Results 31 to 40 of about 114,791 (199)
Price of shifting the Hubble constant [PDF]
Physical Review D, 2018 33 pages, 25 PDF ...
Evslin, Jarah, Sen, Anjan A, Ruchika
openaire +2 more sources
Publications of the Astronomical Society of Australia, 2000 AbstractWith the completion of the Hubble Space Telescope (HST) Key Project on the Extragalactic Distance Scale, it is interesting to form the dimensionless quantity H0t0 by multiplying the Hubble Constant by the age of the Universe. In a matter dominated decelerating Universe with a density exceeding 0·26 of the critical value, H0t0 < 1; in an ...
openaire +2 more sources
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
openaire +3 more sources
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
openaire +1 more source
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
openaire +2 more sources
Revisiting the Oldest Stars as Cosmological Probes: New Constraints on the Hubble Constant
The Astrophysical Journal, 2023 Despite the tremendous advance of observational cosmology, the value of the Hubble constant ( H _0 ) is still controversial (the so-called “Hubble tension”) because of the inconsistency between local/late-time measurements and those derived from the ...
Andrea Cimatti, Michele Moresco
doaj +1 more source
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
doaj +1 more source
The redshift of the gravitationally lensed radio source PKS1830-211 [PDF]
We report on the spectroscopic identification and the long awaited redshift measurement of the heavily obscured, gravitationally lensed radio source PKS 1830-211, which was first observed as a radio Einstein ring.
B. Frye +11 more
core +1 more source
Geometric Characterization of LEO–GEO Inter‐Satellite Links for Bidirectional Communications
International Journal of Satellite Communications and Networking, EarlyView.ABSTRACT Incorporating geosynchronous Earth orbit (GEO) and low Earth orbit (LEO) satellites can extend communication services far beyond the reach of terrestrial infrastructure. A key enabler of such architectures is the establishment of inter‐satellite links (ISLs) between LEOs and GEOs to support bidirectional communications.
Muhammad Furqan +2 more
wiley +1 more source
Mathematical Methods in the Applied Sciences, Volume 49, Issue 9, Page 8681-8690, June 2026.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
wiley +1 more source