eprintid: 1543024 rev_number: 23 eprint_status: archive userid: 608 dir: disk0/01/54/30/24 datestamp: 2017-10-30 17:08:38 lastmod: 2020-02-12 18:31:15 status_changed: 2017-10-30 17:08:38 type: proceedings_section metadata_visibility: show creators_name: Kirk, D creators_name: Benoit-Lévy, A creators_name: Abdalla, FB creators_name: Bull, P creators_name: Joachimi, B title: Cross correlation surveys with the Square Kilometre Array ispublished: pub divisions: UCL divisions: A01 divisions: B04 divisions: C06 divisions: F60 note: Copyright © owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence. abstract: By the time that the first phase of the Square Kilometre Array is deployed it will be able to perform state of the art Large Scale Structure (LSS) as well as Weak Gravitational Lensing (WGL) measurements of the distribution of matter in the Universe. In this chapter we concentrate on the synergies that result from cross-correlating these different SKA data products as well as external correlation with the weak lensing measurements available from CMB missions. We show that the Dark Energy figures of merit obtained individually from WGL/LSS measurements and their independent combination is significantly increased when their full cross-correlations are taken into account. This is due to the increased knowledge of galaxy bias as a function of redshift as well as the extra information from the different cosmological dependences of the cross-correlations. We show that the cross-correlation between a spectroscopic LSS sample and a weak lensing sample with photometric redshifts can calibrate these same photometric redshifts, and their scatter, to high accuracy by modelling them as nuisance parameters and fitting them simultaneously cosmology. Finally we show that Modified Gravity parameters are greatly constrained by this cross-correlations because weak lensing and redshift space distortions (from the LSS survey) break strong degeneracies in common parameterisations of modified gravity. date: 2014 publisher: Proceedings of Science official_url: https://pos.sissa.it/215/ oa_status: green full_text_type: pub language: eng primo: open primo_central: open_green verified: verified_manual elements_id: 1008928 lyricists_name: Abdalla, Filipe lyricists_name: Joachimi, Benjamin lyricists_id: FBABD21 lyricists_id: BJOAC26 actors_name: Waragoda Vitharana, Nimal actors_id: NWARR44 actors_role: owner full_text_status: public series: Proceedings of Science volume: 2014 place_of_pub: Giardini Naxos, Italy event_title: Advancing Astrophysics with the Square Kilometre Array 2014 book_title: Proceedings of Science - Advancing Astrophysics with the Square Kilometre Array 2014 citation: Kirk, D; Benoit-Lévy, A; Abdalla, FB; Bull, P; Joachimi, B; (2014) Cross correlation surveys with the Square Kilometre Array. In: Proceedings of Science - Advancing Astrophysics with the Square Kilometre Array 2014. Proceedings of Science: Giardini Naxos, Italy. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/1543024/1/1501.03848v1.pdf