activity
20242026
most citedRay-tracing vs. Born approximation in full-sky weak lensing simulations of the MillenniumTNG project

1 citations · 2 across the 9 of their papers we have counts for

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astro-ph.CO2025

Harmony of the Spheres: Extension to All Points of an Algorithm for Producing a Density Field with Given Two-, Three-, and Four-Point Correlation Functions

Zcahary Slepian, Alessandro Greco

Previous work (Slepian 2024) showed that the Smith-Zaldarriaga (2011) algorithm to realize Cosmic Microwave Background (CMB) maps with any desired harmonic-space bispectrum could b…

astro-ph.CO2025

Measurement of Parity-Violating Modes of the Dark Energy Spectroscopic Instrument (DESI) Year 1 Luminous Red Galaxies' 4-Point Correlation Function

Zachary Slepian, Alex Krolewski, Alessandro Greco +38

Here we report the first measurement of the parity-violating (PV) 4-Point Correlation Function (4PCF) of the Dark Energy Spectroscopic Instrument's Year 1 Luminous Red Galaxy (DESI…

astro-ph.CO2025

Power Spectrum, Bispectrum, 2- and 3-Point Correlation Function, and Beyond

Zachary Slepian, Farshad Kamalinejad, Alessandro Greco

N-Point Correlation Functions, usually with N = 2, 3, and their Fourier-space analogs power spectrum and bispectrum, are major tools used in cosmology to capture the clustering of…

astro-ph.CO2025

CMB Lensing Trispectrum as a Probe of Parity Violation in LSS

Alessandro Greco, Zachary Slepian, Jiamin Hou +1

We show that the Cosmic Microwave Background (CMB) lensing trispectrum is sensitive to parity violation in Large-Scale Structure (LSS). We obtain a compact expression for the reduc…

astro-ph.CO2025

Analytic Model for Covariance Matrices of the 2-, 3-, and 4-Point Correlation Functions in the Gaussian Random Field Approximation

Jessica Chellino, Alessandro Greco, Simon May +1

Analyses of the galaxy N-Point Correlation Functions (NPCFs) have a large number of degrees of freedom, meaning one cannot directly estimate an invertible covariance matrix purely…