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Publication Details
Output Category: C1
Strategic Research Area: None
TISI Citations: PlumX StatisticsPlumX Statistics
Scopus Citations:
Journal Impact: 4.95
All Authors: Watts, A, Elahi, P, Lewis, G, Power, C Number:
UWA Authors: Watts, A., Elahi, P., Power, C. Number: 3
Title: Large-scale structure topology in non-standard cosmologies: Impact of dark sector physics
ISBN/ISSN 0035-8711
Year: 2017
Pages: 59-68
Volume: 468
Issue: 1
Full Reference (Harvard Style): Watts, A., Elahi, P., Lewis, G., Power, C. 2017, 'Large-scale structure topology in non-standard cosmologies: Impact of dark sector physics', MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 468, 1, pp. 59-68.

Even as our measurements of cosmological parameters improve, the physical nature of the dark sector of the universe largely remains a mystery. Many effects of dark sector models are most prominent at very large scales and will rely on future galaxy surveys to elucidate. In this paper, we compare the topological properties of the large-scale dark matter distribution in a number of cosmological models using hydrodynamical simulations and the cosmological genus statistic. Genus curves are computed from z = 11 to 0 for ? cold dark matter (?CDM), quintessence and warm dark matter (WDM) models, over a scale range of 1-20 h-1 Mpc. The curves are analysed in terms of their Hermite spectra to describe the power contained in non-Gaussian deformations to the cosmological density field. We find that the ?CDM and ?WDM models produce nearly identical genus curves indicating no topological differences in structure formation. The quintessence model, which differs solely in its expansion history, produces significant differences in the strength and redshift evolution of non-Gaussian modes associated with higher cluster abundances and lower void abundances. These effects are robust to cosmic variance and are characteristically different from those produced by tweaking the parameters of a ?CDM model. Given the simplicity and similarity of the models, detecting these discrepancies represents a promising avenue for understanding the effect of non-standard cosmologies on large-scale structure.