Model Independent Dark Matter Properties from Cosmic Growth

TL;DR

This paper investigates the properties of dark matter using a model-independent approach based on cosmic growth measurements, aiming to detect deviations from the standard model across different redshifts.

Contribution

It introduces a model-independent method to constrain dark matter properties using cosmic structure survey data across multiple redshift bins.

Findings

Constraints at 3-14% level in four redshift bins

Effective testing of deviations from standard dark matter model

Utilizes redshift space distortions and peculiar velocities

Abstract

Dark matter dominates the matter budget of the universe but its nature is unknown. Deviations from the standard model, where dark matter clusters with the same gravitational strength as baryons, and has the same pressureless equation of state as baryons, can be tested by cosmic growth measurements. We take a model independent approach, allowing deviations in bins of redshift, and compute the constraints enabled by ongoing cosmic structure surveys through redshift space distortions and peculiar velocities. These can produce constraints at the $3-14\%$ level in four independent redshift bins over $z=[0,4]$.