New constraints on the linear growth rate using cosmic voids in the SDSS DR12 datasets. (arXiv:1903.05645v1 [astro-ph.CO])

New constraints on the linear growth rate using cosmic voids in the SDSS DR12 datasets. (arXiv:1903.05645v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Achitouv_I/0/1/0/all/0/1">Ixandra Achitouv</a>

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 $beta=0.33pm0.06$ for the LOWZ sample
and $beta=0.36pm0.05$ 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.

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 $beta=0.33pm0.06$ for the LOWZ sample
and $beta=0.36pm0.05$ 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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