1k citations · 1.3k across the 16 of their papers we have counts for
16 papers
Learning the Cosmic Web: Graph-based Classification of Simulated Galaxies by their Dark Matter Environments
Dakshesh Kololgi, Krishna Naidoo, Amelie Saintonge +1
We present a novel graph-based machine learning classifier for identifying the dark matter cosmic web environments of galaxies. Large galaxy surveys offer comprehensive statistical…
How massive neutrinos reshape the cosmic web
Leonor N. L. Simões, Krishna Naidoo, Benjamin Joachimi +2
We explore the effects of massive neutrinos on the cosmic web using the FLAMINGO simulations. We classify the cosmic web into voids, sheets, filaments, and clusters, and find that…
Methods for robustly measuring the minimum spanning tree and other field level statistics from galaxy surveys
Krishna Naidoo, Ofer Lahav
Field level statistics, such as the minimum spanning tree (MST), have been shown to be a promising tool for parameter inference in cosmology. However, applications to real galaxy s…
Signs of a non-zero equation-of-state for Dark Matter
Krishna Naidoo
We demonstrate how a changing and negative equation-of-state (EoS) for dark matter can alleviate cosmic tensions and explain the integrated Sachs-Wolfe (ISW) void anomaly. We discu…
Constrained simulations of the local Universe with Modified Gravity
Krishna Naidoo, Wojciech A. Hellwing, Maciej Bilicki +3
We present a methodology for constructing modified gravity (MG) constrained simulations of the local Universe using positions and peculiar velocities from the CosmicFlows data set.…
Dark matter solution to the and tensions, and the integrated Sachs-Wolfe void anomaly
Krishna Naidoo, Mariana Jaber, Wojciech A. Hellwing +1
We consider a phenomenological model of dark matter with an equation-of-state that is negative and changing at late times. We show this couples the and tensions…
Euclid: Calibrating photometric redshifts with spectroscopic cross-correlations
K. Naidoo, H. Johnston, B. Joachimi +126
Cosmological constraints from key probes of the Euclid imaging survey rely critically on the accurate determination of the true redshift distributions, , of tomographic redsh…
COWS: A filament finder for Hessian cosmic web identifiers
Simon Pfeifer, Noam I. Libeskind, Yehuda Hoffman +3
The large scale galaxy and matter distribution is often described by means of the cosmic web made up of voids, sheets, filaments and knots. Many different recipes exist for identif…
Cosmology and neutrino mass with the Minimum Spanning Tree
Krishna Naidoo, Elena Massara, Ofer Lahav
The information content of the minimum spanning tree (MST), used to capture higher-order statistics and information from the cosmic web, is compared to that of the power spectrum f…
Full sky Integrated Sachs-Wolfe maps for the MICE Grand Challenge lightcone simulation
Krishna Naidoo, Pablo Fosalba, Lorne Whiteway +1
We present full-sky maps of the Integrated Sachs-Wolfe effect (ISW) for the MICE Grand Challenge lightcone simulation up to redshift 1.4. The maps are constructed in the linear reg…
MiSTree: a Python package for constructing and analysing Minimum Spanning Trees
Krishna Naidoo
The minimum spanning tree (MST), a graph constructed from a distribution of points, draws lines between pairs of points so that all points are linked in a single skeletal structure…
Beyond two-point statistics: using the minimum spanning tree as a tool for cosmology
Krishna Naidoo, Lorne Whiteway, Elena Massara +5
Cosmological studies of large-scale structure have relied on two-point statistics, not fully exploiting the rich structure of the cosmic web. In this paper we show how to capture s…
The cosmic microwave background Cold Spot anomaly: the impact of sky masking and the expected contribution from the Integrated Sachs-Wolfe effect
Krishna Naidoo, Aurélien Benoit-Lévy, Ofer Lahav
We re-analyse the cosmic microwave background (CMB) Cold Spot (CS) anomaly with particular focus on understanding the bias a mask (contaminated by Galactic and point sources) may i…
Imprint of DES super-structures on the Cosmic Microwave Background
A. Kovács, C. Sánchez, J. García-Bellido +58
Small temperature anisotropies in the Cosmic Microwave Background can be sourced by density perturbations via the late-time integrated Sachs-Wolfe effect. Large voids and superclus…
The Dark Energy Survey: more than dark energy - an overview
Dark Energy Survey Collaboration, T. Abbott, F. B. Abdalla +138
This overview article describes the legacy prospect and discovery potential of the Dark Energy Survey (DES) beyond cosmological studies, illustrating it with examples from the DES…
Could multiple voids explain the Cosmic Microwave Background Cold Spot anomaly?
Krishna Naidoo, Aurélien Benoit-Lévy, Ofer Lahav
Understanding the observed Cold Spot (CS) (temperature of ~ -150 mu K at its centre) on the Cosmic Microwave Background (CMB) is an outstanding problem. Explanations vary from assu…