Dark Energy Explained by a Bias in the Measurements

Deledicque, Vincent

doi:10.1007/s10701-022-00575-9

Cited by 4 publications

(9 citation statements)

References 21 publications

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“…where ρ is the average density over space, and where a has been normalized to be dimensionless, such that a = 1 at the current time. This approach, however, does not allow to investigate the effect of the bias identified in [7]. Indeed, if initially matter was distributed in an almost homogeneous way, small perturbations developed, sharpening progressively the local inhomogeneous character of space.…”

Section: The Two-regions Modelmentioning

confidence: 99%

“…Despite a relatively broad consensus in the scientific community on the reality of the accelerated expansion, generally attributed to some form of dark energy, alternative theories have been proposed to explain the results obtained by those cosmological probes. Recently, it has been suggested by [7] that a bias in the SNIa measurements could result in an apparent dark energy effect, explaining thus the accelerated expansion as an observational artefact. The bias is related Development of a model to investigate the effect of the bias in SNIa measurements related to the inhomogeneity of space to the fact that space is not homogeneous, as supposed in theory, and that SNIa occur preferentially in overdense regions, in which matter has grouped together.…”

Section: Introductionmentioning

confidence: 99%

“…Since those regions have their own dynamics, which cannot be considered as representative of the one of the universe at large scale, measurements performed on SNIa should necessarily be altered by this inhomogeneity. Its was shown in [7] by using a global approach that this bias could explain the appearance of an apparent cosmological constant in the Einstein equation of General Relativity. However, this global approach did not allow for a detailed understanding of the underlying cause in the SNIa measurements that led to observe an accelerated expansion.…”

Section: Introductionmentioning

confidence: 99%

“…However, this global approach did not allow for a detailed understanding of the underlying cause in the SNIa measurements that led to observe an accelerated expansion. The aim of this article is to continue the work of [7], by developing a model to better understand how SNIa measurements could be affected by the bias.…”

Section: Introductionmentioning

confidence: 99%

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Development of a model to investigate the effect of the bias in SNIa measurements related to the inhomogeneity of space

Deledicque¹

2023

Preprint

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It has been suggested recently that the appparent accelerated expansion of the universe could be explained by a bias in the SNIa measurements. Such events indeed occur mainly in overdense regions, where matter is located, and whose dynamics can perhaps not been considered as representative of the one of the universe. In this article, we develop a model to investigate in more detail the effect of this bias. This model depends on one single parameter, related to the void fraction of space, and leads to simple analytical relations. We in particular determine the average metric tensor in overdense regions, and deduce that the scale factor and the rate at which time progresses in such regions differ significantly from the corresponding values expected on the average space. We then quantitatively deduce how redshift and luminosity distance measurements are affected by the bias, taking into account the perturbation of the metric tensor. Using a value for the void fraction corresponding to the order of magnitude found in the literature, we show that the model is able to predict a distance modulus versus redshift relation being in excellent aggreement with the one corresponding to a universe characterized by Ω m,0 = 0.3 and Ω Λ,0 = 0.7.

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Section: The Two-regions Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Development of a model to investigate the effect of the bias in SNIa measurements related to the inhomogeneity of space

Deledicque¹

2023

Preprint

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show abstract

“…[28]) or suppose that the supernovae sources tend to be associated with overdensities (see, e.g., Ref. [29]). Finally, many papers focus on the role of matter inhomogeneities and anisotropies that may affect the cosmic expansion due to backreaction or statistical sampling effects (see, e.g., Refs.…”

Section: Introductionmentioning

confidence: 99%

The Nature of Dark Energy and Constraints on Its Hypothetical Constituents from Force Measurements

Klimchitskaya,

Mostepanenko

2024

Universe

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This review considers the theoretical approaches to the understanding of dark energy, which comprises approximately 68% of the energy of our Universe and explains the acceleration in its expansion. Following a discussion of the main approach based on Einstein’s equations with the cosmological term, the explanations of dark energy using the concept of some kind of scalar field are elucidated. These include the concept of a quintessence and modifications of the general theory of relativity by means of the scalar–tensor gravity exploiting the chameleon, symmetron and environment-dependent dilaton fields and corresponding particles. After mentioning several laboratory experiments allowing us to constrain the hypothetical scalar fields modeling the dark energy, special attention is devoted to the possibility of constraining the parameters of chameleon, symmetron and environment-dependent dilaton fields from measuring the Casimir force. It is concluded that the parameters of each of these fields can be significantly strengthened in near future by using the next-generation setups in preparation suitable for measuring the Casimir force at larger separations.

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Development of a model to investigate the effect of the bias in SNIa measurements related to the inhomogeneity of space

Deledicque¹

2023

Eur. Phys. J. C

Self Cite

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It has been suggested recently that the apparent accelerated expansion of the universe could be explained by a bias in the SNIa measurements. Such events indeed occur mainly in overdense regions, where matter is located, and whose dynamics can perhaps not been considered as representative of the one of the universe. In this article, we develop a model to investigate in more detail the effect of this bias. This model depends on one single parameter, related to the void fraction of space, and leads to simple analytical relations. We determine in particular the average metric tensor in overdense regions, and deduce that the scale factor and the rate at which proper time progresses in such regions differ significantly from the corresponding values expected on the average space. We then quantitatively deduce how redshift and luminosity distance measurements are affected by the bias, taking into account the perturbation of the metric tensor. Using a value for the void fraction corresponding to the order of magnitude found in the literature, we show that the model is able to predict a distance modulus versus redshift relation being in excellent agreement with the one corresponding to a universe characterized by $$\Omega _{m,0} = 0.3$$ Ω m , 0 = 0.3 and $$\Omega _{\Lambda ,0} = 0.7$$ Ω Λ , 0 = 0.7 .

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Dark Energy Explained by a Bias in the Measurements

Cited by 4 publications

References 21 publications

Development of a model to investigate the effect of the bias in SNIa measurements related to the inhomogeneity of space

Development of a model to investigate the effect of the bias in SNIa measurements related to the inhomogeneity of space

The Nature of Dark Energy and Constraints on Its Hypothetical Constituents from Force Measurements

Development of a model to investigate the effect of the bias in SNIa measurements related to the inhomogeneity of space

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