Aktuelle Veranstaltung für 24 Nov 2020

Bert Koopmans, Eindhoven University of Technology, The Netherlands

Femto-magnetism meets spintronics: Towards integrated magneto-photonics

at Recording of the presentation

Physikalisches Kolloquium

16:15 Uhr s.t.

Davide Racco, Perimeter Institute

The low frequency part of the gravitational wave spectrum generated by local physics, such as a phase transition, is largely fixed by causality, offering a clean window into the early Universe. Due to the difference between sub-horizon and super-horizon physics, it is inevitable that there will be a distinct spectral feature that could allow for the direct measurement of the conformal Hubble rate at which the phase transition occurred. As an example, free-streaming particles present during the phase transition affect the production of super-horizon modes. This leads to a steeper decrease in the spectrum at low frequencies as compared to the well-known causal \(k^3\) super-horizon scaling of stochastic gravity waves. If a sizeable fraction of the energy density is in free-streaming particles, they even lead to the appearance of oscillatory features in the spectrum. If the universe was not radiation dominated when the waves were generated, a similar feature also occurs at the transition between sub-horizon to super-horizon causality. These features can be used to show surprising consequences, such as the fact that a period of matter domination following the production of gravity waves actually increases their power spectrum at low frequencies.

at Zoom


14:30 Uhr s.t., MITP seminar room

Wochenübersicht für die Woche 23 Nov 2020 bis 29 Nov 2020 (KW 48)

23 Nov 2020

Seminar about Experimental Particle and Astroparticle Physics (ETAP)

Institut für Physik

12:30 Uhr s.t., usually Staudingerweg 7, Minkowskiraum

Viacheslav Filimonov, Institut für Physik
Global Demonstrator and PFM module
at Zoom for now

zukünftige Termine
25 Nov 2020

PRISMA Colloquium

Institut für Physik

13:00 Uhr s.t.

Matteo Alfonsi, Institut für Physik, ETAP
The XENON1T experiment has recently reported new results from the analysis of low energy electronic recoils data, characterized by the lowest background rate ever achieved in the energy range between 1 and 30 keV. An excess over known background has been observed around 2-3 keV, and this observation has been interpreted in terms of the existence of solar axions, or as an enhancement of the neutrino magnetic moment observed in solar neutrinos, or as an additional background initially not considered. In the latter hypothesis, among the various possibilities considered such as traces of 127Xe or 37Ar or tritium diluted into the active volume, only the tritium hypothesis cannot be confirmed or excluded with the current knowledge of the production and reduction mechanism. In this seminar I will describe the detector operation, the analysis approach and the arguments that allowed us to arrive to such conclusions, trying to address also the additional questions that has been posed by the community.
at Zoom

26 Nov 2020

Seminar über Quanten-, Atom- und Neutronenphysik (QUANTUM)

Institut für Physik

14 Uhr c.t.

Dr. James Millen, King's College London, UK
Nanoparticles suspended and cooled in vacuum are seen as ideal candidates for testing the limits of quantum mechanics, beyond state-of-the-art sensing, and tabletop detection of gravitational waves and dark matter. The standard technology involves optical trapping and levitation, though this comes with issues of optical absorption and photon scattering. Away from the optical regime, electromechanics concerns the control of mechanical motion via its coupling to an electrical circuit. Chip-based electromechanical systems are leading quantum technologies, allowing entanglement between different circuit-signals, quantum squeezing, and the coherent conversion of signals between different frequency regimes. I will present our preliminary results in the field of Levitated Electromechanics, where particles are levitated, detected and controlled all-electrically. I will introduce the concept of bath engineering in this system with a preliminary study of non-equilibrium dynamics, and our work towards miniaturization. For more information see www.levi-nano.com
at Zoom

27 Nov 2020

GRK 2516 Soft Matter Seminar

Uni Mainz

10:30 Uhr s.t., via Zoom

Thomas Hermans, University of Strasbourg, CNRS

Zum Physikalischen Kolloquium Mainz

Liste der laufenden Seminare und Kolloquien

Veranstaltungstitel Termin und Ort Koordinator
Institutsseminar Kern- und Hadronenphysik Montags, 1415 Uhr, HS Kernphysik, Becherweg 45 Prof. Dr. Michael Ostrick
Seminar Festkörper- und Grenzflächenphysik Dienstags, 1200 Uhr, Newton-Raum, Staudingerweg 9, 1. Stock, Raum 122 (Nebengebaeude) Prof. Dr. Hans-Joachim Elmers
Seminar über Theorie der Kondensierten Materie/
Weiche Materie und Statistische Physik
Freitags, 1030 Uhr, Newton-Raum (LG 01-122) Dr. Giovanni Settanni
Theory of Condensed Matter: Hard Condensed Matter Tuesday, 1000 Uhr, Seminarraum K Prof. Dr. Jairo Sinova
Theorie Palaver Dienstags, 1430 Uhr, Lorentz-Raum (05-127) Lisa Zeune
Physikalisches Kolloquium Mainz Dienstags, 1615 Uhr, HS Kernphysik, Becherweg 45 Prof. Dr. Uwe Oberlack, Prof. Dr. Achim Denig
PRISMA Colloquium Mittwochs, 1300 Uhr, Lorentz-Raum (05-127) Prof. Dr. Stefan Tapprogge
Prof. Dr. Sonia Bacca
Prof. Dr. Randolf Pohl
Quantengravitation-Seminar Donnerstags, Sozialraum der THEP; Institut fuer Physik (05-427). Prof. Dr. M. Reuter
Theoriekolloquium Donnerstags, 1600 Uhr, Newton-Raum (LG 01-122). Prof. Dr. P.G.J. van Dongen
QUANTUM-Seminar Donnerstags, 1415, Lorentz-Raum (05-127) Dr. Arne Wickenbrock,
Dr. Mustapha Laatiaoui.
Seminar experimentelle Physik der kondensierten Materie Donnerstags, 1400, Minkowski-Raum, 05-119, Staudingerweg 7 Prof. Dr. M. Kläui
Seminar zu Themen in der Collider-Physik Freitags, 1230, Sozialraum ThEP (05-427) Prof. Dr. M. Neubert
MAINZ lecture series Mittwochs, 915, Staudingerweg 9, 3. Stock, Raum 122 Dr. M. Weides
Excellence@WORK XXXXX,XXXX Katrin Klauer
Seminar about Experimental Particle and Astroparticle Physics (ETAP) Montags, 1215, Staudingerweg 7, 5. Stock, Minkowski-Raum 119 Dr. DB. Ta

Weitere Veranstaltungen

Quantum Sonderseminar Seminarraum Quantum (02-427) Prof. Dr. Ferdinand Schmidt-Kaler

Beteiligte Einrichtungen: Institut für Physik,
Institut für Kernphysik,
Institut für Physik der Atmosphäre
Max-Planck-Institut für Polymerforschung, Max-Planck-Institut für Chemie
Technische Wartung: ducbao.ta (klammeraffe) uni-mainz.de