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GR: Fachverband Gravitation und Relativitätstheorie

GR 10: Relativistic Astrophysics I

GR 10.4: Talk

Wednesday, March 13, 2024, 15:00–15:20, HBR 14: HS 2

Constraining the Properties of Dark Matter With Gravitational Lensing on Subgalactic Scales — •Felix Heinze — Friedrich-Schiller-Universität Jena, Theoretisch-Physikalisches Institut, Fröbelstieg 1, 07743 Jena

Gravitational lensing is a powerful tool for investigating the distribution and the total content of both luminous and dark matter in galaxies and galaxy clusters. Even small substructures in the form of subhalos can be detected by the perturbative effects they have on the lensing observables, even if no luminous matter is associated with them. It is crucial to understand the lensing effects of these subhalos in detail, as they can be used to infer the structural properties and the abundance of substructures, which in turn allow for constraining the properties of dark matter. A substantial portion of the subhalos that have been detected in the past seem to exhibit concentrations that significantly exceed the predictions made by the cold dark matter model. One possible explanation for this discrepancy that does not invoke alternative dark matter models lies in the potential inadequacy of the theoretical models that have underpinned prior analyses. State-of-the-art cosmological simulations that include the effects of baryons, such as TNG50, indicate that previously used models of subhalo density profiles might not provide an adequate description in the presence of baryons. These studies, implications for future lensing analyses and their ability to constrain dark matter models are going to be discussed in this talk.

Keywords: Dunkle Materie; Gravitationslinsen; Kosmologische Simulationen; Kosmologie