338 citations · 1.7k across the 35 of their papers we have counts for
16 papers · 1 filter
A low value of in tension with the distance ladder from Megamasers using peculiar velocity reconstruction
Richard Watkins, Hume A. Feldman
Megamaser distances can be measured without using the traditional distance ladder. As such, they provide an independent probe of the local expansion rate, quantified by the Hubble…
Analyzing the Large-Scale Bulk Flow using CosmicFlows4: Increasing Tension with the Standard Cosmological Model
Richard Watkins, Trey Allen, Collin James Bradford +7
We present an estimate of the bulk flow in a volume of radii Mpc using the minimum variance (MV) method with data from the CosmicFlows-4 (CF4) catalog. The addition…
Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
Elcio Abdalla, Guillermo Franco Abellán, Amin Aboubrahim +200
In this paper we will list a few important goals that need to be addressed in the next decade, also taking into account the current discordances between the different cosmological…
Improved Methods for Estimating Peculiar Velocity Correlation Functions Using Volume Weighting
Yuyu Wang, Sarah Peery, Hume A. Feldman +1
We present an improved method for calculating the parallel and perpendicular velocity correlation functions directly from peculiar velocity surveys using weighted maximum-likelihoo…
Peculiar Velocity Estimation from Kinetic SZ Effect using Deep Neural Networks
Yuyu Wang, Nesar Ramachandra, Edgar M. Salazar-Canizales +3
The Sunyaev-Zel'dolvich (SZ) effect is expected to be instrumental in measuring velocities of distant clusters in near future telescope surveys. We simplify the calculation of pecu…
Easily Interpretable Bulk Flows: Continuing Tension with the Standard Cosmological Model
Sarah Peery, Richard Watkins, Hume A. Feldman
We present an improved Minimal Variance (MV) method for using a radial peculiar velocity sample to estimate the average of the three-dimensional velocity field over a spherical vol…
The Peculiar Velocity Correlation Function
Yuyu Wang, Christopher Rooney, Hume A. Feldman +1
We present an analysis of the two-point peculiar velocity correlation function using data from the CosmicFlows catalogues. The Millennium and MultiDark Planck 2 N-body simulations…
Gravitational potential wells and the cosmic bulk flow
Abhinav Kumar, Yuyu Wang, Hume A. Feldman +1
The bulk flow is a volume average of the peculiar velocities and a useful probe of the mass distribution on large scales. The gravitational instability model views the bulk flow as…
An Unbiased Estimator of Peculiar Velocity with Gaussian Distributed Errors for Precision Cosmology
Richard Watkins, Hume A. Feldman
We introduce a new estimator of the peculiar velocity of a galaxy or group of galaxies from redshift and distance estimates. This estimator results in peculiar velocity estimates w…
Large-scale Cosmic Flows from Cosmicflows-2 Catalog
Richard Watkins, Hume A. Feldman
The Cosmicflows-2 catalogue is a compendium of peculiar velocity measurements. While it has many objects in common with the COMPOSITE catalogue, a previously analysed collection of…
Hubble flow variance and the cosmic rest frame
David L. Wiltshire, Peter R. Smale, Teppo Mattsson +1
We characterize the radial and angular variance of the Hubble flow in the COMPOSITE sample of 4534 galaxies, on scales in which much of the flow is in the nonlinear regime. With no…
Testing the minimum variance method for estimating large-scale velocity moments
Shankar Agarwal, Hume A. Feldman, Richard Watkins
The estimation and analysis of large-scale bulk flow moments of peculiar velocity surveys is complicated by non-spherical survey geometry, the non-uniform sampling of the matter ve…
Cosmic flows in the nearby universe from Type Ia Supernovae
Stephen J. Turnbull, Michael J. Hudson, Hume A. Feldman +3
Peculiar velocities are one of the only probes of very large-scale mass density fluctuations in the nearby Universe. We present new "minimal variance" bulk flow measurements based…
Power Spectrum Estimation from Peculiar Velocity Catalogues
Edward Macaulay, Hume A. Feldman, Pedro G. Ferreira +4
The peculiar velocities of galaxies are an inherently valuable cosmological probe, providing an unbiased estimate of the distribution of matter on scales much larger than the depth…
A Slight Excess of Large Scale Power from Moments of the Peculiar Velocity Field
Edward Macaulay, Hume A. Feldman, Pedro G. Ferreira +2
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 indica…
Cosmic Flows on 100 Mpc/h Scales: Standardized Minimum Variance Bulk Flow, Shear and Octupole Moments
Hume A. Feldman, Richard Watkins, Michael J. Hudson
The low order moments, such as the bulk flow and shear, of the large scale peculiar velocity field are sensitive probes of the matter density fluctuations on very large scales. In…