# Relativistic corrections and non-Gaussianity in radio continuum surveys

@article{Maartens2013RelativisticCA,
title={Relativistic corrections and non-Gaussianity in radio continuum surveys},
author={Roy Maartens and Gong-Bo Zhao and David Bacon and Kazuya Koyama and Alvise Raccanelli},
journal={Journal of Cosmology and Astroparticle Physics},
year={2013},
volume={2013},
pages={044-044}
}
Forthcoming radio continuum surveys will cover large volumes of the observable Universe and will reach to high redshifts, making them potentially powerful probes of dark energy, modified gravity and non-Gaussianity. We consider the continuum surveys with LOFAR, WSRT and ASKAP, and examples of continuum surveys with the SKA. We extend recent work on these surveys by including redshift space distortions and lensing convergence in the radio source auto-correlation. In addition we compute the…

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## References

SHOWING 1-10 OF 70 REFERENCES
Cosmological Measurements with Forthcoming Radio Continuum Surveys
We present forecasts for constraints on cosmological models which can be obtained by forthcoming radio continuum surveys: the wide surveys with the LOw Frequency ARray (LOFAR), Australian Square
Impact of redshift information on cosmological applications with next-generation radio surveys
In this paper, we explore how the forthcoming generation of large-scale radio continuum surveys, with the inclusion of some degree of redshift information, can constrain cosmological parameters. By
Large-scale clustering of galaxies in general relativity
• Physics
• 2012
Several recent studies have shown how to properly calculate the observed clustering of galaxies in a relativistic context, and uncovered corrections to the Newtonian calculation that become
Disentangling non-Gaussianity, bias and general relativistic effects in the galaxy distribution
• Physics
• 2012
Local non-Gaussianity, parametrized by fNL, introduces a scale-dependent bias that is strongest at large scales, precisely where General Relativistic (GR) effects also become significant. With future
LOFAR and APERTIF Surveys of the Radio Sky: Probing Shocks and Magnetic Fields in Galaxy Clusters
At very low frequencies, the new pan-European radio telescope LOFAR is opening the last unexplored window of the electromagnetic spectrum for astrophysical studies. The revolutionary APERTIF- phased
Interpreting large-scale redshift-space distortion measurements
• Physics
• 2011
The simplest theory describing large-scale redshift-space distortions (RSD), based on linear theory and distant galaxies, depends on the growth of cosmological structure, suggesting that strong tests
The linear power spectrum of observed source number counts
• Physics
• 2011
We relate the observable number of sources per solid angle and redshift to the underlying proper source density and velocity, background evolution and line-of-sight potentials. We give an exact
Constraining Primordial Non-Gaussianity with High-Redshift Probes
We present an analysis of the constraints on the amplitude of primordial non-Gaussianity of local type described by the dimensionless parameter fNL. These constraints are set by the auto-correlation
General Relativistic Description of the Observed Galaxy Power Spectrum: Do We Understand What We Measure?
We extend the general relativistic description of galaxy clustering developed in Yoo, Fitzpatrick, and Zaldarriaga (2009). For the first time we provide a fully general relativistic description of
Galaxy Bias and non-Linear Structure Formation in General Relativity
• Physics
• 2011
Length scales probed by the large scale structure surveys are becoming closer and closer to the horizon scale. Further, it has been recently understood that non-Gaussianity in the initial conditions