1.9k citations · 24.6k across the 271 of their papers we have counts for
11 papers · 2 filters
A Moving Frame Algorithm for High Mach Number Hydrodynamics
Hy Trac, Ue-Li Pen
We present a new approach to Eulerian computational fluid dynamics that is designed to work at high Mach numbers encountered in astrophysical hydrodynamic simulations. The Eulerian…
High Performance Commodity Networking in a 512-CPU Teraflop Beowulf Cluster for Computational Astrophysics
John Dubinski, Robin Humble, Ue-Li Pen +2
We describe a new 512-CPU Beowulf cluster with Teraflop performance dedicated to problems in computational astrophysics. The cluster incorporates a cubic network topology based on…
A Free, Fast, Simple and Efficient TVD MHD Code
Ue-Li Pen, Phil Arras, ShingKwong Wong
We describe a numerical method to solve the magnetohydrodynamic (MHD) equations. The fluid variables are updated along each direction using the flux conservative, 2nd order, total…
Fast n-point correlation functions and three-point lensing application
Lucy Liuxuan Zhang, Ue-Li Pen
We present a new algorithm to rapidly compute the two-point (2PCF), three-point (3PCF) and n-point (n-PCF) correlation functions in roughly O(N log N) time for N particles, instead…
Gravitational Lensing of Epoch-of-reionization Gas
Ue-Li Pen
I present a weak lensing sensitivity estimate for upcoming high redshift (epoch of reionization and beyond) 21cm surveys. Instruments such as PAST, LOFAR and SKA should be able to…
Fast Power Spectrum Estimation
Ue-Li Pen
We present a new algorithm to rapidly and optimally compute power spectra. This new algorithm is based on a generalization of iterative multigrid, and has computational cost O(N lo…
Optimal Weak Lensing Skewness Measurements
Tong-Jie Zhang, Ue-Li Pen, Pengjie Zhang +1
Weak lensing measurements are entering a precision era to statistically map the distribution of matter in the universe. The most common measurement has been of the variance of the…
Precision era of the kinetic Sunyaev-Zeldovich effect: simulations, analytical models and observations and the power to constrain reionization
Pengjie Zhang, Ue-Li Pen, Hy Trac
The kinetic SZ effect, which is the dominant CMB source at arc-minute scales and Ghz, probes the ionized gas peculiar momentum up to the epoch of reionization and is a…
The three dimensional power spectrum of dark and luminous matter from the VIRMOS-DESCART cosmic shear survey
Ue-Li Pen, Tingting Lu, Ludovic van Waerbeke +1
We present the first optimal power spectrum estimation and three dimensional deprojections for the dark and luminous matter and their cross correlations. The results are obtained u…
The Fate of Non-Radiative Magnetized Accretion Flows: Magnetically-Frustrated Convection
Ue-Li Pen, Christopher D. Matzner, Shingkwong Wong
We present a scenario for non-radiative accretion onto the supermassive black hole at the galactic center. Conducting MHD simulations with 1400^3 grid zones that break the axial an…
Detection of dark matter Skewness in the VIRMOS-DESCART survey: Implications for Ω_0
Ue-Li Pen, Tongjie Zhang, Ludovic van Waerbeke +3
Weak gravitational lensing provides a direct statistical measure of the dark matter distribution. The variance is easiest to measure, which constrains the degenerate product σ_8Ω^0…