Results 81 to 90 of about 6,292 (199)
Can late dark energy transitions raise the Hubble constant?
, 2020 Late times dark energy transitions at redshifts z 0.1 can raise the predicted value of the Hubble constant to the SH0ES value, 74.03±1.42 (km s-1 Mpc-1) or more, while providing an equally good fit as ΛCDM at 67.73±0.41 to higher redshift data, in ...
Raveri M., Hu W., Benevento G.
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
Constraining Electron‐Impact Ionization of O2 Through UV Aurora Observations at Ganymede
Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.Abstract While photoionization rates of Ganymede's O2 ${\mathrm{O}}_{2}$ dominated atmosphere are well constrained, the contribution of electron‐impact ionization is rather uncertain. Previous quantitative estimates have relied on assumptions about densities and energy distributions of precipitating electrons, or on rare spacecraft measurements that ...
Stefan Duling +5 more
wiley +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
A Possible Solution to the Mystery of the ANITA Anomalous Events
Annalen der Physik, Volume 538, Issue 4, April 2026.In 2006 and 2014, the Antarctic Impulsive Transient Antenna (ANITA), a balloon‐borne radio observatory flying over Antarctica, detected two strange upward‐going radio pulse events that have not yet been explained by our current understanding of physics.
Massimo Villata
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
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
Fortschritte der Physik, Volume 74, Issue 4, April 2026.Abstract String theory has strong implications for cosmology, implying the absence of a cosmological constant, ruling out single‐field slow‐roll inflation, and that black holes decay. The origins of these statements are elucidated within the string‐theoretical swampland programme.
Kay Lehnert
wiley +1 more source
Kaniadakis Holographic Dark Energy Behavior in f(Q) Theory
Fortschritte der Physik, Volume 74, Issue 4, April 2026.ABSTRACT In this study, the cosmological behavior of the Kaniadakis holographic dark energy model is investigated under the f(Q)$f(Q)$ theory within the framework of a flat Friedmann–Robertson–Walker (FRW) universe. The generalized holographic energy density based on Kaniadakis entropy is modeled using the Hubble horizon infrared cutoff scale, and the ...
Sinem Kalkan, Can Aktaş
wiley +1 more source
Radio Pulse Power Distribution of Lightning in Jupiter's 2021–2022 Stealth Superstorms
AGU Advances, Volume 7, Issue 2, April 2026.Abstract Surveys and observations of lightning on Jupiter prior to the NASA Juno mission used night‐side imaging approaches, and a common conclusion was that the optical energy was similar to the highest energy terrestrial lightning flashes, or superbolts.
Michael H. Wong +12 more
wiley +1 more source