The power spectrum and bispectrum of SDSS DR11 BOSS galaxies – I. Bias and gravity

By H. Gil-Marín, J. Noreña, L. Verde, Will J. Percival, C. Wagner, Marc Manera, D. Schneider. 2014

193 citations recorded by the source corpus.

We analyse the anisotropic clustering of the Baryon Oscillation Spectroscopic Survey (BOSS) CMASS Data Release 11 sample, which consists of $690 827$ galaxies in the redshift range 0.43 < z < 0.70 and has a sky coverage of 8498 deg2 corresponding to an effective volume of ˜ 6 Gpc3. We fit the Fourier space statistics, the power spectrum and bispectrum monopoles to measure the linear and quadratic bias parameters, b1 and b2, for a non-linear non-local bias model, the growth of structure parameter f and the amplitude of dark matter density fluctuations parametrized by sigma8. We obtain b1(zeff)1.40sigma8(zeff) = 1.672 ± 0.060 and b_2^{0.30}(z_eff)sigma _8(z_eff)=0.579± 0.082 at the effective redshift of the survey, zeff = 0.57. The main cosmological result is the constraint on the combination f 0.43(zeff)sigma8(zeff) = 0.582 ± 0.084, which is complementary to fsigma8 constraints obtained from two-point redshift-space distortion analyses. A less conservative analysis yields f 0.43(zeff)sigma8(zeff) = 0.584 ± 0.051. We ensure that our result is robust by performing detailed systematic tests using a large suite of survey galaxy mock catalogues and N-body simulations. The constraints on f 0.43sigma8 are useful for setting additional constraints on neutrino mass, gravity, curvature as well as the number of neutrino species from galaxy surveys analyses (as presented in a companion paper).

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/3fb7325bc2d4f8e0497faa7fe658392de2af2527

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Citations in the corpus

Cosmological parameters from the BOSS galaxy power spectrum (2019, background): “Note that the degeneracy between As, ∑ mν and the galaxy bias can, in principle, be alleviated by the bispectrum data [51, 52].”
SDSS-III Baryon Oscillation Spectroscopic Survey Data Release 12: galaxy target selection and large-scale structure catalogues (2015, methodology): “BAO measurements are presented in configuration-space (Cuesta et al. 2015) and Fourier-space (GilMarin et al. 2015c), and RSD measurements made in Fourier-space are presented in Gil-Marin et al. (2015d).”