Internal Seminars WS 20/21

Fri 23.10.2020 09:15 (Zoom)

Master Thesis Presentation:
Tim Herbermann (RWTH)

Dark Matter Density Spikes around Primordial Black Holes

Host: F. Kahlhoefer


Fri 23.10.2020 10:30 (Zoom)

Master Thesis Presentation:
Jann Aschersleben (RWTH)

X-ray Studies of the Galaxy Group UGC03957 using eROSITA, XMM-Newton and Suzako data

Host: F. Kahlhoefer


Fri 23.10.2020 11:30 (Zoom)

Master Thesis Midterm Presentation:
Carlo Tasillo (RWTH)

Dark phase transitions and gravitational waves

Host: F. Kahlhoefer


Fri 23.10.2020 14:00 (Zoom)

Master Thesis Presentation:
Niklas Becker (RWTH)

Cosmological Constraints on Interacting and Decaying Dark Matter Models

Host: J. Lesgourgues


Fri 23.10.2020 15:00 (Zoom)

Master Thesis Presentation:
Georgios Samaras (RWTH)

Improved neutral networks implementation in Bolztmann codes

Host: J. Lesgourgues


Wed 11.11.2020 14:00 (Zoom)

3 Master Thesis Presentations:


2pm: Hanno Jacobs (RWTH), "TeV Gamma-Ray Halos Around Pulsar Wind Nebulae"
3pm: Michel Simon (RWTH), "Cosmic Ray Protons and Antiprotons in an Extended Force-Field Model"
4pm: Maike Doerenkamp (RWTH), "Cosmological forecast validation for the EUCLID satellite collaboration"

Host: P. Mertsch


Thu 12.11.2020 10:00 (Zoom)

Master Thesis Presentation:
Simon Klüttermann (RWTH)

Deep learning for new physics mining at the LHC

Host: M. Krämer



Thu 12.11.2020 11:15 (Zoom)

Andrew Cheek (UC Louvain)

New insights into dark matter from EFT basics

When revisiting studies of effective interactions between fermionic dark matter and photons, we noticed that previous treatments violate gauge invariance, which, as is usual, has huge consequences. In arXiv:2005.12789 [] we address this and present an update on the collider, direct and indirect experimental constraints for operators of dimension 5 and 6. Unlike previous works, we stress the important effect gauge invariance has on dark matter even when its mass is well below the electroweak scale. This leads to a  better picture of what we can reasonably expect from future dark matter searches. One particular insight is that anapole dark matter is unlikely to be seen soon in direct detection experiments because gauge invariance suggests that the constraints coming from the invisible width of the Z-boson are much stronger.

Host: E. Bernreuthe


Wed 25.11.2020 13:30 (Zoom)

Master Thesis Presentation:
Joshua Schophoven (RWTH)

Methods for Higher Order Renormalisation of Quantum Field Theories

Host: R. Harlander


Wed 25.11.2020 14:30 (Zoom)

Master Thesis Presentation:
Magnus Schaaf (RWTH)

Threshold Expansion of Gluon Fusion Processes

Host: R. Harlander


Wed 02.12.2020 16:00 (Zoom)

Colloquium of the CRC TRR 257:

Guido Bell (Uni Siegen)

Soft-Collinear Effective Theory 20 years later: more logs, more jets and more orders

Many observables at collider experiments are sensitive to soft and collinear QCD radiation. The underlying dynamics can be phrased in terms of an effective-field-theory language, which was developed around 20 years ago in the context of charmless B-meson decays. Soft-Collinear Effective Theory (SCET) nowadays finds application in many different branches of particle physics, ranging from flavour and collider observables to heavy-ion physics and dark matter annihilation. In this talk I will review some of the latest SCET developments, which aim at pushing the accuracy to higher logarithmic orders, extending the resummations to more complicated jet observables and in resumming logarithms at subleading order in the power expansion.

The first 30 minutes are reserved for a discussion session with students and young postdocs. The actual talk starts at 16.30.

Host: Kirill Melnikov