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