Probing Dark Matter and Dark Energy from Our Cosmic Neighbourhood

by Dr. David Chay Benisty

Leibniz-Institute for Astrophysics Potsdam

at Astrophysics and Cosmology Seminar

Wed, 29 Oct 2025, 11:10
Sacta-Rashi Building for Physics (54), room 207

Abstract

The standard cosmological model, while remarkably successful, faces tensions. A major challenge lies in accurately mapping the distribution of dark matter and reconstructing velocities, as traditional mass and dynamical estimation methods often rely on oversimplified assumptions. In this talk, I will show how we can use the data from the Local Universe (CosmicFlow4) from binary galaxy systems like the Local Group, CenA/M83, to massive clusters such as Coma to address discrepancies in mass estimates. With high-precision data from Gaia and forthcoming surveys such as DESI and 4MOST, together with new techniques to reconstruct velocities and calibrate dynamical mass estimators against simulations like IllustrisTNG and CLUES, I will show how the next generation of dark matter and dark energy constraints will face these issues.

Created on 21-10-2025 by Zitrin, Adi (zitrin)
Updaded on 21-10-2025 by Zitrin, Adi (zitrin)