Results 31 to 40 of about 1,848 (175)
Unimodular Theory of Gravity in Light of the Latest Cosmological Data
Universe, 2023 The unimodular theory of gravity is an alternative perspective to the traditional general relativity of Einstein and opens new possibilities for exploring its implications in cosmology.
Naveen K. Singh, Gopal Kashyap
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The Astrophysical Journal, 1998 18 pages; figure[1-2,7-9].ps are EPS files included in body of text, figure[3-6].jpg are JPEG images not included; LaTeX (AASTeX v4.0); Submitted to The Astrophysical Journal. Compressed PostScript of entire paper with all figures included is available at ftp://mars.tuc.noao.edu/sbf/hubble.ps ...
Lauer, Tod R. +4 more
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Is the Hubble Constant Scale-Dependent? [PDF]
Gravitation and Cosmology, 2018 REVTeX4, 4 pages, accepted for publication in "Gravitation and Cosmology" (Springer), to appear in vol.24, no.2 (2018)
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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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Journal of High Energy Physics, Gravitation and Cosmology, 2016 An analytical method to calculate Hubble’s constant [1] is presented. The proposed procedure is an alternative scheme to the red shifts of spectral lines picture, to obtain the value of that constant [2].
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Mathematical Methods in the Applied Sciences, EarlyView.ABSTRACT Consider wave equations with time derivative nonlinearity and time‐dependent propagation speed which are generalized versions of the wave equations in the Friedmann–Lemaître–Robertson–Walker (FLRW) spacetime, the de Sitter spacetime and the anti‐de Sitter space time.
Kimitoshi Tsutaya, Yuta Wakasugi
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Cepheid parallaxes and the Hubble constant [PDF]
Monthly 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
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Modeling the EMIC Wave‐Induced Acceleration of Energetic Protons in the Io Footprint Tail
Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.Abstract The Io footprint tail (FPT) region is crucial for studying the interactions between Io and Jupiter's magnetosphere. In this region, Juno spacecraft observed significant acceleration of energetic protons, concurrently with electromagnetic ion cyclotron (EMIC) waves below the proton gyro‐frequency.
Peng Lu +6 more
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The Astrophysical Journal LettersWe present high-definition observations with the James Webb Space Telescope (JWST) of >1000 Cepheids in a geometric anchor of the distance ladder, NGC 4258, and in five hosts of eight Type Ia supernovae, a far greater sample than previous studies with ...
Adam G. Riess +9 more
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Perspective on Aqueous Batteries: Historical Milestones and Modern Revival
Advanced Materials, Volume 38, Issue 14, 6 March 2026.This review retraces the development of aqueous batteries from classical Zn‐MnO2 chemistry to modern Zn and Ni systems, correlating voltage, capacity, and electrolyte formulation with practical performance. By mapping historical success and failure onto current and future research directions, it identifies guiding principles that steer the design of ...
Fangwang Ming +5 more
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