scholarly journals Searching for Signals of Inhomogeneity Using Multiple Probes of the Cosmic Expansion Rate H(z)

2021 ◽  
Vol 126 (23) ◽  
Author(s):  
S. M. Koksbang
Keyword(s):  
Expansion Rate ◽  
Cosmic Expansion

Ghost dark energy in Rastall theory

2021 ◽  
pp. 2150090
Author(s):  
E. E. Kangal ◽  
M. Salti ◽  
O. Aydogdu
Keyword(s):  
Dark Energy ◽  
Energy Density ◽  
Text Analysis ◽  
Functional Form ◽  
Expansion Rate ◽  
Dark Energy Density ◽  
Cosmic Expansion ◽  
Astrophysical Data ◽  
Ghost Dark Energy ◽  
History Of

Making use of the generalized form of the Ghost dark energy density, which has the functional form [Formula: see text] where [Formula: see text] represents the Hubble expanding rate, the present accelerated enlargement behavior of the cosmos is investigated from the Rastall theory perspective. After finding a relation for the Hubble cosmic expansion rate, we consider recent cosmology-independent measurements calculated for the expansion history of the cosmos to fit the model via the [Formula: see text]-analysis. Moreover, we discuss the cosmographic properties of the model with the help of some cosmological quantities. We show that our model is stable and consistent with the recent astrophysical data. Also, for our model, we investigate cosmological interpretations of thermodynamics.

HOW TO GET LESS HELIUM AND MORE NEUTRINOS FROM BBN

2001 ◽  
Vol 16 (supp01c) ◽  
pp. 1025-1027
Author(s):  
Xuelei Chen
Keyword(s):  
Standard Model ◽  
Gravitational Constant ◽  
Expansion Rate ◽  
Helium Abundance ◽  
Cosmic Expansion ◽  
Quintessence Model

We discuss BBN in the presence of a non-minimally coupled quintessence model. In some of these models, the gravitational constant and cosmic expansion rate are smaller than standard model predicts. The Helium abundance is then smaller, possibly resolve the marginal disagreement between theory and observation. Furthermore, the constraint on neutrino species may also be relaxed.

scholarly journals Statistical analysis with cosmic-expansion-rate measurements and two-point diagnostics

2018 ◽  
Vol 78 (3) ◽  
Author(s):  
Xiaogang Zheng ◽  
Marek Biesiada ◽  
Xuheng Ding ◽  
Shuo Cao ◽  
Sixuan Zhang ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Expansion Rate ◽  
Cosmic Expansion

scholarly journals The completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: a multitracer analysis in Fourier space for measuring the cosmic structure growth and expansion rate

2021 ◽  
Vol 504 (1) ◽  
pp. 33-52
Author(s):  
Gong-Bo Zhao ◽  
Yuting Wang ◽  
Atsushi Taruya ◽  
Weibing Zhang ◽  
Héctor Gil-Marín ◽  
...  
Keyword(s):  
Growth Rate ◽  
Power Spectrum ◽  
Confidence Level ◽  
Expansion Rate ◽  
Fourier Space ◽  
Redshift Range ◽  
Significance Level ◽  
Data Product ◽  
New Development ◽  
Cross Power Spectrum

ABSTRACT We perform a joint BAO and RSD analysis using the eBOSS DR16 LRG and ELG samples in the redshift range of z ∈ [0.6, 1.1], and detect an RSD signal from the cross-power spectrum at a ∼4σ confidence level, i.e., fσ8 = 0.317 ± 0.080 at zeff = 0.77. Based on the chained power spectrum, which is a new development in this work to mitigate the angular systematics, we measure the BAO distances and growth rate simultaneously at two effective redshifts, namely, DM/rd (z = 0.70) = 17.96 ± 0.51, DH/rd (z = 0.70) = 21.22 ± 1.20, fσ8 (z = 0.70) = 0.43 ± 0.05, and DM/rd (z = 0.845) = 18.90 ± 0.78, DH/rd (z = 0.845) = 20.91 ± 2.86, fσ8 (z = 0.845) = 0.30 ± 0.08. Combined with BAO measurements including those from the eBOSS DR16 QSO and Lyman-α sample, our measurement has raised the significance level of a non-zero ΩΛ to ∼11σ. The data product of this work is publicly available at https://github.com/icosmology/eBOSS_DR16_LRGxELG and https://www.sdss.org/science/final-bao-and-rsd-measurements/.

scholarly journals Cosmic expansion from boson and fermion fields

2011 ◽  
Vol 28 (12) ◽  
pp. 125006 ◽  
Author(s):  
Rudinei C de Souza ◽  
Gilberto M Kremer
Keyword(s):  
Cosmic Expansion ◽  
Fermion Fields

scholarly journals Average expansion rate and light propagation in a cosmological Tardis spacetime

2013 ◽  
Vol 2013 (12) ◽  
pp. 051-051 ◽  
Author(s):  
Mikko Lavinto ◽  
Syksy Räsänen ◽  
Sebastian J Szybka
Keyword(s):  
Light Propagation ◽  
Expansion Rate
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