[Journal Club] Muon g-2 from muonium spectroscopy
2021-10-05 11:00 - 12:00 (Europe/Paris)

Hierarchical three-body problem
2021-10-14 11:00 - 12:00
Abstract : The motion of three bodies can be solved perturbatively when a tightly bound inner binary is orbited by a distant perturber on an elliptic orbit. The exchange of angular momentum between the two orbits gives rise to Kozai-Lidov oscillations of eccentricity and inclination characterizing many different systems in astronomy. In this talk, I will first review the Newtonian version of the Kozai-Lidov mechanism before introducing the effect of relativistic corrections with applications to gravitational wave astronomy. I will show how one can systematically compute first post-Newtonian terms in the hierarchical three-body problem and discuss their influence on the dynamics of the system.
Finally, I will present a new kind of relativistic resonance and its effect on the eccentricity of the inner binary, which could potentially be measurable in the phase of gravitational waves.

[Journal Club] Scalar potentials and the de Sitter swampland conjecture
2021-10-19 11:00 - 12:00
Some content and references can be found in the review 1903.06239 or the introduction of 2004.00030.

Warm dark matter constraints using indirect searches
2021-10-21 11:00 - 12:00
Warm dark matter (WDM) could explain some small-scale structure observations that have challenged the cold dark matter (CDM) model, as warm particles suppress structure formation due to free streaming effects. Observing small-scale structure thus provides a valuable way to distinguish between CDM and WDM. In this talk, I will present a semi-analytical model for the dark matter substructure evolution. Satellite galaxies form within dark matter subhaloes, and I will discuss constraints on WDM models based on the observed number of satellites in the Milky Way. Moreover, warm particles such as sterile neutrinos and axion-like particles can decay into photons, which are consequently detectable by X-ray telescopes. eROSITA will perform an all-sky X-ray survey, of which I will present its sensitivity to identify dark matter decay with narrow X-ray line emission.

Scalars and potentials
2021-10-25 09:00 - 2021-10-26 17:00
Please see the following website for all information: https://indico.cern.ch/event/888220/
