Cosmological constraints on a power law universe

Sethi, Geetanjali; Dev, Abha; Jain, Deepak

doi:10.1016/j.physletb.2005.08.005

Cited by 70 publications

(75 citation statements)

References 32 publications

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“…Some simple properties of the Dirac-Milne universe are common to those of a purely linear cosmology studied in Lohiya et al (1998), Kaplinghat et al (1999Kaplinghat et al ( , 2000, and Sethi et al (2005). We briefly recall some of these properties.…”

Section: Some Aspects Of the Thermal History Of The Dirac-milne Universementioning

confidence: 86%

Introducing the Dirac-Milne universe

Benoit-Lévy

Chardin

2012

A&A

105

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The ΛCDM standard model, although an excellent parametrization of the present cosmological data, contains two as yet unobserved components, dark matter and dark energy, that constitute more than 95% of the Universe. Faced with this unsatisfactory situation, we study an unconventional cosmology, the Dirac-Milne universe, a matter-antimatter symmetric cosmology, in which antimatter is supposed to present a negative active gravitational mass. The main feature of this cosmology is the linear evolution of the scale factor with time, which directly solves the age and horizon problems of a matter-dominated universe. We study the concordance of this model to the cosmological test of type Ia supernovae distance measurements and calculate the theoretical primordial abundances of light elements for this cosmology. We also show that the acoustic scale of the cosmic microwave background naturally emerges at the degree scale despite an open geometry.

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Section: Some Aspects Of the Thermal History Of The Dirac-milne Universementioning

confidence: 86%

Introducing the Dirac-Milne universe

Benoit-Lévy

Chardin

2012

A&A

105

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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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“…Most recent PLANCK evaluate of the Hubble constant gives a value of H 0 = 67.3 ± 1.2 km/s/Mpc [26]. Along with the above mentioned evaluates of H 0 , several other authors, [7], [9][10][11][12][13] obtained the constraints on cosmological parameters including H 0 , q and β for open, closed and flat power law cosmology. Numerical results for flat power-law cosmology have been described in Table 2.…”

Section: Introductionmentioning

confidence: 99%

Constraints on cosmological parameters in power-law cosmology

Rani

Altaibayeva

Shahalam

et al. 2015

J. Cosmol. Astropart. Phys.

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Abstract. In this paper, we examine observational constraints on the power law cosmology; essentially dependent on two parameters H 0 (Hubble constant) and q (deceleration parameter). We investigate the constraints on these parameters using the latest 28 points of H(z) data and 580 points of Union2.1 compilation data and, compare the results with the results of ΛCDM. We also forecast constraints using a simulated data set for the future JDEM, supernovae survey. Our studies give better insight into power law cosmology than the earlier done analysis by Kumar [arXiv:1109.6924] indicating it tuning well with Union2.1 compilation data but not with H(z) data. However, the constraints obtained on < H 0 > and < q > i.e. H 0 average and q average using the simulated data set for the future JDEM, supernovae survey are found to be inconsistent with the values obtained from the H(z) and Union2.1 compilation data. We also perform the statefinder analysis and find that the power-law cosmological models approach the standard ΛCDM model as q → −1. Finally, we observe that although the power law cosmology explains several prominent features of evolution of the Universe, it fails in details.

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Cosmological constraints on a power law universe

Cited by 70 publications

References 32 publications

Introducing the Dirac-Milne universe

Introducing the Dirac-Milne universe

Strong evidence for an accelerating Universe

Constraints on cosmological parameters in power-law cosmology

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