Results 31 to 40 of about 1,546,467 (200)

Cepheid parallaxes and the Hubble constant [PDF]

open access: yesMonthly Notices of the Royal Astronomical Society, 2007
Revised Hipparcos parallaxes for classical Cepheids are analysed together with 10 HST-based parallaxes (Benedict et al.). In a reddening-free V,I relation we find that the coefficient of logP is the same within the uncertainties in our Galaxy as in the LMC, contrary to some previous suggestions.
van Leeuwen, Floor   +3 more
openaire   +2 more sources

Why reducing the cosmic sound horizon alone can not fully resolve the Hubble tension

open access: yesCommunications Physics, 2021
It is generally accepted that the Universe is dominated by dark energy but the different methods to measure the Hubble constant disagree, giving origin to what is known as the "Hubble tension”. The authors demonstrate that the sole reduction of the sound
Karsten Jedamzik   +2 more
doaj   +1 more source

Is the Hubble Constant Scale-Dependent? [PDF]

open access: yesGravitation and Cosmology, 2018
REVTeX4, 4 pages, accepted for publication in "Gravitation and Cosmology" (Springer), to appear in vol.24, no.2 (2018)
openaire   +2 more sources

THE 1% CONCORDANCE HUBBLE CONSTANT [PDF]

open access: yesThe Astrophysical Journal, 2014
9 pages, 4 figures, v2 reformatted in emulateapj, updated to match accepted ...
Bennett, C. L.   +3 more
openaire   +2 more sources

Hubble Tension: The Evidence of New Physics

open access: yesUniverse, 2023
The ΛCDM model provides a good fit to most astronomical observations but harbors large areas of phenomenology and ignorance. With the improvements in the precision and number of observations, discrepancies between key cosmological parameters of this ...
Jian-Ping Hu, Fa-Yin Wang
doaj   +1 more source

A bias using the ages of the oldest astrophysical objects to address the Hubble tension

open access: yesEuropean Physical Journal C: Particles and Fields, 2023
Recently different cosmological measurements have shown a tension in the value of the Hubble constant, $$H_0.$$ H 0 . Assuming the $$\Lambda $$ Λ CDM model, the Planck satellite mission has inferred the Hubble constant from the cosmic microwave ...
André A. Costa, Zelin Ren, Zhixiang Yin
doaj   +1 more source

Price of shifting the Hubble constant [PDF]

open access: yesPhysical Review D, 2018
33 pages, 25 PDF ...
Evslin, Jarah, Sen, Anjan A, Ruchika
openaire   +2 more sources

The Hubble Constant [PDF]

open access: yes, 2020
Considerable progress has been made in determining the Hubble constant over the past two decades. We discuss the cosmological context and importance of an accurate measurement of the Hubble constant, focusing on six high-precision distance-determination ...
Wendy L Freedman, Barry F Madore
core  

A Gravitational-wave Measurement of the Hubble Constant Following the Second Observing Run of Advanced LIGO and Virgo

open access: yesThe Astrophysical Journal, 2021
This paper presents the gravitational-wave measurement of the Hubble constant ( H _0 ) using the detections from the first and second observing runs of the Advanced LIGO and Virgo detector network.
B. P. Abbott   +1189 more
doaj   +1 more source

Hubble-constant crisis

open access: yesActa Physica Sinica, 2023
The Hubble constant quantitatively characterizes the expansion rate of the current Universe, and its precise measurement has become a crucial scientific problem. In recent years, there has been an increasingly serious discrepancy between the local direct measurements of the Hubble constant and the global fitting results, where the local direct ...
Rong-Gen CAI, Li LI, Shao-Jiang WANG
openaire   +1 more source

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