Probing cosmic acceleration by strong gravitational lensing systems

Tu, Zuo-Lin; Hu, Jiajun; Wang, F. Y.

doi:10.1093/mnras/stz286

Cited by 14 publications

(6 citation statements)

References 78 publications

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“…The dominant conventional model is Lambda cold dark matter (ΛCDM), which assumes the existence of dark energy to drive the cosmological expansion, and of cold dark matter to explain the galaxy rotation curves. The model shows good quantitative agreement with empirical measurements [118]. However the identities of neither dark energy nor dark matter are known.…”

Section: Gravitation Special Casessupporting

confidence: 58%

Disjointed Equivalence of Gravitational and Inertial Mass

Pons¹

2023

JMP

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Problem-Contemporary physics offers no underlying reason for the equivalence of inertial and gravitational mass. Approach-The equivalence is examined from the new physics provided by the cordus theory, being a non-local hidden-variable (NLHV) theory. Mathematical formalisms are derived for masses and observers in different fabric densities. Findings-A disjointed equivalence is predicted, whereby inertial and gravitational masses are equivalent in any one situation, but a different equivalence holds when the fabric densities change. Consequently this theory predicts that the gravitational constant G varies with fabric density, and hence would be different

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Section: Gravitation Special Casessupporting

confidence: 58%

Disjointed Equivalence of Gravitational and Inertial Mass

Pons¹

2023

JMP

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“…One can investigate the equation of state (e.o.s) of dark energy (DE) and/or its cosmological evolution by measuring the angular diameter distances of background sources at multiple redshifts behind a lens galaxy or cluster. SGL by elliptical galaxies has been used to probe both cosmology and galaxies [5][6][7][8][9][10][11][12][13][14]. We summarize three main approaches to these methods.…”

Section: Introductionmentioning

confidence: 99%

Constraints on the time variation of the speed of light using Strong lensing

Lee

2021

Preprint

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Due to the recent growth of discoveries of strong gravitational lensing (SGL) systems, one can statistically study both lens properties and cosmological parameters from 161 galactic scale SGL systems. We analyze meVSL model with the velocity dispersion of lenses by adopting the redshift and surface mass density depending power-law mass model. Analysis shows that meVSL models with various dark energy models including ΛCDM, ωCDM, and CPL provide the negative values of meVSL parameter, b when we put the prior to the Ωm0 value from Planck. These indicate the faster speed of light and the stronger gravitational force in the past. However, if we adopt the WMAP prior on Ωm0, then we obtain the null results on b within 1-σ CL for the different dark energy models.

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“…We take R obs = 1.7474 ± 0.0051 for a non-flat Universe and R obs = 1.7482 ± 0.0048 for a flat Universe . As for the BAO, we use the data provided by Alam et al (2017) and the likelihood for BAO can be generally calculated as (Sánchez et al 2017;Tu et al 2019)…”

Section: Cosmology With De-evolved L-t-e P Correlationmentioning

confidence: 99%

X-ray Plateaus in Gamma-Ray Burst Afterglows and Their Application in Cosmology

Xu,

Tang,

Geng

et al. 2020

Preprint

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For gamma-ray bursts (GRBs) with a plateau phase in the X-ray afterglow, a so called L-T-E correlation has been found which tightly connects the isotropic energy of the prompt GRB (E γ,iso ) with the end time of the X-ray plateau (T a ) and the corresponding X-ray luminosity at the end time (L X ). Here we show that there is a clear redshift evolution in the correlation. Furthermore, since the power-law indices of L X and E γ,iso in the correlation function are almost identical, the L-T-E correlation is insensitive to cosmological parameters and cannot be used as a satisfactory standard candle. On the other hand, based on a sample including 121 long GRBs, we establish a new three parameter correlation that connects L X , T a and the spectral peak energy E p , i.e. the L-T-E p correlation. This correlation strongly supports the so called Combo-relation established by Izzo et al. (2015) After correcting for the redshift evolution, we show that the de-evolved L-T-E p correlation can be used as a standard candle. By using this correlation alone, we are able to constrain the cosmological parameters as Ω m = 0.389 +0.202 −0.141 (1σ ) for the flat ΛCDM model, or Ω m = 0.369 +0.217 −0.191 , w = −0.966 +0.513 −0.678 (1σ ) for the flat wCDM model. Combining with other cosmological probes, more accurate constraints on the cosmology models are presented.

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Probing cosmic acceleration by strong gravitational lensing systems

Cited by 14 publications

References 78 publications

Disjointed Equivalence of Gravitational and Inertial Mass

Disjointed Equivalence of Gravitational and Inertial Mass

Constraints on the time variation of the speed of light using Strong lensing

X-ray Plateaus in Gamma-Ray Burst Afterglows and Their Application in Cosmology

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