Observational challenges for the standard FLRW model

Buchert, Thomas; Coley, A. A.; Kleinert, H.; Roukema, Boudewijn F.; Wiltshire, David L.

doi:10.1142/9789813226609_0034

Cited by 23 publications

(30 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The theoretical predictions are highly consistent with the results obtained from the cosmic microwave background radiation (CMB) detectors including the observations from the Wilkinson Microwave Anisotropy Probe (WMAP) [4,5] and Planck [6,7]. The standard inflationary model is based on an assumption that the spacetime of the early universe can be described by the homogeneous and isotropic Friedmann-LemaitreRobertson-Walker (FLRW) metric [8]. Anomalies of the CMB such as the hemispherical asymmetry and the cold spot are, however, detected by WMAP and then Planck [4][5][6][7][8].…”

Section: Introductionsupporting

confidence: 68%

See 1 more Smart Citation

Anisotropic power-law inflation of the five dimensional scalar–vector and scalar-Kalb–Ramond model

Tuan

Kao

2018

Eur. Phys. J. C

View full text Add to dashboard Cite

We will study the cosmological implications of the five dimensional scalar-vector and scalar-Kalb-Ramond model. In particular, a new set of Bianchi type I power-law analytic solution will be obtained for this model. The cosmic no-hair conjecture can be shown to break down in the presence of the scalar-vector and scalar-Kalb-Ramond couplings. The effect of the Kalb-Ramond field in the presence of the power-law solution will be shown explicitly. We will also show that the presence of a phantom field does, however, destabilize the corresponding Bianchi type I power-law inflationary solutions.

show abstract

Section: Introductionsupporting

confidence: 68%

“…The standard inflationary model is based on an assumption that the spacetime of the early universe can be described by the homogeneous and isotropic Friedmann-LemaitreRobertson-Walker (FLRW) metric [8]. Anomalies of the CMB such as the hemispherical asymmetry and the cold spot are, however, detected by WMAP and then Planck [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic power-law inflation of the five dimensional scalar–vector and scalar-Kalb–Ramond model

Tuan

Kao

2018

Eur. Phys. J. C

View full text Add to dashboard Cite

show abstract

“…For example the hemispherical asymmetry and the cold spot have been detected by the WMAP and Planck. Anisotropic models have therefore been considered as a genearalization of the FLRW inflation [8]. Consequently, modifications for the FLRW inflation are also necessary in order to accommodate the nature of the observed anomalies of CMB.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic power-law inflation for a conformal-violating Maxwell model

Tuan

Kao

2018

Eur. Phys. J. C

View full text Add to dashboard Cite

A set of power-law solutions of a conformalviolating Maxwell model with a non-standard scalar-vector coupling will be shown in this paper. In particular, we are interested in a coupling term of the form X 2n F μν F μν with X denoting the kinetic term of the scalar field. Stability analysis indicates that the new set of anisotropic power-law solutions is unstable during the inflationary phase. The result is consistent with the cosmic no-hair conjecture. We show, however, that a set of stable slowly expanding solutions does exist for a small range of parameters λ and n. Hence a small anisotropy can survive during the slowly expanding phase.

show abstract

“…For a recent review on the various data sets, see e. g. [1]. Although there is currently no competing cosmological model, there remain tensions [2] which justify the investigation of alternatives. The ΛCDM concordance model is based on two dark ingredients, the dark energy in the form of the cosmological constant Λ and the cold dark matter (CDM).…”

Section: Introductionmentioning

confidence: 99%

On the concordance of cosmological data in the case of the generalized Chaplygin gas

Aurich¹,

Lustig²

2018

Astroparticle Physics

View full text Add to dashboard Cite

The generalized Chaplygin gas cosmology provides a prime example for the class of unified dark matter models, which substitute the two dark components of the standard cosmological ΛCDM concordance model by a single dark component. The equation of state of the generalized Chaplygin gas is characterised by a parameter α such that the standard ΛCDM model is recovered in the case α = 0 with respect to the background dynamics and the cosmic microwave background (CMB) statistics. This allows to investigate the concordance of different cosmological data sets with respect to α. We compare the supernova data of the Supernova Cosmology Project, the data of the baryon oscillation spectroscopic survey (BOSS) of the third Sloan digital sky survey (SDSS-III) and the CMB data of the Planck 2015 data release. The importance of the BOSS Lyman α forest BAO measurements is investigated. It is found that these data sets possess a common overlap of the confidence domains only for Chaplygin gas cosmologies very close to the ΛCDM model.

show abstract

Observational challenges for the standard FLRW model

Cited by 23 publications

References 51 publications

Anisotropic power-law inflation of the five dimensional scalar–vector and scalar-Kalb–Ramond model

Anisotropic power-law inflation of the five dimensional scalar–vector and scalar-Kalb–Ramond model

Anisotropic power-law inflation for a conformal-violating Maxwell model

On the concordance of cosmological data in the case of the generalized Chaplygin gas

Contact Info

Product

Resources

About