Aktuelle Veranstaltung für 29 Nov 2022

Markus Fröb, U. Leipzig

Perturbative Quantum Gravity (pQG), the effective quantum field theory of gravitational fluctuations around a given background, is currently the only experimentally accessible theory of quantum gravity. Its tree-level predictions, in the form of temperature fluctuations of the Cosmic Microwave Background, have been experimentally confirmed, and it is possible that loop corrections are accessible to future experiments. However, while the tree-level results are well understood also from a theoretical point of view, the diffeomorphism symmetry of gravity makes the construction of invariant observables very difficult beyond this. Only recently, this issue has been overcome, and a class of causal invariant observables has been constructed. I will discuss this construction and how it can be related to observations, and present some predictions of pQG for graviton loop corrections to the Newtonian gravitational potential and the Hubble rate, the local expansion rate of the universe. Lastly, I show that pQG also predicts that spacetime becomes non-commutative at the Planck scale, but in a different way from previous approaches. The talk is based (in particular) on the recent papers arXiv:1806.11124, 2108.11960, 2109.09753 and 2207.03345.

at Zoom

Theorie-Palaver

14:00 Uhr s.t., Lorentz room (Staudingerweg 7, 5th floor)

Prof. Dr. Katrin Amann-Winkel, MPI für Polymerforschung Mainz

Water is ubiquitous and the most important liquid for life on earth. Although the water molecule is seemingly simple, various macroscopic properties of water are most anomalous, such as the density maximum at 4°C or the divergence of the heat capacity upon cooling. Computer-simulations suggest that the anomalous behaviour of ambient and supercooled water could be explained by a two state model of water. An important role in this ongoing debate plays the amorphous forms of water. Since the discovery of two distinct amorphous states of ice with different density (high- and low density amorphous ice, HDA and LDA) it has been discussed whether and how this phenomenon of polyamorphism at high pressures is connected to the occurrence of two distinct liquid phases (HDL and LDL). X-ray free electron laser allow us to investigate metastable states of supercooled water within nano- to microseconds. In my talk I will give an overview on our recent X-ray experiments on supercooled water and amorphous ices.

Physikalisches Kolloquium

16:15 Uhr s.t., HS KPH


Wochenübersicht für die Woche 28 Nov 2022 bis 04 Dec 2022 (KW 48)

28 Nov 2022

RIND seminar on Mathematical Physics and String Theory

U. Mainz, LMU Munich, U. Heidelberg, U. Vienna

16 Uhr c.t.

Enno Keßler, MPI-M Bonn
J-holomorphic curves or pseudoholomorphic curves are maps from Riemann surfaces to symplectic manifolds satisfying the Cauchy-Riemann equations. J-holomorphic curves are of great interest because they allow to construct invariants of symplectic manifolds and those invariants are deeply related to topological superstring theory. A crucial step towards Gromov–Witten invariants is the compactification of the moduli space of J-holomorphic curves via stable maps which was first proposed by Kontsevich and Manin. In this talk, I want to report on a supergeometric generalization of J- holomorphic curves and stable maps where the domain is a super Riemann surface. Super Riemann surfaces have first appeared as generalizations of Riemann surfaces with anti-commutative variables in superstring theory. Super J-holomorphic curves couple the equations of classical J-holomorphic curves with a Dirac equation for spinors and are critical points of the superconformal action. The compactification of the moduli space of super J- holomorphic curves via super stable maps might, in the future, lead to a supergeometric generalization of Gromov-Witten invariants. Based on arXiv:2010.15634 [math.DG] and arXiv:1911.05607 [math.DG], joint with Artan Sheshmani and Shing-Tung Yau.
at Zoom

zukünftige Termine
30 Nov 2022

PRISMA+ Colloquium

Institut für Physik

13:00 Uhr s.t., Lorentz-Raum, 05-127, Staudingerweg 7

Prof. Dr. Tetyana Galatyuk, GSI Darmstadt
What happens when gold nuclei, accelerated to about 90% of the speed of light, strike gold nuclei at rest? For an extremely short time, t~10^-23 seconds, states of matter at extreme temperatures (10^12 K) and densities (>280 Mt/cm^3) are produced. The microscopic properties of the strong-interaction matter under extreme conditions of temperature and density is a topic of great current interest. Despite 18 orders of magnitude difference in system size and time, the conditions present in heavy-ion collisions share great overlap with the conditions of the strong-interaction matter in neutron-star mergers. The possibility to form and explore in the laboratory strong-interaction matter under extreme conditions is truly fascinating. The Compressed Baryonic Matter (CBM) experiment at FAIR has the potential to discover the most prominent landmarks of the QCD phase diagram expected to exist at high net baryon densities. The measurement of comprehensive set of diagnostic probes offers the possibility to find signatures of exotic phases, and to discover the conjectured first order deconfinement phase transition and its critical endpoint. In this talk the referent will focus on relevant observables to study criticality, emissivity, vorticity and equation-of-state of baryon rich matter. Particular emphasis is put on rare probes which are not accessible by other experiments in this energy range.

SPICE-Spin+X Seminar

TUK and JGU

15:00 Uhr s.t., Zoom

Alice Mizrahi, CNRS-Thales
Multilayer spintronic neural networks with radio-frequency connections
at Zoom and SPICE YouTube Channel

Seminar über die Physik der kondensierten Materie (SFB/TRR173 Spin+X und SFB/TR288 Kolloquium, TopDyn-Seminar)

JGU

10:00 Uhr s.t., TUK, Building 76, Room 276 (LASE)

Prof. Victor L’vov, Dept. of Chemical and Biological Physics, Weizmann Institute of Science
Hydrodynamic turbulence in superfluid Helium: basic ideas, experiments, and physical models
at Zoom

01 Dec 2022

Seminar über die Physik der kondensierten Materie (SFB/TRR173 Spin+X und SFB/TR288 Kolloquium, TopDyn-Seminar)

JGU

16:15 Uhr s.t., 01-122 Newton Raum

Martin Beye, DESY
Resonant inleastic X-ray scattering (RIXS) especially in the soft X-ray region has seen a tremendous increase in applicability and scientific insight over the recent years. This was largely enabled by progress in instrumentation and theoretical description. Now the time is ripe to apply RIXS to pressing problems and develop the technique further making full use of the capabilities of novel X-ray sources. In my talk, I will address three main themes from my research: 1. Time-resolved RIXS at free-electron lasers applied to relevant dynamic processes in chemistry (on surfaces, in liquids and in solid catalysts) 2. RIXS with micrometer spatial resolution to resolve domain dynamics in complex materials and on devices in-operando 3. Non-linear spectroscopies in the soft X-ray range to enhance information content and signal levels I will show and discuss experimental results from all research themes and point to future development directions.

Seminar über Theorie der kondensierten Materie / TRR146 Seminar

K. Binder/ A. Nikoubashman / F. Schmid / G. Settanni / T. Speck / M. Sulpizi / P. Virnau

15:00 Uhr s.t., Remote

Oliver Beckstein, Arizona State University
TBA

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. Tobias Hurth
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