Results 31 to 40 of about 170,764 (173)

Radio Plateaus in Gamma-Ray Burst Afterglows and Their Application in Cosmology

open access: yesThe Astrophysical Journal, 2023
The plateau phase in radio afterglows has been observed in very few gamma-ray bursts (GRBs), and in this paper, 27 radio light curves with plateau phases were acquired from the published literature.
Xiao Tian   +6 more
doaj   +1 more source

Hubble Tension: The Evidence of New Physics

open access: yesUniverse, 2023
The ΛCDM model provides a good fit to most astronomical observations but harbors large areas of phenomenology and ignorance. With the improvements in the precision and number of observations, discrepancies between key cosmological parameters of this ...
Jian-Ping Hu, Fa-Yin Wang
doaj   +1 more source

STATEFINDER PARAMETERS FOR FIVE-DIMENSIONAL COSMOLOGY [PDF]

open access: yesModern Physics Letters A, 2008
We study the statefinder parameter in the five-dimensional big bounce model, and apply it to differentiate the attractor solutions of quintessence and phantom field. It is found that the evolving trajectories of these two attractor solutions in the statefinder parameters plane are quite different, and that are different from the statefinder ...
Chang, Baorong   +3 more
openaire   +3 more sources

Cosmological parameters from SDSS and WMAP

open access: yes, 2004
We measure cosmological parameters using the three-dimensional power spectrum P(k) from over 200,000 galaxies in the Sloan Digital Sky Survey (SDSS) in combination with WMAP and other data.
A. de Oliveira-Costa   +202 more
core   +1 more source

Power Spectrum Covariance of Weak Gravitational Lensing [PDF]

open access: yes, 2000
Weak gravitational lensing observations probe the spectrum and evolution of density fluctuations and the cosmological parameters which govern them. At low redshifts, the non-linear gravitational evolution of large scale structure produces a non-Gaussian ...
Bernardeau F.   +7 more
core   +2 more sources

Composite dark energy: cosmon models with running cosmological term and gravitational coupling [PDF]

open access: yes, 2006
In the recent literature on dark energy (DE) model building we have learnt that cosmologies with variable cosmological parameters can mimic more traditional DE pictures exclusively based on scalar fields (e.g. quintessence and phantom).
Amendola   +65 more
core   +2 more sources

Inhomogeneity-induced variance of cosmological parameters

open access: yes, 2012
Modern cosmology relies on the assumption of large-scale isotropy and homogeneity of the Universe. However, locally the Universe is inhomogeneous and anisotropic.
Schwarz, Dominik J., Wiegand, Alexander
core   +1 more source

The Atacama Cosmology Telescope: A Measurement of the DR6 CMB Lensing Power Spectrum and Its Implications for Structure Growth

open access: yesThe Astrophysical Journal
We present new measurements of cosmic microwave background (CMB) lensing over 9400 deg ^2 of the sky. These lensing measurements are derived from the Atacama Cosmology Telescope (ACT) Data Release 6 (DR6) CMB data set, which consists of five seasons of ...
Frank J. Qu   +157 more
doaj   +1 more source

CHANDRACLUSTER COSMOLOGY PROJECT III: COSMOLOGICAL PARAMETER CONSTRAINTS [PDF]

open access: yesThe Astrophysical Journal, 2009
Chandra observations of large samples of galaxy clusters detected in X-rays by ROSAT provide a new, robust determination of the cluster mass functions at low and high redshifts. Statistical and systematic errors are now sufficiently small, and the redshift leverage sufficiently large for the mass function evolution to be used as a useful growth of ...
Vikhlinin, A.   +10 more
openaire   +8 more sources

Axion Dark Matter and Cosmological Parameters

open access: yes, 2012
We observe that photon cooling after big bang nucleosynthesis (BBN) but before recombination can remove the conflict between the observed and theoretically predicted value of the primordial abundance of $^7$Li.
A. J. Korn   +4 more
core   +1 more source

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