Probing the primordial Universe with MeerKAT and DES

TL;DR

This paper demonstrates that combining MeerKAT and DES surveys using the multi-tracer technique can significantly improve constraints on primordial non-Gaussianity, surpassing current Planck results with existing data.

Contribution

It introduces a novel approach of combining MeerKAT and DES data with multi-tracer analysis to enhance primordial non-Gaussianity measurements.

Findings

Combined surveys can improve $f_{NL}$ constraints by up to three times.

Existing surveys can outperform future experiments like Euclid and LSST in this context.

Multi-tracer technique effectively reduces cosmic variance in measurements.

Abstract

It is usually assumed that we will need to wait until next-generation surveys like Euclid, LSST and SKA, in order to improve on the current best constraints on primordial non-Gaussianity from the Planck experiment. We show that two contemporary surveys, with the SKA precursor MeerKAT and the Dark Energy Survey (DES), can be combined using the multi-tracer technique to deliver an accuracy on measurement of $f_{\rm NL}$ that is up to three times better than Planck.