Power-law cosmology, SN Ia, and BAO

Dolgov, A. D.; Halenka, V.; Tkachev, I.

doi:10.1088/1475-7516/2014/10/047

Cited by 28 publications

(39 citation statements)

References 33 publications

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“…In a bunch of cosmological models, power-law cosmology was proposed with an assumption that the scale factor varies as a(t) ∝ t n (Dolgov 1997;Dolgov et al 2014). Many works have devoted into the study of power-law cosmology.…”

Section: Introductionmentioning

confidence: 99%

“…By using different kinds of observations, this nonaccelerated power-law cosmology was found to be preferred (Melia & Maier 2013;Melia & McClintock 2015; ⋆ E-mail: fayinwang@nju.edu.cn (NJU) Tutusaus et al 2017). However this model was also perceived to be against to SNe Ia and BAO data (Bilicki & Seikel 2012;Dolgov et al 2014;Shafer et al 2015;Haridasu et al 2017). Progress has been made in probing power-law cosmology (Sethi et al 2005;Dev et al 2008;Dolgov et al 2014;Yu & Wang 2014).…”

Section: Introductionmentioning

confidence: 99%

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Probing cosmic acceleration by strong gravitational lensing systems

Wang

2019

Monthly Notices of the Royal Astronomical Society

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Recently, some divergent conclusions about cosmic acceleration were obtained using type Ia supernovae (SNe Ia), with opposite assumptions on the intrinsic luminosity evolution. In this paper, we use strong gravitational lensing systems to probe the cosmic acceleration. Since the theory of strong gravitational lensing is established certainly, and the Einstein radius is determined by stable cosmic geometry. We study two cosmological models, ΛCDM and power-law models, through 152 strong gravitational lensing systems, incorporating with 30 Hubble parameters H(z) and 11 baryon acoustic oscillation (BAO) measurements. Bayesian evidence are introduced to make a one-on-one comparison between cosmological models. Basing on Bayes factors ln B of flat ΛCDM versus power-law and R h = ct models are ln B > 5, we find that the flat ΛCDM is strongly supported by the combination of the datasets. Namely, an accelerating cosmology with non power-law expansion is preferred by our numeration.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Probing cosmic acceleration by strong gravitational lensing systems

Wang

2019

Monthly Notices of the Royal Astronomical Society

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“…In Melia (2015) several claims against R h = ct were refuted, and a list of works favouring R h = ct over ΛCDM was compiled in Melia (2017). Power-law cosmologies with n ≥ 1 have been explored against data in several works such as Gehlaut et al (2003), Dev et al (2008), Sethi et al (2005), Zhu et al (2008), Shafer (2015), Rani et al (2015), Dolgov et al (2014), finding n ∼ 1.5 consistently. In a more recent work (Shafer 2015), power-law and R h = ct models were tested with SN Ia and BAO datasets and were found to be highly disfavoured against ΛCDM.…”

Section: Introductionmentioning

confidence: 99%

Strong evidence for an accelerating Universe

Haridasu

Luković

D’Agostino

et al. 2017

A&A

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A recent analysis of supernova Ia (SN Ia) data claims a "marginal" (∼3σ) evidence for a cosmic acceleration. This result has been complemented with a non-accelerating R h = ct cosmology, which was presented as a valid alternative to the ΛCDM model. In this paper we use the same analysis to show that non-marginal evidence for acceleration is truly found. We compare the standard Friedmann models to the R h = ct cosmology by complementing SN Ia data with baryon acoustic oscillations, gamma ray bursts, and observational Hubble datasets. We also study the power-law model, which is a functional generalisation of R h = ct. We find that the evidence for late-time acceleration cannot be refuted at a 4.56σ confidence level from SN Ia data alone, and at an even stronger confidence level (5.38σ) from our joint analysis. In addition, the non-accelerating R h = ct model fails to statistically compare with the ΛCDM, having a ∆(AIC) ∼ 30.

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“…The described above problems in the sky both in the early, z ∼ 5 − 10, and the present day universe strongly suggest that there exist some new effects outside the standard approach to the theory of formation and evolution of celestial bodies, so the latter demands an essential modification. One possibility is an unusual cosmological expansion law [46,47], such that at these high redshifts the universe happened to be older than in the standard regime.…”

Section: Possible Explanationsmentioning

confidence: 99%

Beasts in Lambda-CDM zoo

Dolgov¹

2017

Phys. Atom. Nuclei

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Recent astronomical discoveries of supermassive black holes (quasars), gamma-bursters, supernovae, and dust at high redshifts, z = (5 -10), are reviewed. Such a dense population of the early universe is at odds with the conventional mechanisms of its possible origin. Similar data from the contemporary universe, which are also in conflict with natural expectations, are considered too. Two possible mechanisms are suggested, at least one of which can potentially solve all these problems. As a by-product of the last model, an abundant cosmological antimatter may be created.

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Power-law cosmology, SN Ia, and BAO

Cited by 28 publications

References 33 publications

Probing cosmic acceleration by strong gravitational lensing systems

Probing cosmic acceleration by strong gravitational lensing systems

Strong evidence for an accelerating Universe

Beasts in Lambda-CDM zoo

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