Results 1 to 10 of about 170,764 (173)
Cosmic time for multi-component universe [PDF]
Serbian Astronomical Journal, 2020 We determined Weierstrass canonical form of cosmic time formula in the cases of four-component and some three-component universe, assuming the ΛCDM model. In all other cases, we discussed analytical solutions for the cosmic time formula.
Branković D.
doaj +1 more source
A Short Review on the Latest Neutrinos Mass and Number Constraints from Cosmological Observables
Universe, 2022 We review the neutrino science, focusing on its impact on cosmology along with the latest constraints on its mass and number of species. We also discuss its status as a possible solution to some of the recent cosmological tensions, such as the Hubble ...
Ziad Sakr
doaj +1 more source
Designing an Optimal LSST Deep Drilling Program for Cosmology with Type Ia Supernovae
The Astrophysical Journal Supplement Series, 2023 The Vera C. Rubin Observatory’s Legacy Survey of Space and Time (LSST) is forecast to collect a large sample of Type Ia supernovae (SNe Ia) expected to be instrumental in unveiling the nature of dark energy.
Philippe Gris +10 more
doaj +1 more source
The Astrophysical Journal Letters, 2023 The light from an extragalactic source at a distance d will arrive at detectors separated by 100 au at times that differ by as much as 120( d /100 Mpc) ^−1 nanoseconds because of the curvature of the wave front. At gigahertz frequencies, the arrival time
Kyle Boone, Matthew McQuinn
doaj +1 more source
Evidence of the fine-structure constant in H0-tension
Physics Letters B, 2021 Modern precision measurements on Hubble expansion H(z) introduce two integral constraints on background models derived from early and late-time cosmology, based on Planck observations of the BAO and, respectively, H0, here normalized to ΛCDM.
Maurice H.P.M. van Putten
doaj +1 more source
Cosmological Tensions and the Transitional Planck Mass Model
The Astrophysical Journal, 2023 In this follow-up analysis, we update previous constraints on the transitional Planck mass (TPM) modified gravity model using the latest version of EFTCAMB and provide new constraints using South Pole Telescope (SPT) and Planck anisotropy data along with
Joshua A. Kable +3 more
doaj +1 more source
A Bias-free Cosmological Analysis with Quasars Alleviating H 0 Tension
The Astrophysical Journal Supplement Series, 2023 Cosmological models and their parameters are widely debated because of theoretical and observational mismatches of the standard cosmological model, especially the current discrepancy between the value of the Hubble constant, H _0 , obtained by Type Ia ...
Aleksander Łukasz Lenart +4 more
doaj +1 more source
Baryon Physics and Tight Coupling Approximation in Boltzmann Codes
Universe, 2019 We provide two derivations of the baryonic equations that can be straightforwardly implemented in existing Einstein−Boltzmann solvers. One of the derivations begins with an action principle, while the other exploits the conservation of the stress ...
Masroor C. Pookkillath +2 more
doaj +1 more source
Investigating Cosmological Models and the Hubble Tension Using Localized Fast Radio Bursts
The Astrophysical Journal, 2023 We use the dispersion measure (DM) and redshift measurements of 24 localized fast radio bursts (FRBs) to compare cosmological models and investigate the Hubble tension.
Jun-Jie Wei, Fulvio Melia
doaj +1 more source
Observational Cosmology with Artificial Neural Networks
Universe, 2022 In cosmology, the analysis of observational evidence is very important when testing theoretical models of the Universe. Artificial neural networks are powerful and versatile computational tools for data modelling and have recently been considered in the ...
Juan de Dios Rojas Olvera +2 more
doaj +1 more source