Wochenübersicht für die Woche vom

19 Apr 2021 bis 25 Apr 2021 (KW 16)

KW14 - KW15 - KW16 - KW17

keine vergangenen Seminare

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19 Apr 2021

Seminar about Experimental Particle and Astroparticle Physics (ETAP)

Institut für Physik

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

Vincent Roy, Universität Mainz
The Story of the Mainz Neutrino Mass Experiment
at Zoom for now

SFB/TR49/SFB TRR 173 Spin+X-Kolloquium/TopDyn - Seminar experimentelle Physik der kondensierten Materie

SFB/TR49 - Prof. Dr. Elmers

16:00 Uhr s.t., None

Andrii Chumak, University of Vienna, Austria
Nano-Magnonics: From Room to Cryogenic Temperatures
at Zoom

20 Apr 2021


Institut für Physik

14:30 Uhr s.t., MITP seminar room

Xiaofeng Xu, Bern University
Canonical Feynman integrals are of great interest in the study of scattering amplitudes at the multi-loop level. We propose to construct d log-form integrals of the hypergeometric type, treat them as a representation of Feynman integrals, and project them into master integrals using intersection theory. This provides a constructive way to build canonical master integrals whose differential equations can be solved easily. We use our method to investigate both the maximally cut integrals and the uncut ones at one and two loops, and demonstrate its applicability in problems with multiple scales.
at Zoom

Physikalisches Kolloquium

Institut für Kernphysik, Remote Seminar

16:15 Uhr s.t., None

Mehran Kardar, Massachusetts Institute of Technology, Cambridge, USA
Affinity maturation (AM) is the process through which the immune system evolves antibodies (Abs) which efficiently bind to antigens (Ags), e.g. to spikes on the surface of a virus. This process involves competition between B-cells: those that ingest more Ags receive signals (from T helper cells) to replicate and mutate for another round of competition. Modeling this process, we find that the affinity of the resulting Abs is a non-monotonic function of the target (e.g. viral spike) density, with the strongest binding at an intermediate density (set by the two-arm structure of the antibody). We argue that, to evade the immune system, most viruses evolve high spike densities (SDs). An exception is HIV whose SD is two orders of magnitude lower than other viruses. However, HIV also interferes with AM by depleting T helper cells, a key component of Ab evolution. We find that T helper cell depletion results in high affinity antibodies when SD is high, but not if SD is low. This special feature of HIV infection may have led to the evolution of a low SD to avoid potent immune responses early on in infection. Our modeling also provides guides for design of vaccination strategies against rapidly mutating viruses.
at Zoom

21 Apr 2021

GRK 2516 Soft Matter Seminar

Uni Mainz

10:30 Uhr s.t., via Zoom

Angelika Kühnle, Bielefeld University

SPICE-Spin+X Seminar


15:00 Uhr s.t., None

Chiara Ciccarelli, University of Cambridge
at Zoom and SPICE YouTube Channel

22 Apr 2021

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

Institut für Physik

14:00 Uhr s.t., None

Prof. Dr. Konrad Lehnert, JILA, University of Colorado, Boulder, USA
Can emerging quantum information technologies, in some way, improve or enhance searches for fundamental physical phenomena? Indeed, the use of optical squeezing in gravitational wave observatories is a beautiful example that they can. In addition to this one prominent example, the search for dark matter may offer several other near-term experiments that can, and perhaps must, use enhanced quantum sensing methods. In particular detail, I’ll discuss the case of searching for a hypothetical dark matter particle known as the axion and accelerating the search using quantum squeezing approaches.
at Zoom