Reconstruction analysis of galaxy redshift surveys: a hybrid reconstruction method
TLDR
In this paper, a hybrid reconstruction method combining the Gaussianization technique of Weinberg with dynamical schemes of Nusser & Dekel and Gramann is presented. But the method is limited to the case of the point source catalog and the optical redshift survey.Abstract:
In reconstruction analysis of a galaxy redshift survey, one works backward from the observed galaxy distribution to the primordial density field in the same region of space, then evolves the primordial fluctuations forward in time with an N-body code. A reconstruction incorporates assumptions about the values of cosmological parameters, the properties of primordial fluctuations, and the "biasing" relation between galaxies and mass. These assumptions can be tested by comparing the reconstructed galaxy distribution to the observed distribution, and to peculiar velocity data when available. This paper presents a hybrid reconstruction method that combines the "Gaussianization" technique of Weinberg with the dynamical schemes of Nusser & Dekel and Gramann. We test the method on N-body simulations and on N-body mock catalogs designed to mimic the depth and geometry of the Point Source Catalog Redshift Survey and the Optical Redshift Survey. The hybrid method is more accurate than Gaussianization or dynamical reconstruction alone. Matching the observed morphology of clustering can set limits on the bias factor b independently of Ω. Matching cluster velocity dispersions and the redshift-space distortions of the correlation function ξ(s, μ) constrains the parameter combination β ≈ Ω0.6/b. Relative to linear or quasi-linear approximations, a fully nonlinear reconstruction makes more accurate predictions of ξ(s, μ) for a given β, reducing the systematic biases of β measurements and offering further possibilities for breaking the degeneracy between Ω and b. Reconstruction also circumvents the cosmic variance noise that limits conventional analyses of ξ(s, μ), since the orientations of large, coherent structures in the observed galaxy distribution are reproduced in the reconstruction. Finally, reconstruction can improve the determination of Ω and b from joint analyses of redshift and peculiar velocity surveys because it provides a fully nonlinear prediction of the peculiar velocity distribution at each point in redshift space.read more
Citations
More filters
Journal ArticleDOI
Observational probes of cosmic acceleration
David H. Weinberg,Michael J. Mortonson,Daniel J. Eisenstein,Daniel J. Eisenstein,Christopher M. Hirata,Adam G. Riess,Eduardo Rozo +6 more
TL;DR: In this article, the authors present extensive forecasts for constraints on the dark energy equation of state and parameterized deviations from General Relativity, achievable with Stage III and Stage IV experimental programs that incorporate supernovae, BAO, weak lensing, and cosmic microwave background data.
Journal ArticleDOI
Stochastic Nonlinear Galaxy Biasing
Avishai Dekel,Ofer Lahav +1 more
TL;DR: In this paper, a general formalism for galaxy biasing is proposed and applied to methods for measuring cosmological parameters, such as regression of light versus mass, the analysis of redshift distortions, measures involving skewness, and the cosmic virial theorem.
Journal ArticleDOI
Reconstruction of the early Universe as a convex optimization problem
Yann Brenier,Uriel Frisch,Uriel Frisch,Michel Hénon,Grégoire Loeper,Sabino Matarrese,Roya Mohayaee,A. Sobolevskiĭ +7 more
TL;DR: In this article, it was shown that the deterministic past history of the universe can be uniquely reconstructed from knowledge of the present mass density field, the latter being inferred from the three-dimensional distribution of luminous matter, assumed to be tracing the distribution of dark matter up to a known bias.
Journal ArticleDOI
Information field theory for cosmological perturbation reconstruction and nonlinear signal analysis
TL;DR: It is shown that a Gaussian signal, which should resemble the initial density perturbations of the Universe, observed with a strongly nonlinear, incomplete and Poissonian-noise affected response, can be reconstructed thanks to the virtue of a response-renormalization flow equation.
Journal ArticleDOI
On the least action principle in cosmology
Adi Nusser,Enzo Branchini +1 more
TL;DR: In this article, a fast method for recovering past orbits using the least action principle is developed and tested. But it is not suitable for the case of large numbers of moving objects, and it cannot be used to estimate the velocity of all the moving objects.
References
More filters
The large-scale structure of the universe
TL;DR: Peebles as discussed by the authors argues that the evolution of the early universe went from a nearly uniform initial state to a progressively more irregular and clumpy universe, based on the largest known structures of the universe.
Journal ArticleDOI
The evolution of large-scale structure in a universe dominated by cold dark matter
TL;DR: In this article, the results of numerical simulations of nonlinear gravitational clustering in universes dominated by weakly interacting, cold dark matter are presented and the evolution of the fundamental statistical properties of the models is described and their comparability with observation is discussed.
Journal ArticleDOI
Dynamics of phase transition in the new inflationary universe scenario and generation of perturbations
TL;DR: In this article, the dynamics of non-equilibrium phase transition in the early universe are investigated and the transition is triggered by vacuum fluctuations of a Higgs scalar field which determine the duration of an intermediate inflationary stage and the amplitude of adiabatic perturbations.