A Slight Excess of Large Scale Power from Moments of the Peculiar Velocity Field
arXiv:1010.2651 · doi:10.1111/j.1365-2966.2011.18426.x
Abstract
The peculiar motions of galaxies can be used to infer the distribution of matter in the Universe. It has recently been shown that measurements of the peculiar velocity field indicates an anomalously high bulk flow of galaxies in our local volume. In this paper we find the implications of the high bulk flow for the power spectrum of density fluctuations. We find that analyzing only the dipole moment of the velocity field yields an average power spectrum amplitude which is indeed much higher than the LCDM value. However, by also including shear and octupole moments of the velocity field, and marginalizing over possible values for the growth rate, an average power spectrum amplitude which is consistent with LCDM is recovered. We attempt to infer the shape of the matter power spectrum from moments of the velocity field, and find a slight excess of power on scales ~ h-1 Gpc.
6 pages,6 figures, updated to match accepted version
References in corpus (3)
Cited by in corpus (24)
- Interpreting large-scale redshift-space distortion measurements
- Revisiting the NVSS number count dipole
- Are peculiar velocity surveys competitive as a cosmological probe?
- Measuring cosmic bulk flows with Type Ia Supernovae from the Nearby Supernova Factory
- Cosmic bulk flows on 50 {h}^{-1}Mpc scales: A Bayesian hyper-parameter method and multishells likelihood analysis
- Bayesian 3d velocity field reconstruction with VIRBIuS
- An estimation of local bulk flow with the maximum-likelihood method
- A Fast Route to Modified Gravitational Growth
- Large-scale Cosmic Flows from Cosmicflows-2 Catalog
- Detected fluctuations in SDSS LRG magnitudes: Bulk flow signature or systematic?
- Studying the Peculiar Velocity Bulk Flow in a Sparse Survey of Type-Ia SNe
- Bulk flow of halos in ΛCDM simulation
- Local Hole revisited: evidence for bulk motions and self-consistent outflow
- Easily Interpretable Bulk Flows: Continuing Tension with the Standard Cosmological Model
- Deep NIR photometry of HI galaxies in the Zone of Avoidance
- Preferred axis of CMB parity asymmetry in the masked maps
- Testing the minimum variance method for estimating large-scale velocity moments
- Constraining cosmology with pairwise velocity estimator
- The Peculiar Velocity Correlation Function
- Testing General Relativity with the Doppler magnification effect
- A gauge-invariant approach to interactions in the dark sector
- Anomalous anisotropic cross-correlations between WMAP CMB maps and SDSS galaxy distribution and implications on the dark flow scenario
- The art of building a smooth cosmic distance ladder in a perturbed universe
- Improved Methods for Estimating Peculiar Velocity Correlation Functions Using Volume Weighting