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arxiv: 1811.02743 · v1 · pith:C7Z7B3FU · submitted 2018-11-07 · astro-ph.CO

Cosmology with Phase 1 of the Square Kilometre Array; Red Book 2018: Technical specifications and performance forecasts

Square Kilometre Array Cosmology Science Working Group: David J. Bacon , Richard A. Battye , Philip Bull , Stefano Camera , Pedro G. Ferreira , Ian Harrison , David Parkinson , Alkistis Pourtsidou
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Mario G. Santos Laura Wolz Filipe Abdalla Yashar Akrami David Alonso Sambatra Andrianomena Mario Ballardini Jose Luis Bernal Daniele Bertacca Carlos A.P. Bengaly Anna Bonaldi Camille Bonvin Michael L. Brown Emma Chapman Song Chen Xuelei Chen Steven Cunnington Tamara M. Davis Clive Dickinson Jose Fonseca Keith Grainge Stuart Harper Matt J. Jarvis Roy Maartens Natasha Maddox Hamsa Padmanabhan Jonathan R. Pritchard Alvise Raccanelli Marzia Rivi Sambit Roychowdhury Martin Sahlen Dominik J. Schwarz Thilo M. Siewert Matteo Viel Francisco Villaescusa-Navarro Yidong Xu Daisuke Yamauchi Joe Zuntz
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We present a detailed overview of the cosmological surveys that will be carried out with Phase 1 of the Square Kilometre Array (SKA1), and the science that they will enable. We highlight three main surveys: a medium-deep continuum weak lensing and low-redshift spectroscopic HI galaxy survey over 5,000 sqdeg; a wide and deep continuum galaxy and HI intensity mapping survey over 20,000 sqdeg from z = 0.35 - 3; and a deep, high-redshift HI intensity mapping survey over 100 sqdeg from z = 3 - 6. Taken together, these surveys will achieve an array of important scientific goals: measuring the equation of state of dark energy out to z ~ 3 with percent-level precision measurements of the cosmic expansion rate; constraining possible deviations from General Relativity on cosmological scales by measuring the growth rate of structure through multiple independent methods; mapping the structure of the Universe on the largest accessible scales, thus constraining fundamental properties such as isotropy, homogeneity, and non-Gaussianity; and measuring the HI density and bias out to z = 6. These surveys will also provide highly complementary clustering and weak lensing measurements that have independent systematic uncertainties to those of optical surveys like LSST and Euclid, leading to a multitude of synergies that can improve constraints significantly beyond what optical or radio surveys can achieve on their own. This document, the 2018 Red Book, provides reference technical specifications, cosmological parameter forecasts, and an overview of relevant systematic effects for the three key surveys, and will be regularly updated by the Cosmology Science Working Group in the run up to start of operations and the Key Science Programme of SKA1.

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