Cosmology from one galaxy in a void?

Abstract

Understanding galaxy properties may be the key to unlocking some of the most intriguing mysteries of modern cosmology. Recent work relied on machine learning to extract cosmological constraints on ${\Omega }_{\mathrm{m}}$ using only one galaxy. But if this is true, how should we select the galaxy to use for cosmology inference? In this paper, we consider selecting a galaxy that lies in cosmic voids, the underdense regions of the cosmic web, and compare the constraints obtained with the ones obtained when randomly selecting a galaxy in the whole sample. We use the IllustrisTNG galaxy catalog from the CAMELS project and the VIDE void finder to identify galaxies inside voids. We show that void galaxies provide stronger constraints on ${\Omega }_{\mathrm{m}}$ compared to randomly selected galaxies. This result suggests that the distinctive characteristics of void galaxies may provide a cleaner and more effective environment for extracting cosmological information.

arXiv comment10 pages, 5 figures. Published on ApJL. Comments are welcome

References in corpus (56)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Detection of the Baryon Acoustic Peak in the Large-Scale Correlation Function of SDSS Luminous Red Galaxies
• The Supernova Legacy Survey: Measurement of Omega_M, Omega_Lambda and w from the First Year Data Set
• Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples
• First results from the IllustrisTNG simulations: matter and galaxy clustering
• Cosmological Results from High-z Supernovae
• First results from the IllustrisTNG simulations: A tale of two elements -- chemical evolution of magnesium and europium
• Cosmological Parameters from Observations of Galaxy Clusters
• Simba: Cosmological Simulations with Black Hole Growth and Feedback
• First results from the IllustrisTNG simulations: radio haloes and magnetic fields
• Chandra Cluster Cosmology Project III: Cosmological Parameter Constraints
• Cosmic Microwave Background Anisotropies
• The Arepo public code release
• ZOBOV: a parameter-free void-finding algorithm
• The CAMELS project: Cosmology and Astrophysics with MachinE Learning Simulations
• Precision cosmography with stacked voids
• The Aspen--Amsterdam Void Finder Comparison Project
• Type Ia Supernovae and the Hubble Constant
• Photometric Properties of Void Galaxies in the Sloan Digital Sky Survey
• Constraints on Cosmology and Gravity from the Dynamics of Voids
• Counting voids to probe dark energy
• The Luminosity Function of Void Galaxies in the Sloan Digital Sky Survey
• Spectroscopic Properties of Void Galaxies in the Sloan Digital Sky Survey
• Precision cosmology with voids: definition, methods, dynamics
• Probing cosmology and gravity with redshift-space distortions around voids
• Only the Lonely: H I Imaging of Void Galaxies
• Voids as a Precision Probe of Dark Energy
• An Imaging and Spectroscopic Survey of Galaxies Within Prominent Nearby Voids. I. The Sample and Luminosity Distribution
• The Void Size Function in Dynamical Dark Energy Cosmologies
• Precision cosmology with voids in the final BOSS data
• Void Ellipticity Distribution as a Probe of Cosmology
• The GIGANTES dataset: precision cosmology from voids in the machine learning era
• Multipole analysis of redshift-space distortions around cosmic voids
• Euclid: Forecasts from redshift-space distortions and the Alcock-Paczynski test with cosmic voids
• Study of galaxies in the Lynx-Cancer void. I. Sample description
• Euclid: Cosmological forecasts from the void size function
• Properties of simulated galaxies and supermassive black holes in cosmic voids
• Cosmological constraints from the BOSS DR12 void size function
• Cosmic voids: a novel probe to shed light on our Universe
• Cosmology with one galaxy?
• Revealing the properties of void galaxies and their assembly using the EAGLE simulation
• The metallicity of void dwarf galaxies
• Void Galaxies Follow a Distinct Evolutionary Path in the Environmental COntext Catalog
• Void galaxies in the nearby Universe. I. Sample description
• Updated void catalogs of the SDSS DR7 main sample
• Why Cosmic Voids Matter: Nonlinear Structure & Linear Dynamics
• Exploring the cosmological synergy between galaxy cluster and cosmic void number counts
• Galaxy And Mass Assembly (GAMA): The Bright Void Galaxy Population in the Optical and Mid-IR
• How to Build a Catalogue of Linearly-Evolving Cosmic Voids
• The Stellar Kinematics of Void Dwarf Galaxies Using KCWI
• Search for and study of extremely metal-deficient galaxies
• The Bridge Effect of Void Filaments
• Machine-learning cosmology from void properties

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• Cosmology with Persistent Homology: a Fisher Forecast
• Cosmological Inference with Cosmic Voids and Neural Network Emulators
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