Results 11 to 20 of about 114,518 (203)
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.
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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.
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The Astrophysical Journal Letters, 2023 High-resolution James Webb Space Telescope (JWST) observations can test confusion-limited Hubble Space Telescope (HST) observations for a photometric bias that could affect extragalactic Cepheids and the determination of the Hubble constant.
Adam G. Riess +9 more
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Physics Letters B, 2023 Hubble constant is found relating velocities and distances of galaxies. Actually Cepheid stars and cosmic background radiation present two distinct values for the Hubble constant.
Bráulio Batista Soares +3 more
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Hubble constant in the axi-Higgs universe
Physical Review Research, 2023 The Λ-cold-dark-matter (ΛCDM) model provides an excellent fit to the cosmic microwave background (CMB) data. However, a statistically significant tension emerges when its determination of the Hubble constant H_{0} is compared to the local distance ...
Leo W. H. Fung +5 more
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Supernova calibration by gravitational waves
European Physical Journal C: Particles and Fields, 2023 Hubble tension is one of the most important problems in cosmology. Although the local measurements on the Hubble constant with Type Ia supernovae (SNe Ia) are independent of cosmological models, they suffer the problem of zero-point calibration of the ...
Xuchen Lu, Yungui Gong
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Anthropic Principle and the Hubble-Lemaître Constant
Galaxies, 2022 According to the weak formulation of the anthropic principle, all fundamental physical constants have just such values that they enabled the origin of life.
Michal Křížek, Lawrence Somer
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DETERMINING THE HUBBLE CONSTANT FROM HUBBLE PARAMETER MEASUREMENTS [PDF]
The Astrophysical Journal, 2017 Abstract We use 28 measurements of the Hubble parameter, H(z), at intermediate redshifts to determine the present-day Hubble constant H 0 in four cosmological models. We measure , and
Yun Chen, Suresh Kumar, Bharat Ratra
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Acta 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
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CATS: The Hubble Constant from Standardized TRGB and Type Ia Supernova Measurements
The Astrophysical Journal Letters, 2023 The tip of the red giant branch (TRGB) provides a luminous standard candle for constructing distance ladders to measure the Hubble constant. In practice, its measurements via edge-detection response (EDR) are complicated by the apparent fuzziness of the ...
D. Scolnic +9 more
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