Probing the primordial Universe with MeerKAT and DES

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 $f_{\mathrm{NL}}$ that is up to three times better than Planck.

7 pages, 5 figures, 1 table. We now marginalise over the bias, and ensure that we exclude nonlinear scales, leading to small quantitative corrections. Version accepted by MNRAS

References in corpus (5)

• The imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects
• Measuring primordial non-gaussianity without cosmic variance
• Testing General Relativity with 21 cm intensity mapping
• Einstein's legacy in galaxy surveys
• Constraining primordial non-Gaussianity via a multitracer technique with surveys by Euclid and Square Kilometre Array

Cited by in corpus (15)

• Line-Intensity Mapping: 2017 Status Report
• Disantangling the effects of Doppler velocity and primordial non-Gaussianity in galaxy power spectra
• Intensity mapping from the sky: synergizing the joint potential of [OIII] and [CII] surveys at reionization
• Local primordial non-Gaussianity in the relativistic galaxy bispectrum
• Multi-tracer power spectra and bispectra: Formalism
• Constraining primordial non-Gaussianity by combining next-generation galaxy and 21 cm intensity mapping surveys
• Constraining the growth rate by combining multiple future surveys
• A measurement of the Integrated Sachs-Wolfe Effect with the Rapid ASKAP Continuum Survey
• Unveiling the Universe with Emerging Cosmological Probes
• Decoupling Local Primordial non-Gaussianity from Relativistic Effects in the Galaxy Bispectrum
• Probing Quintessence using BAO imprint on the cross-correlation of weak lensing and post-reionization HI 21 cm signal
• Constraining primordial non-Gaussianity by combining photometric galaxy and 21cm intensity mapping surveys
• Squeezing information from radio surveys to probe the primordial Universe
• Multi-wavelength spectroscopic probes: prospects for primordial non-Gaussianity and relativistic effects
• Primordial non-Gaussianity systematics from redshift mismatch with SPHEREx