Results 101 to 110 of about 6,292 (199)

Measurements of the Hubble Constant: Tensions in Perspective*

The Astrophysical Journal, 2021
Abstract Measurement of the distances to nearby galaxies has improved rapidly in recent decades. The ever-present challenge is to reduce systematic effects, especially as greater distances are probed and the uncertainties become larger. In this paper, we combine several recent calibrations of the tip of the red giant branch (TRGB) method.
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The Pursuit of the Hubble Constant Using Type II Supernovae

Part of the book series: Springer Series in Astrophysics and CosmologyThe use of multiple independent methods with their own systematic uncertainties is crucial for resolving the ongoing tension between local and distant measurements of the Hubble ...
Jaeger, T. de, Galbany, Lluís
core   +1 more source

Blinded Mock Data Challenge for Gravitational-wave Cosmology. I. Assessing the Robustness of Methods Using Binary Black Hole Mass Spectrum

The Astrophysical Journal
Gravitational wave sources are standard sirens that provide an independent way to map the cosmic expansion history by combining with an independent redshift measurement, either from an electromagnetic counterpart for a bright siren or using different ...
Aman Agarwal, Ulyana Dupletsa, Konstantin Leyde, Suvodip Mukherjee, Benot Revenu, Juan Esteban Rivera, Antonio Enea Romano, Mohit Raj Sah, Sergio Vallejo-Peña, Adrian Avendano, Freija Beirnaert, Gergely Dalya, Miguel Cifuentes Espitia, Christos Karathanasis, Santiago Moreno- Gonzalez, Lucas Quiceno, Federico Stachurski, Juan Garcia-Bellido, Rachel Gray, Nicola Tamanini, Cezary Turski   +20 more
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Hubble Constant and Strong Gravitational Lensing [PDF]

The persistent tension between early and late universe measurements of the Hubble constant (H0) represents one of the most significant challenges in modern cosmology, with implications for our understanding of fundamental physics.
Schmidt, Thomas
core  

Refined Constraints on the Hubble Constant from Localized Fast Radio Bursts with Assessment of Systematic Effects

The Astrophysical Journal
The dispersion measure–redshift relation of fast radio bursts (FRBs) provides a valuable cosmological probe for constraining the Hubble constant, offering an independent measurement that could help resolve the ongoing Hubble tension.
Chenyuan Xu, Yi Feng, Jiaying Xu
doaj   +1 more source

On the cosmological and Hubble constants

, 2019
The values of the cosmological constant, $\Lambda$, and the Hubble constant, $H_0$, are determined using the vacuum energy density, $-\Delta e$, equal to $-1.016124 \times 10^{113} J m^{-3}$ and the age of the universe, $t_0$, equal to $1.380 \times 10^{10}~years$.
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Golden and Silver Dark Sirens for Precise H0 Measurement with HETDEX

The Astrophysical Journal
Gravitational waves (GWs) from compact binary coalescences are standard sirens that provide a direct measure of the source’s luminosity distance, enabling an independent measurement of the Hubble constant ( H _0 ).
Yixuan Dang, Ish Gupta, Robin Ciardullo, Erin Mentuch Cooper, Shiksha Pandey, Dustin Davis, Surhud More, Rachel Gray, Hsin-Yu Chen, Daniel J. Farrow, Caryl Gronwall, Donghui Jeong, Shun Saito, Donald P. Schneider, B. S. Sathyaprakash   +14 more
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On the Hubble constant and the cosmological constant [PDF]

Monthly Notices of the Royal Astronomical Society, 1997
F. Hoyle, G. Burbidge, J. V. Narlikar
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Estimating the Hubble constant on a base of observed values of the Hubble parameter H(z) in a model without expansion [PDF]

, 2014
In the model of low-energy quantum gravity by the author, the ratio H(z)/(1 + z) should be equal to the Hubble constant. Here, the weighted average value of the Hubble constant has been found using 29 observed values of the Hubble parameter H(z): ±σ0
Ivanov, M. A.
core  

The shrinking Hubble constant

, 2006
This replacement corrects the method of separating components of red ...
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