Results 21 to 30 of about 1,546,467 (200)
Evidence of a decreasing trend for the Hubble constant [PDF]
, 2023 The current discrepancy between the Hubble constant $H_0$ derived from the local distance ladder and from the cosmic microwave background is one of the most crucial issues in cosmology, as it possibly indicates unknown systematics or new physics. Here we
J.P. Hu +5 more
core +2 more sources
The impact of dust on Cepheid and Type Ia supernova distances [PDF]
, 2023 Milky-Way and intergalactic dust extinction and reddening must be accounted for in measurements of distances throughout the universe. This work provides a comprehensive review of the various impacts of cosmic dust focusing specifically on its effects on ...
Brout, Dillon, Riess, Adam
core +1 more source
Easing the Hubble constant tension [PDF]
Modern Physics Letters A, 2022 In this paper, we show how a modified Friedmann equation, originating from a model of the universe built from a certain [Formula: see text] algebra, has the potential to explain the difference between the Hubble constants extracted from CMB data and from supernova data.
Ambjørn, Jan, Watabiki, Y.
openaire +3 more sources
Proc Natl Acad Sci U S A, 1993 Five methods of estimating distances have demonstrated internal reproducibility at the level of 5-20% rms accuracy. The best of these are the cepheid (and RR Lyrae), planetary nebulae, and surface-brightness fluctuation techniques. Luminosity-line width and Dn-sigma methods are less accurate for an individual case but can be applied to large numbers of
Tully RB.
europepmc +4 more sources
Gravitational Wave analysis using Bayesian Inference to calculate the Hubble Constant [PDF]
, 2023 The Hubble constant is the value of the Hubble parameter (H(t)) at the present epoch and is of interest as it characterises the expansion of the Universe.
Neal, Ruth
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Andromeda’s Parachute: Time Delays and Hubble Constant
The Astrophysical Journal, 2023 The gravitational lens system PS J0147+4630 (Andromeda’s Parachute) consists of four quasar images ABCD and a lensing galaxy. We obtained r -band light curves of ABCD in the 2017−2022 period from monitoring with two 2 m class telescopes.
Vyacheslav N. Shalyapin +3 more
doaj +1 more source
MEASURING THE HUBBLE CONSTANT WITH THE HUBBLE SPACE TELESCOPE [PDF]
Proceedings of the International Astronomical Union, 1995 AbstractTen years ago our team completed the Hubble Space Telescope Key Project on the extragalactic distance scale. Cepheids were detected in some 25 galaxies and used to calibrate four secondary distance indicators that reach out into the expansion field beyond the noise of galaxy peculiar velocities.
Freedman, W., Kennicutt, R., Mould, J.
openaire +3 more sources
Median Statistics and the Hubble Constant [PDF]
Publications of the Astronomical Society of the Pacific, 2011 Following Gott et al. (2001), we use Huchra's final compilation of 553 measurements of the Hubble constant ($H_0$) to determine median statistical constraints on $H_0$. We find $H_0=68 \pm 5.5$ (or $\pm 1$) $\kmsmpc$, where the errors are the 95% statistical and systematic (or statistical) errors.
Chen, Gang, Ratra, Bharat
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The Unsettled Number: Hubble’s Tension
Universe, 2023 One of main sources of uncertainty in modern cosmology is the present rate of the universe’s expansion, H0, called the Hubble constant. Once again, different observational techniques bring about different results, causing new “Hubble tension”.
Jorge L. Cervantes-Cota +2 more
doaj +1 more source
cosmological constant problem and Hubble constantU
, 2023 cosmological constant problem and Hubble ...
Alberto Miró (9003836)
core +1 more source