Göttingen 2025 – wissenschaftliches Programm

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GR: Fachverband Gravitation und Relativitätstheorie

GR 10: Cosmo II

GR 10.5: Vortrag

Donnerstag, 3. April 2025, 15:15–15:35, ZHG008

Constraining Mixed Dark Matter Scenarios in the Framework of Perturbation Theory — •Safak Celik and Fabian Schmidt — Max Planck Institute for Astrophysics, Garching bei München, Germany

In this study, we explore the dynamics of mixed dark matter scenarios, focusing on the interplay between cold dark matter (CDM) and warm dark matter (WDM) components. Utilizing perturbation theory techniques, we analyze the evolution of perturbations in a cosmological context where CDM constitutes the primary dark matter component, while WDM, characterized by a weakly interacting, thermally produced mass in the eV-keV range, serves as a secondary component. While the effects of WDM on the linear power spectrum, governed by its mass and abundance, are well-documented, our research delves into the non-linear evolution of these systems. We particularly investigate the role of isocurvature perturbations between the two dark matter components and their impact on the evolution process. Employing a 1-loop galaxy power spectrum, we conduct a Fisher forecast analysis to constrain key parameters, including the fraction and mass of the WDM component and galaxy bias parameters, while examining the degeneracies among them. Our findings enhance the understanding of mixed dark matter models and their implications for cosmological observations.

Keywords: Mixed dark matter; Large scale structure; Perturbation theory