Direct Determination of Expansion History Using Redshift Distortions
arXiv:1210.6596 · doi:10.1103/PhysRevD.87.023005
Abstract
We investigate the direct determination of expansion history using redshift distortions without plugging into detailed cosmological parameters. The observed spectra in redshift space include a mixture of information: fluctuations of density-density and velocity-velocity spectra, and distance measures of perpendicular and parallel components to the line of sight. Unfortunately it is hard to measure all the components simultaneously without any specific prior assumption. Common prior assumptions include a linear/quasi-linear model of redshift distortions or a model for the shape of the power spectra, which eventually breaks down on small scales at later epochs where nonlinear structure formation disturbs coherent growth. The degeneracy breaking, between the effect of cosmic distances and redshift distortions for example, depends on the prior we assume. An alternative approach is to utilize the cosmological principle inscribed in the heart of the Friedmann-Lematre-Robertson-Walker (hereafter FLRW) universe, that is, the specific relation between the angular diameter distance and the Hubble parameter, in this degeneracy breaking. We show that utilizing this FLRW prior early in the step of distinguishing the distance effect from redshift distortions helps us improve the detectability of power spectra and distance measures with no leaning on a combination of other experiments.
arXiv comment10 pages, 7 figures, published in Physical Review D
References in corpus (42)
- Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
- Measurements of Omega and Lambda from 42 High-Redshift Supernovae
- The Sloan Digital Sky Survey: Technical Summary
- Is Cosmic Speed-Up Due to New Gravitational Physics?
- Baryonic Features in the Matter Transfer Function
- Cosmological Constraints from the SDSS Luminous Red Galaxies
- The Luminosity and Color Dependence of the Galaxy Correlation Function
- The 2dF Galaxy Redshift Survey: correlation functions, peculiar velocities and the matter density of the Universe
- Probing Dark Energy with Baryonic Acoustic Oscillations from Future Large Galaxy Redshift Surveys
- A measurement of the cosmological mass density from clustering in the 2dF Galaxy Redshift Survey
- A test of the nature of cosmic acceleration using galaxy redshift distortions
- Clustering of Luminous Red Galaxies IV: Baryon Acoustic Peak in the Line-of-Sight Direction and a Direct Measurement of H(z)
- Redshift-Space Distortions, Pairwise Velocities and Nonlinearities
- Probing dark energy using baryonic oscillations in the galaxy power spectrum as a cosmological ruler
- The Large Scale Structure of f(R) Gravity
- The WiggleZ Dark Energy Survey: Survey Design and First Data Release
- The WiggleZ Dark Energy Survey: the growth rate of cosmic structure since redshift z=0.9
- Resumming Cosmological Perturbations via the Lagrangian Picture: One-loop Results in Real Space and in Redshift Space
- Cosmological Constraints from the Clustering of the Sloan Digital Sky Survey DR7 Luminous Red Galaxies
- Nonlinear Evolution of Baryon Acoustic Oscillations
- Baryon Acoustic Oscillations in 2D: Modeling Redshift-space Power Spectrum from Perturbation Theory
- Metastable Gravitons and Infinite Volume Extra Dimensions
- Reconstructing the history of structure formation using redshift distortions
- Interpreting large-scale redshift-space distortion measurements
- Testing cosmological structure formation using redshift-space distortions
- How to measure redshift-space distortions without sample variance
- Observational Tests of Modified Gravity
- The Baryonic Acoustic Feature and Large-Scale Clustering in the SDSS LRG Sample
- Testing LCDM with the Growth Function δ(a): Current Constraints
- Forecasting Cosmological Constraints from Redshift Surveys
- On The Validity of the Streaming Model for the Redshift-Space Correlation Function in the Linear Regime
- Modelling redshift space distortions in hierarchical cosmologies
- Differentiating dark energy and modified gravity with galaxy redshift surveys
- Redshift space correlations and scale-dependent stochastic biasing of density peaks
- Perturbation Theory Reloaded II: Non-linear Bias, Baryon Acoustic Oscillations and Millennium Simulation In Real Space
- Consistency test of general relativity from large scale structure of the Universe
- Mapping Growth and Gravity with Robust Redshift Space Distortions
- Distribution function approach to redshift space distortions. Part II: N-body simulations
- Dark Energy Constraints from Baryon Acoustic Oscillations
- Measuring Coherent Motions in the Universe
- Likelihood reconstruction method of real-space density and velocity power spectra from a redshift galaxy survey
- Decomposition of Spectra from Redshift Distortion Maps