Interne Seminare WS 20/21

Fr. 23.10.2020 09:15 (Zoom)

Master Thesis Presentation:
Tim Herbermann (RWTH)

Dark Matter Density Spikes around Primordial Black Holes

Host: F. Kahlhoefer

 

Fr. 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

 

Fr. 23.10.2020 11:30 (Zoom)

Master Thesis Midterm Presentation:
Carlo Tasillo (RWTH)

Dark phase transitions and gravitational waves

Host: F. Kahlhoefer

 

Fr. 23.10.2020 14:00 (Zoom)

Master Thesis Presentation:
Niklas Becker (RWTH)

Cosmological Constraints on Interacting and Decaying Dark Matter Models

Host: J. Lesgourgues

 

Fr. 23.10.2020 15:00 (Zoom)

Master Thesis Presentation:
Georgios Samaras (RWTH)

Improved neutral networks implementation in Bolztmann codes

Host: J. Lesgourgues

 

Mi. 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

 

 

Do. 12.11.2020 10:00 (Zoom)

Master Thesis Presentation:
Simon Klüttermann (RWTH)

Deep learning for new physics mining at the LHC

Host: M. Krämer

 

Do. 12.11.2020 11:15 (Zoom)

Andrew Cheek (UC Louvain)

New insights into dark matter from EFT basics

Abstract:
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 [arxiv.org] 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. Bernreuther

 

Mi. 25.11.2020 13:30 (Zoom)

Master Thesis Presentation:
Joshua Schophoven (RWTH)

Methods for Higher Order Renormalisation of Quantum Field Theories

Host: R. Harlander

 

Mi. 25.11.2020 14:30 (Zoom)

Master Thesis Presentation:
Magnus Schaaf (RWTH)

Threshold Expansion of Gluon Fusion Processes

Host: R. Harlander

 

Mi. 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

Abstract:
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

 

Mi. 16.12.2020 10:00 (Zoom)

Verteidigung der Doktorarbeit:
Torsten Weber (RWTH)

Decay modelling in tt production in association with an additional photon

Host: M. Worek

 

Mi. 16.12.2020 15:00 (Zoom)

Verteidigung der Doktorarbeit:
Benjamin Summ (RWTH)

One Formula To Match Them All: The Bispinor Universal One-Loop Effective Action

Host: M. Krämer

 

Mi. 20.01.2021 16:00 (Zoom)

Colloquium of the CRC TRR 257:

Susanne Westhoff (Uni Heidelberg)

The Flavor of UV Physics

Abstract:
New physics not far above the TeV scale should leave a pattern of virtual effects in observables at lower energies. What do these effects tell us about the structure of a UV theory? We will address this question in the framework of the Standard Model Effective Field Theory, where we can explore patterns of effective couplings to learn about physics at high energies. I will show you how to do this by combining top and bottom observables at different energy scales.

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

 

Mi. 24.03.2021 14:00 (Zoom)

Verteidigung der Doktorarbeit:
Fabian Lange (RWTH)

Applications of the perturbative gradient flow at higher orders in quantum chromodynamics

Host: R. Harlander

 

Do. 25.03.2021 9:15 (Zoom)

4 Master Thesis Mid-Term Presentations

 

09:15-09:45 : Lena Rathmann (RWTH)
Development and validation of likelihoods for the surveys of the Euclid satellite
10:00-10:30 : Andrea Perez Sanchez (RWTH)
Comparison of the potential of various cosmological models to solve the Hubble tension
10:45-11:00 : break
11:00-11:45 : Pol Heuschling (RWTH)
Correcting Newtonian N-body simulations for the effect of massive neutrinos and decaying modes
11:45-12:30 : Florian Stadtmann (RWTH)
Boosting CLASS with neural networks: tests and validations

Host: J. Lesgourgues