Results 81 to 90 of about 170,764 (173)

Cosmology with One Galaxy: Autoencoding the Galaxy Properties Manifold

The Astrophysical Journal
Cosmological simulations like CAMELS and IllustrisTNG characterize hundreds of thousands of galaxies using various internal properties. Previous studies have demonstrated that machine learning can be used to infer the cosmological parameter Ω _m from the
Amanda Lue, Shy Genel, Marc Huertas-Company, Francisco Villaescusa-Navarro, Matthew Ho   +4 more
doaj   +1 more source

Sound-horizon-agnostic Inference of the Hubble Constant and Neutrino Masses from Baryon Acoustic Oscillations, Cosmic Microwave Background Lensing, and Galaxy Weak Lensing and Clustering

The Astrophysical Journal Letters
We present a sound-horizon-agnostic determination of the Hubble constant, H _0 , by combining DESI Data Release 2 baryon acoustic oscillations (BAO) data with the latest cosmic microwave background (CMB) lensing measurements from Planck, the Atacama ...
Helena García Escudero, Seyed Hamidreza Mirpoorian, Levon Pogosian   +2 more
doaj   +1 more source

Cosmological applications in Kaluza-Klein theory

, 2012
The field equations of Kaluza-Klein (KK) theory have been applied in the domain of cosmology. These equations are solved for a flat universe by taking the gravitational and the cosmological constants as a function of time t.
A.A. Nowaya, Biesiada M, Carroll S M, Dolgov A D, Dolgov A D, Gamal G. L. Nashed, Godlowski W, Godlowski W, Kaluza T, Linde A D, M.I. Wanas, Perlmutter S, Polyakov A M, Puetzfeld D, Reiess A G, Reiess A G, Sahni V, Sen S, Wanas M I, Zhu Z H   +19 more
core   +1 more source

Refitting Cosmological Data with Neutrino Mass and Degeneracy

The Astrophysical Journal Letters
A simple and natural extension of the standard Lambda cold dark matter (ΛCDM) model is to allow relic neutrinos to have finite chemical potentials. We confront this ΛCDM ξ model, a ΛCDM with neutrino mass M _ν and degeneracy ξ _3 as additional parameters,
Shek Yeung, Wangzheng Zhang, Ming-chung Chu   +2 more
doaj   +1 more source

Cosmological parameters from weak cosmological lensing

, 2018
In this manuscript of the habilitation diriger des recherches (HDR), the author presents some of his work over the last ten years. The main topic of this thesis is cosmic shear, the distortion of images of distant galaxies due to weak gravitational lensing by the large-scale structure in the Universe.
openaire   +2 more sources

Participatory Science and Machine Learning Applied to Millions of Sources in the Hobby–Eberly Telescope Dark Energy Experiment

The Astrophysical Journal
We are merging a large participatory science effort with machine learning to enhance the Hobby–Eberly Telescope Dark Energy Experiment (HETDEX). Our overall goal is to remove false positives, allowing us to use lower signal-to-noise data and sources with
Lindsay R. House, Karl Gebhardt, Keely Finkelstein, Erin Mentuch Cooper, Dustin Davis, Daniel J. Farrow, Donald P. Schneider   +6 more
doaj   +1 more source

The Cosmological Parameters 2014

The Review of Particle Physics 2014, 2014
21 pages TeX file. Article for The Review of Particle Physics 2014 (aka the Particle Data Book), on-line version at http://pdg.lbl.gov/2013/reviews/contents_sports.html .
Lahav, Ofer, Liddle, Andrew R, Lahav, Ofer; Liddle, Andrew R   +4 more
openaire   +3 more sources

Quantum estimation of cosmological parameters

Journal of High Energy Physics
Understanding how well future cosmological experiments can reconstruct the mechanism that generated primordial inhomogeneities is key to assessing the extent to which cosmology can inform fundamental physics.
Michał Piotrak, Thomas Colas, Ana Alonso-Serrano, Alessio Serafini   +3 more
doaj   +1 more source

Efficient sampling of fast and slow cosmological parameters

, 2013
Physical parameters are often constrained from the data likelihoods using sampling methods. Changing some parameters can be much more computationally expensive (`slow') than changing other parameters (`fast parameters').
Lewis, Antony
core   +1 more source

Cosmological Parameters 2000

, 2000
The cosmological parameters that I emphasize are the age of the universe $t_0$, the Hubble parameter $H_0 \equiv 100 h$ km s$^{-1}$ Mpc$^{-1}$, the average matter density $ _m$, the baryonic matter density $ _b$, the neutrino density $ _ $, and the cosmological constant $ _ $. The evidence currently favors $t_0 \approx 13$ Gyr, $h \approx 0.65$, $
openaire   +2 more sources