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

Ixandra Achitouv (1, 2)

1 LUTH (UMR_8102) - Laboratoire Univers et Théories
2 APC (UMR_7164) - AstroParticule et Cosmologie

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 12th data release (DR12) of SDSS. Using a simple multipole analysis we recover a value consistent with ΛCDM for the inferred linear growth rate normalized by the linear bias: the β parameter. We find β=0.33±0.11 for the LOWZ sample and β=0.36±0.05 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 modeling.

Mots clés: Cosmology

Domaines: Astrophysique [astro-ph]; Astrophysique [astro-ph]

Ixandra Achitouv. New constraints on the linear growth rate using cosmic voids in the SDSS DR12 datasets. Physical Review D, 2019, 100 (12), pp.123513. ⟨10.1103/PhysRevD.100.123513⟩. ⟨hal-02080710⟩