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arXiv · 1903.05645

New constraints on the linear growth rate using cosmic voids in the SDSS DR12 datasets

Ixandra Achitouv
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Abstract

We present a new analysis of the inferred growth rate of cosmic structure measured around voids, using the LOWZ and the CMASS samples in the twelfth data release (DR12) of SDSS. Using a simple multipole analysis we recover a value consistent with $\Lambda$CDM for the inferred linear growth rate normalized by the linear bias: the $\beta$ parameter. This is true in both the mock catalogues and the data, where we find $\beta=0.33\pm0.06$ for the LOWZ sample and $\beta=0.36\pm0.05$ for the CMASS sample. This work demonstrates that we can expect redshift-space distortions around voids to provide unbiased and accurate constraints on the growth rate, complementary to galaxy clustering, using simple linear modelling.

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Ixandra Achitouv. 2019-03-13. New constraints on the linear growth rate using cosmic voids in the SDSS DR12 datasets. https://doi.org/10.1103/physrevd.100.123513

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