Signs of dynamical dark energy in current observations

Peracaula, Joan Solà; Gómez-Valent, Adrià; Pérez, Javier de Cruz

doi:10.1016/j.dark.2019.100311

Cited by 74 publications

(47 citation statements)

References 90 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is certainly a more rigorous statistics (but also a much more cumbersome quantity to handle from the computational point of view), see e.g. Solà, Gómez-Valent & Cruz Pérez (2019) for recent applications of this method to cosmological model selection. However, an intermediate criterion which is easier to cope with and still benefits from the direct use of the Markov chains of the MCCM analysis, is the DIC.…”

Section: Model Selection Criteriamentioning

confidence: 99%

“…Not all of the DDEs, however, are equally efficient in this task, see e.g. (Solà, Gómez-Valent & Cruz Pérez 2019;Gómez-Valent, Pettorino & Amendola 2020). Recently, torsional gravity has been invoked as a possible alleviation, in particular through the f (T )-class (Anagnostopoulos, Basilakos & Saridakis 2019;Yan et al 2020) although there is a large arbitrariness in the selection of f (T ).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cosmographic approach to Running Vacuum dark energy models: new constraints using BAOs and Hubble diagrams at higher redshifts

Rezaei,

Sola,

Malekjani

2021

Preprint

View full text Add to dashboard Cite

In this work we study different types of dark energy (DE) models in the framework of the cosmographic approach, with emphasis on the Running Vacuum models (RVMs). We assess their viability using different information criteria and compare them with the so-called Ghost DE models (GDEs) as well as with the concordance ΛCDM model. We use the Hubble diagrams for Pantheon SnIa, quasars (QSOs), gamma-ray bursts (GRBs) as well as the data on baryonic acoustic oscillations (BAOs) in four different combinations. Upon minimizing the χ 2 function of the distance modulus in the context of the Markov Chain Monte Carlo method (MCMC), we put constraints on the current values of the standard cosmographic parameters in a model-independent way. It turns out that, in the absence of BAOs data, the various DE models generally exhibit cosmographic tensions with the observations at the highest redshifts (namely with the QSOs and GRBs data). However, if we include the robust observations from BAOs to our cosmographic sample, the ΛCDM and RVMs are clearly favored against the GDEs. Finally, judging from the perspective of the deviance information criterion (DIC), which enables us to compare models making use of the Markov chains of the MCMC method, we conclude that the RVMs are the preferred kind of DE models. We find it remarkable that these models, which had been previously shown to be capable of alleviating the σ 8 and H 0 tensions, appear now also as the most successful ones at the level of the cosmographic analysis.

show abstract

Section: Model Selection Criteriamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cosmographic approach to Running Vacuum dark energy models: new constraints using BAOs and Hubble diagrams at higher redshifts

Rezaei,

Sola,

Malekjani

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…For observational constraints on the 𝜙CDM model seeYashar et al (2009),,Campanelli et al (2012),,,Avsajanishvili et al (2015),Sòla et al (2017), SòlaPeracaula et al (2018Peracaula et al ( , 2019,Zhai et al (2017),Ooba et al (2018bOoba et al ( , 2019, Sangwan et al (2018), Park & Ratra (2018a), Singh et al (2019), Cao et al (2020b), Ureña-López & Roy (2020) and references therein.MNRAS 000,1-14 (2019) …”

mentioning

confidence: 99%

Determining the range of validity of quasar X-ray and UV flux measurements for constraining cosmological model parameters

Khadka

Ratra

2021

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

We use six different cosmological models to study the recently-released compilation of X-ray and UV flux measurements of 2038 quasars (QSOs) which span the redshift range 0.009 ≤ z ≤ 7.5413. We find, for the full QSO data set, that the parameters of the X-ray and UV luminosities LX − LUV relation used to standardized these QSOs depend on the cosmological model used to determine these parameters, i.e, it appears that the full QSO data set include QSOs that are not standardized and so cannot be used for the purpose of constraining cosmological parameters. Subsets of the QSO data, restricted to redshifts z ≲ 1.5 − 1.7 obey the LX − LUV relation in a cosmological-model-independent manner, and so can be used to constrain cosmological parameters. The cosmological constraints from these lower-z, smaller QSO data subsets are mostly consistent with, but significantly weaker than, those that follow from baryon acoustic oscillation and Hubble parameter measurements.

show abstract

“…For recent observational constraints on the φCDM model seeAvsajanishvili et al (2015), SolàPeracaula et al (2018Peracaula et al ( , 2019,Zhai et al (2017),Ooba et al (2018bOoba et al ( , 2019,Park & Ratra (2018,Sangwan et al (2018),Singh et al (2019), Ureña-López & Roy (2020),Sinha & Banerjee (2021), and references therein.…”

mentioning

confidence: 99%

Cosmological constraints from H ii starburst galaxy apparent magnitude and other cosmological measurements

Cao

Ryan

Ratra

2020

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

We use HII starburst galaxy apparent magnitude measurements to constrain cosmological parameters in six cosmological models. A joint analysis of HII galaxy, quasar angular size, baryon acoustic oscillations peak length scale, and Hubble parameter measurements result in relatively model-independent and restrictive estimates of the current values of the non-relativistic matter density parameter $\Omega _{\rm m_0}$ and the Hubble constant H0. These estimates favor a 2.0σ to 3.4σ (depending on cosmological model) lower H0 than what is measured from the local expansion rate. The combined data are consistent with dark energy being a cosmological constant and with flat spatial hypersurfaces, but do not strongly rule out mild dark energy dynamics or slightly non-flat spatial geometries.

show abstract

Signs of dynamical dark energy in current observations

Cited by 74 publications

References 90 publications

Cosmographic approach to Running Vacuum dark energy models: new constraints using BAOs and Hubble diagrams at higher redshifts

Cosmographic approach to Running Vacuum dark energy models: new constraints using BAOs and Hubble diagrams at higher redshifts

Determining the range of validity of quasar X-ray and UV flux measurements for constraining cosmological model parameters

Cosmological constraints from H ii starburst galaxy apparent magnitude and other cosmological measurements

Contact Info

Product

Resources

About