Search Results for author:
Found 15 papers, 11 papers with code
Computing the Small-Scale Galaxy Power Spectrum and Bispectrum in Configuration-Space
We present a new class of estimators for computing small-scale power spectra and bispectra in configuration-space via weighted pair- and triple-counts, with no explicit use of Fourier transforms.
Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics
Estimating Covariance Matrices for Two- and Three-Point Correlation Function Moments in Arbitrary Survey Geometries
These are derived in the Gaussian limit (setting higher-order correlation functions to zero), but for arbitrary non-linear 2PCFs (which may be estimated from the survey itself), with a shot-noise rescaling parameter included to capture non-Gaussianity.
Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics
A Hybrid Deep Learning Approach to Cosmological Constraints From Galaxy Redshift Surveys
We present a deep machine learning (ML)-based technique for accurately determining $\sigma_8$ and $\Omega_m$ from mock 3D galaxy surveys.
Cosmology and Nongalactic Astrophysics
RascalC: A Jackknife Approach to Estimating Single and Multi-Tracer Galaxy Covariance Matrices
Deviations between large scale model covariances from a mock survey and those from a large suite of mocks are found to be be indistinguishable from noise.
Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics
Exploring the squeezed three-point galaxy correlation function with generalized halo occupation distribution models
We identify generalized HOD prescriptions that are nearly degenerate in the projected 2PCF and demonstrate that these degeneracies are broken in the redshift-space anisotropic 2PCF and the squeezed 3PCF.
Cosmology and Nongalactic Astrophysics
The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample
When combined with supernova Ia data, we find H0 = 67. 3+/-1. 0 km/s/Mpc even for our most general dark energy model, in tension with some direct measurements.
Cosmology and Nongalactic Astrophysics
The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: tomographic BAO analysis of DR12 combined sample in configuration space
Splitting the sample into multiple overlapping redshift slices to extract the redshift information of galaxy clustering, we obtain a measurement of $D_A(z)/r_d$ and $H(z)r_d$ at nine effective redshifts with the full covariance matrix calibrated using MultiDark-Patchy mock catalogues.
Cosmology and Nongalactic Astrophysics
SDSS-III Baryon Oscillation Spectroscopic Survey Data Release 12: galaxy target selection and large scale structure catalogues
We also present the algorithms used to create large scale structure catalogues for the final Data Release (DR12) samples and the associated random catalogues that quantify the survey mask.
Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies
Computing the Three-Point Correlation Function of Galaxies in $\mathcal{O}(N^2)$ Time
We present an algorithm that computes the multipole coefficients of the galaxy three-point correlation function (3PCF) without explicitly considering triplets of galaxies.
Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics
The Clustering of Galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Measuring H(z) and D_A(z) at z = 0.57 with Clustering Wedges
The baryonic acoustic feature is used to obtain model independent constraints cz/H/r_s = 12. 28 +- 0. 82 (6. 7 per-cent accuracy) and D_A/r_s = 9. 05 +- 0. 27 (3. 0 per-cent) with a correlation coefficient of -0. 5, where r_s is the sound horizon scale at the end of the baryonic drag era.
Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology
On the Robustness of the Acoustic Scale in the Low-Redshift Clustering of Matter
We discuss the effects of non-linear structure formation on the signature of acoustic oscillations in the late-time galaxy distribution.
Improving Cosmological Distance Measurements by Reconstruction of the Baryon Acoustic Peak
The baryon acoustic oscillations are a promising route to the precision measure of the cosmological distance scale and hence the measurement of the time evolution of dark energy.
The White Dwarf Luminosity Function from SDSS Imaging Data
A sample of white dwarfs is selected from SDSS DR3 imaging data using their reduced proper motions, based on improved proper motions from SDSS plus USNO-B combined data.
Power Spectra for Cold Dark Matter and its Variants
The bulk of recent cosmological research has focused on the adiabatic cold dark matter model and its simple extensions.
astro-ph
Baryonic Features in the Matter Transfer Function
We provide scaling relations and fitting formulae for adiabatic cold dark matter cosmologies that account for all baryon effects in the matter transfer function to better than 10% in the large-scale structure regime.
