Dark sector unifications: Dark matter-phantom energy, dark matter - constant w dark energy, dark matter-dark energy-dark matter

Perković, Dalibor; Štefančić, Hrvoje

doi:10.1016/j.physletb.2019.134806

Cited by 13 publications

(9 citation statements)

References 48 publications

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“…Once the pressure function is known, it is straightforward to obtain the parameter of Equation of State w(r) = p(r)/ρ(r). Finally, one can plot the (c 2 s , w) relation to obtain a deeper insight into the nature of the matter component producing rotation curve dynamics in the c 2 s (w) formalism [30,31,28,32].…”

Section: Fluid Dark Matter Quantities In Terms Of Rotation Curve Prop...mentioning

confidence: 99%

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Dark matter fluid constraints from galaxy rotation curves

Perković¹,

Štefančić²

2022

Preprint

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Galaxy rotation curves are considered to be convincing evidence for dark matter or some dynamically equivalent alternative mechanism. Starting only from the rotation curve data, we present a model independent approach of testing a very general hypothesis that dark matter has the properties of a barotropic fluid. It is shown how the speed of sound squared can be expressed in terms of rotation curve data and their radial derivatives and how model independent constraints can be obtained from the requirements that it is confined between 0 and c 2 . Using the Milky Way rotation curve data available in the literature, we obtain the constraints on the barotropic fluid speed of sound and illustrate the potential of this approach. Technical challenges, limitations and possible future extensions and improvements of the proposed approach are discussed.

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Section: Fluid Dark Matter Quantities In Terms Of Rotation Curve Prop...mentioning

confidence: 99%

“…In this paper we apply the line of reasoning elaborated in [29,30,31,28,32] to astrophysical systems. In particular, we develop a model independent framework of testing the hypothesis of dark matter being a barotropic perfect fluid using the galaxy rotation curve observational data.…”

Section: Introductionmentioning

confidence: 99%

Dark matter fluid constraints from galaxy rotation curves

Perković¹,

Štefančić²

2022

Preprint

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“…In this paper we apply the line of reasoning elaborated in [44][45][46][47][48] to astrophysical systems. In particular, we develop a model independent framework of testing the hypothesis of dark matter being a barotropic perfect fluid using the galaxy rotation curve observational data.…”

Section: Introductionmentioning

confidence: 99%

Dark matter fluid constraints from galaxy rotation curves

Perković

Štefančić

2023

Eur. Phys. J. C

Self Cite

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Galaxy rotation curves are considered to be convincing evidence for dark matter or some dynamically equivalent alternative mechanism. Starting only from the rotation curve data, we present a model independent approach of testing a general hypothesis that dark matter has the properties of a barotropic fluid. It is shown how the speed of sound squared can be expressed in terms of rotation curve data and their radial derivatives and how model independent constraints can be obtained from the requirements that it is confined between 0 and $$c^2$$ c 2 . Using the Milky Way rotation curve data available in the literature, we obtain the constraints on the barotropic fluid speed of sound and illustrate the potential of this approach. Technical challenges, limitations and possible future extensions and improvements of the proposed approach are discussed.

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“…c 2 s = c 2 s (w). This line of modeling has been successfully applied to the description of cosmological constant boundary crossing [41] and dark energy-dark matter unification [42,43].…”

Section: Introductionmentioning

confidence: 99%

Barotropic fluid compatible parametrizations of dark energy

Perković

Štefančić

2020

Eur. Phys. J. C

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Parametrizations of equation of state parameter as a function of the scale factor or redshift are frequently used in dark energy modeling. The question investigated in this paper is if parametrizations proposed in the literature are compatible with the dark energy being a barotropic fluid. The test of this compatibility is based on the functional form of the speed of sound squared, which for barotropic fluid dark energy follows directly from the function for the Equation of state parameter. The requirement that the speed of sound squared should be between 0 and speed of light squared provides constraints on model parameters using analytical and numerical methods. It is found that this fundamental requirement eliminates a large number of parametrizations as barotropic fluid dark energy models and puts strong constraints on parameters of other dark energy parametrizations.

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Dark sector unifications: Dark matter-phantom energy, dark matter - constant w dark energy, dark matter-dark energy-dark matter

Cited by 13 publications

References 48 publications

Dark matter fluid constraints from galaxy rotation curves

Dark matter fluid constraints from galaxy rotation curves

Dark matter fluid constraints from galaxy rotation curves

Barotropic fluid compatible parametrizations of dark energy

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