eprintid: 1523701 rev_number: 23 eprint_status: archive userid: 608 dir: disk0/01/52/37/01 datestamp: 2016-10-30 10:53:49 lastmod: 2021-11-23 00:56:56 status_changed: 2017-09-01 14:37:14 type: proceedings_section metadata_visibility: show creators_name: Santos, MG creators_name: Bull, P creators_name: Alonso, D creators_name: Camera, S creators_name: Ferreira, PG creators_name: Bernardi, G creators_name: Maartens, R creators_name: Viel, M creators_name: Villaescusa-Navarro, F creators_name: Abdalla, FB creators_name: Jarvis, M creators_name: Metcalf, RB creators_name: Pourtsidou, A creators_name: Wolz, L title: Cosmology with a SKA HI intensity mapping survey ispublished: pub divisions: UCL divisions: B04 divisions: C06 divisions: F60 keywords: astro-ph.CO, astro-ph.CO, astro-ph.IM, gr-qc note: © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence abstract: HI intensity mapping (IM) is a novel technique capable of mapping the large-scale structure of the Universe in three dimensions and delivering exquisite constraints on cosmology, by using HI as a biased tracer of the dark matter density field. This is achieved by measuring the intensity of the redshifted 21cm line over the sky in a range of redshifts without the requirement to resolve individual galaxies. In this chapter, we investigate the potential of SKA1 to deliver HI intensity maps over a broad range of frequencies and a substantial fraction of the sky. By pinning down the baryon acoustic oscillation and redshift space distortion features in the matter power spectrum -- thus determining the expansion and growth history of the Universe -- these surveys can provide powerful tests of dark energy models and modifications to General Relativity. They can also be used to probe physics on extremely large scales, where precise measurements of spatial curvature and primordial non-Gaussianity can be used to test inflation; on small scales, by measuring the sum of neutrino masses; and at high redshifts where non-standard evolution models can be probed. We discuss the impact of foregrounds as well as various instrumental and survey design parameters on the achievable constraints. In particular we analyse the feasibility of using the SKA1 autocorrelations to probe the large-scale signal. date: 2015-05-28 official_url: https://pos.sissa.it/215/019/ oa_status: green full_text_type: pub language: eng primo: open primo_central: open_green verified: verified_manual elements_id: 1008931 lyricists_name: Abdalla, Filipe lyricists_id: FBABD21 full_text_status: public series: Proceedings of Science publication: PoS AASKA volume: 14 place_of_pub: Giardini Naxos (Italy) event_title: Advancing Astrophysics with the Square Kilometre Array book_title: Advancing Astrophysics with the Square Kilometre Array citation: Santos, MG; Bull, P; Alonso, D; Camera, S; Ferreira, PG; Bernardi, G; Maartens, R; ... Wolz, L; + view all <#> Santos, MG; Bull, P; Alonso, D; Camera, S; Ferreira, PG; Bernardi, G; Maartens, R; Viel, M; Villaescusa-Navarro, F; Abdalla, FB; Jarvis, M; Metcalf, RB; Pourtsidou, A; Wolz, L; - view fewer <#> (2015) Cosmology with a SKA HI intensity mapping survey. In: Advancing Astrophysics with the Square Kilometre Array. : Giardini Naxos (Italy). Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/1523701/1/Abdalla_1501.03989v1.pdf