Results 61 to 70 of about 1,546,467 (200)
Towards machine-assisted meta-studies: the Hubble constant [PDF]
, 2020 We present an approach for automatic extraction of measured values from the astrophysical literature, using the Hubble constant for our pilot study. Our rules-based model – a classical technique in natural language processing – has successfully extracted
Stenetorp, P +5 more
core +1 more source
Measurement of Hubble constant with stellar-mass binary black holes [PDF]
, 2017 The direct detections of gravitational waves (GW) from merging binary black holes (BBH) by aLIGO have brought us a new opportunity to utilize BBH for a measurement of the Hubble constant.
Atsushi Nishizawa, Nishizawa, Atsushi
core +1 more source
European Physical Journal C: Particles and Fields, 2021 We construct an approximate solution to the cosmological perturbation theory around Einstein–de Sitter background up to the fourth-order perturbations. This could be done with the help of the specific symmetry condition imposed on the metric, from which ...
Szymon Sikora, Krzysztof Głód
doaj +1 more source
Journal of Geophysical Research: Planets, Volume 131, Issue 7, July 2026.Abstract Io's tenuous atmosphere consists primarily of sulfur dioxide (SO2 ${\text{SO}}_{2}$) with observed column densities of approximately 1016−1017 $1{0}^{16}-1{0}^{17}$ cm−2 ${\text{cm}}^{-2}$. However, it remains uncertain whether the sublimation of SO2 ${\text{SO}}_{2}$ surface frost or volcanic outgassing is the primary source of the SO2 ...
Leander Schlarmann +4 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
Background Instability of Quintessence Model in Light of Entropy and Distance Conjecture
Fortschritte der Physik, Volume 74, Issue 6, June 2026.ABSTRACT We apply the covariant entropy bound argument supporting the de Sitter swampland conjecture to the quintessence model, to find out the condition for the background to be unstable. More concretely, the background is unstable when the matter entropy given by the species number of the effective field theory increases more rapidly than the ...
Min‐Seok Seo
wiley +1 more source
Mitigating the Binary Viewing Angle Bias for Standard Sirens
The Astrophysical Journal LettersThe inconsistency between experiments in the measurements of the local Universe expansion rate, the Hubble constant, suggests unknown systematics in the existing experiments or new physics.
Alberto Salvarese, Hsin-Yu Chen
doaj +1 more source
The Hitchhiker’s Guide to the Galaxy Catalog Approach for Dark Siren Gravitational-wave Cosmology
The Astronomical Journal, 2023 We outline the “dark siren” galaxy catalog method for cosmological inference using gravitational wave (GW) standard sirens, clarifying some common misconceptions in the implementation of this method. When a confident transient electromagnetic counterpart
Jonathan R. Gair +30 more
doaj +1 more source
Predicting Nitrogen Isotope Fractionation in Nitrate Deposition on Early Mars
Journal of Geophysical Research: Planets, Volume 131, Issue 6, June 2026.Abstract Noachian and early Hesperian Mars were likely warm and wet, with an atmosphere abundant in molecular nitrogen. The recent discovery of nitrate deposits in the Yellowknife Bay mudstones at Gale Crater confirm the existence of nitrogen oxides (NOX) on Noachian Mars. The processes responsible for the production of these nitrates would fractionate
J. Shawcross +4 more
wiley +1 more source
CARNEGIE HUBBLE PROGRAM: A MID-INFRARED CALIBRATION OF THE HUBBLE CONSTANT [PDF]
The Astrophysical Journal, 2012 Using a mid-infrared calibration of the Cepheid distance scale based on recent observations at 3.6 um with the Spitzer Space Telescope, we have obtained a new, high-accuracy calibration of the Hubble constant. We have established the mid-IR zero point of the Leavitt Law (the Cepheid Period-Luminosity relation) using time-averaged 3.6 um data for ten ...
Freedman, Wendy L. +7 more
openaire +2 more sources