthesis and chemical evolution of the Galaxy. α, β, γ spectrometry and atom -counting techniques (accelerator mass spectrometry, magneto- optical trap trace analysis) are used to detect activation products. We pursue in parallel the development of a prototype neutron source for Boron Neutron Capture Therapy (BNCT), based on a high- intensity proton accelerator and a liquid- lithium target.
- PSI Area Ost OSGA EG 06 - Mon 27.02.2017 11:00

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25.02.2017
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