Observational constraints on Hubble parameter in viscous generalized Chaplygin gas
Sign Up to like & getrecommendations! Published in 2018 at "Indian Journal of Physics"
DOI: 10.1007/s12648-017-1126-8
Abstract: Cosmological model with viscous generalized Chaplygin gas (in short, VGCG) is considered here to determine observational constraints on its equation of state parameters (in short, EoS) from background data. These data consists of $$H(z)-z$$H(z)-z (OHD)… read more here.
Keywords: hubble parameter; generalized chaplygin; chaplygin gas; viscous generalized ... See more keywords
Intrinsic torsion, extrinsic torsion, and the Hubble parameter
Sign Up to like & getrecommendations! Published in 2024 at "Classical and Quantum Gravity"
DOI: 10.1088/1361-6382/add463
Abstract: We study the intrinsic and extrinsic torsions (defined by analogy with the intrinsic and extrinsic curvatures) of the spatial sections of torsional spacetimes. We consider two possibilities. First, that the intrinsic torsion might prove to… read more here.
Keywords: intrinsic torsion; torsion; torsion extrinsic; hubble parameter ... See more keywords
Reconstructing inflation and reheating in the framework of a generalized F (H) Friedmann equation
Sign Up to like & getrecommendations! Published in 2024 at "Physica Scripta"
DOI: 10.1088/1402-4896/adde90
Abstract: The reconstruction of an inflationary universe considering the parametrization of the scalar spectral index as a function of the number of e − folds in the framework of a modified Friedmann equation is analyzed. In… read more here.
Keywords: equation; hubble parameter; friedmann equation; inflation reheating ... See more keywords
Observational constraint on spherical inhomogeneity with CMB and local Hubble parameter
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2018/03/033
Abstract: We derive an observational constraint on a spherical inhomogeneity of the void centered at our position from the angular power spectrum of the cosmic microwave background(CMB) and local measurements of the Hubble parameter. The late… read more here.
Keywords: local hubble; hubble parameter; cmb local; observational constraint ... See more keywords
Constraints on dark energy dynamics and spatial curvature from Hubble parameter and baryon acoustic oscillation data
Sign Up to like & getrecommendations! Published in 2018 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/sty1922
Abstract: We use all available baryon acoustic oscillation distance measurements and Hubble parameter data to constrain the cosmological constant $\Lambda$, dynamical dark energy, and spatial curvature in simple cosmological models. We find that the consensus spatially… read more here.
Keywords: baryon acoustic; hubble parameter; energy; acoustic oscillation ... See more keywords
Equivalence of the Chern-Simons state and the Hartle-Hawking and Vilenkin wave functions
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review D"
DOI: 10.1103/physrevd.102.044034
Abstract: We show that the Chern-Simons (CS) state when reduced to mini-superspace is the Fourier dual of the Hartle-Hawking (HH) and Vilenkin (V) wave-functions of the Universe. This is to be expected, given that the former… read more here.
Keywords: chern simons; hubble parameter; wave; simons state ... See more keywords
Tachyon constant-roll inflation
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review D"
DOI: 10.1103/physrevd.97.083006
Abstract: The constant-roll inflation is studied where the inflaton is taken as a tachyon field. Based on this approach, the second slow-roll parameter is taken as a constant which leads to a differential equation for the… read more here.
Keywords: hubble parameter; roll; constant roll; parameter ... See more keywords
Bouncing cosmology in f (R ,T ) gravity
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review D"
DOI: 10.1103/physrevd.97.123536
Abstract: A cosmological model with a specific form of the Hubble parameter is constructed in a flat homogeneous, and isotropic background in the framework of f(R,T) gravity, where R is the scalar curvature and T is… read more here.
Keywords: hubble parameter; cosmology; model; bouncing cosmology ... See more keywords
Křížek–Somer Anthropic Principle and the Problem of Local Hubble Expansion
Sign Up to like & getrecommendations! Published in 2025 at "Gravitation and Cosmology"
DOI: 10.1134/s0202289325700094
Abstract: According to the Křížek–Somer hypothesis [New Astron. 17, 1 (2012); Grav. Cosmol. 21, 59 (2015)], a biological evolution of the Earth is possible only at certain values of the Hubble parameter, because the increasing luminosity… read more here.
Keywords: somer anthropic; hubble parameter; local hubble; hubble expansion ... See more keywords
Probing Dark Energy Properties in f(Q,C) Gravity with FLRW Cosmological Models
Sign Up to like & getrecommendations! Published in 2024 at "International Journal of Geometric Methods in Modern Physics"
DOI: 10.1142/s021988782550166x
Abstract: This study delves into the cosmological implications of the $f(Q,C)$ modified gravity framework within the context of the FLRW spacetime which offers a dynamic alternative to the standard $\Lambda$CDM cosmology. Here, we define the transit… read more here.
Keywords: energy; dark energy; energy properties; hubble parameter ... See more keywords