Cosmology on the largest scales with the SKA
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Date
2014
Journal Title
Journal ISSN
Volume Title
Publisher
Proceedings of Science
Abstract
The study of the Universe on ultra-large scales is one of the major science cases for the Square
Kilometre Array (SKA). The SKA will be able to probe a vast volume of the cosmos, thus representing
a unique instrument, amongst next-generation cosmological experiments, for scrutinising
the Universe’s properties on the largest cosmic scales. Probing cosmic structures on extremely
large scales will have many advantages. For instance, the growth of perturbations is well understood
for those modes, since it falls fully within the linear régime. Also, such scales are unaffected
by the poorly understood feedback of baryonic physics. On ultra-large cosmic scales, two key effects
become significant: primordial non-Gaussianity and relativistic corrections to cosmological
observables. Moreover, if late-time acceleration is driven not by dark energy but by modifications
to general relativity, then such modifications should become apparent near and above the horizon
scale. As a result, the SKA is forecast to deliver transformational constraints on non-Gaussianity
and to probe gravity on super-horizon scales for the first time.
Description
Advancing Astrophysics with the Square Kilometre Array
June 8-13, 2014
Giardini Naxos, Italy
Keywords
Square Kilometre Array (SKA), Galaxies, Cosmology, Modified gravity (MG), Primordial non-Gaussianity (PNG), General relativity (GR)
Citation
Camera, S., et al., (2014). Cosmology on the largest scales with the SKA. Paper presented at Advancing Astrophysics with the Square Kilometre Array, Giardini Naxos, Italy. PoS(AASKA14)025