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Cosmology from HI galaxy surveys with the SKA

Abdalla, Filipe B. and Bull, Philip and Camera, Stefano and Benoit-Lévy, Aurélien and Joachimi, Benjamin and Kirk, Donnacha and Klöckner, Hans-Rainer and Maartens, Roy and Raccanelli, Alvise and Santos, Mario G. and Zhao, Gong-Bo (2015) Cosmology from HI galaxy surveys with the SKA. In: Advancing Astrophysics with the Square Kilometre Array. Proceedings of Science. Vol.215. SISSA , Trieste, Italy, Art. No. 017. ISBN 9781909204706. https://resolver.caltech.edu/CaltechAUTHORS:20180821-090952615

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Abstract

The Square Kilometer Array (SKA) has the potential to produce galaxy redshift surveys which will be competitive with other state of the art cosmological experiments in the next decade. In this chapter we summarise what capabilities the first and the second phases of the SKA will be able to achieve in its current state of design. We summarise the different cosmological experiments which are outlined in further detail in other chapters of this Science Book. The SKA will be able to produce competitive Baryonic Oscillation (BAOs) measurements in both its phases. The first phase of the SKA will provide similar measurements in optical and IR experiments with completely different systematic effects whereas the second phase being transformational in terms of its statistical power. The SKA will produce very accurate Redshift Space Distortions (RSD) measurements, being superior to other experiments at lower redshifts, due to the large number of galaxies. Cross correlations of the galaxy redshift data from the SKA with radio continuum surveys and optical surveys will provide extremely good calibration of photometric redshifts as well as extremely good bounds on modifications of gravity. Basing on a Principle Component Analysis (PCA) approach, we find that the SKA will be able to provide competitive constraint on dark energy and modified gravity models. Due to the large area covered the SKA it will be a transformational experiment in measuring physics from the largest scales such as non-Gaussian signals from fnl . Finally, the SKA might produce the first real time measurement of the redshift drift. The SKA will be a transformational machine for cosmology as it grows from an early Phase 1 to its full power.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.22323/1.215.0017DOIArticle
ORCID:
AuthorORCID
Santos, Mario G.0000-0003-3892-3073
Additional Information:© 2015 owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-ShareAlike. Published on: 2015 May 29.
Series Name:Proceedings of Science
Record Number:CaltechAUTHORS:20180821-090952615
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180821-090952615
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88973
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:21 Aug 2018 18:35
Last Modified:09 Mar 2020 13:19

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