Clipping the Cosmos II: Cosmological information from non-linear scales
arXiv:1306.6349 · doi:10.1103/PhysRevD.88.083510
Abstract
We present a method for suppressing contributions from higher-order terms in perturbation theory, greatly increasing the amount of information which may be extracted from the matter power spectrum. In an evolved cosmological density field the highest density regions are responsible for the bulk of the nonlinear power. By suitably down-weighting these problematic regions we find that the one- and two-loop terms are typically reduced in amplitude by ~70 per cent and ~95 per cent respectively, relative to the linear power spectrum. This greatly facilitates modelling the shape of the galaxy power spectrum, potentially increasing the number of useful Fourier modes by more than two orders of magnitude. We provide a demonstration of how this technique allows the galaxy bias and the amplitude of linear matter perturbations sigma_8 to be determined from the power spectrum on conventionally nonlinear scales, 0.1<k<0.7 h/Mpc.
13 pages, 11 figures. To appear in Physical Review D
References in corpus (4)
- Improving Cosmological Distance Measurements by Reconstruction of the Baryon Acoustic Peak
- RegPT: Direct and fast calculation of regularized cosmological power spectrum at two-loop order
- Perturbation Theory Reloaded II: Non-linear Bias, Baryon Acoustic Oscillations and Millennium Simulation In Real Space
- Information escaping the correlation hierarchy of the convergence field in the study of cosmological parameters
Cited by in corpus (25)
- Accurate halo-model matter power spectra with dark energy, massive neutrinos and modified gravitational forces
- Modeling baryonic physics in future weak lensing surveys
- Density split statistics: joint model of counts and lensing in cells
- The Novel Probes Project -- Tests of Gravity on Astrophysical Scales
- A hydrodynamical halo model for weak-lensing cross correlations
- Testing the theory of gravity with DESI: estimators, predictions and simulation requirements
- Primordial non-Gaussianity without tails -- how to measure fNL with the bulk of the density PDF
- Galaxy and Mass Assembly (GAMA): Redshift Space Distortions from the Clipped Galaxy Field
- Learning cosmology and clustering with cosmic graphs
- Dark Energy Survey Year 1 Results: Constraining Baryonic Physics in the Universe
- Unscreening Modified Gravity in the Matter Power Spectrum
- Beyond delta: Tailoring marked statistics to reveal modified gravity
- KiDS-450: Enhancing cosmic shear with clipping transformations
- Divergence of Perturbation Theory in Large Scale Structures
- On the total cosmological information in galaxy clustering: an analytical approach
- Quantification of high dimensional non-Gaussianities and its implication to Fisher analysis in cosmology
- Reconstruction of halo power spectrum from redshift-space galaxy distribution: cylinder-grouping method and halo exclusion effect
- Probing scalar tensor theories for gravity in redshift space
- The Information Content of Projected Galaxy Fields
- High-precision Monte-Carlo modelling of galaxy distribution
- Enhancing the Cosmic Shear Power Spectrum
- Towards an optimal marked correlation function analysis for the detection of modified gravity
- Pair Counting without Binning -- A New Approach to Correlation Functions in Clustering Statistics
- Largest scales from the largest galaxy surveys: the pseudo Karhunen-Loève method
- Indicator Functions: Distilling the Information from Gaussian Random Fields