A Polytropic Solution of the Expanding Universe – Constraining Relativistic and Non-Relativistic Matter Densities Using Astronomical Results

Öztaş, Ahmet Mecit; Smith, Michael L.

doi:10.5772/24774

Aspects of Today's Cosmology 2011

DOI: 10.5772/24774

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A Polytropic Solution of the Expanding Universe – Constraining Relativistic and Non-Relativistic Matter Densities Using Astronomical Results

Ahmet Mecit Öztaş¹,

Michael L. Smith²

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2020

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Testing adiabatic expansion of polytropic universe model with SNe Ia data

2020

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In order to obtain a better fit for the observational data, various cosmological models have been developed in the literature. For this purpose, we propose an adiabatic expansion of the Universe with a polytropic fluid matter-radiation content and a varying cosmological constant. Basic motivation of this study basically differs from the previous models because our model does not neglect the pressure of the matter content of the Universe. We present the details of our new derivations by obtaining the polytropic matter density and luminosity distances. After constructing the model, two large collections of observational data of supernovae type Ia (SNe Ia) are conducted to diagnose the model. Examining the fitness of our new models of a polytropic universe with the observational data, we find a significant influence of polytropic matter on the cosmological parameters of the expanding universe. We find that our flat constant Λ model and varying Λ model describes the SNe Ia data significantly better than the other models including the standard model for Gold Data and Union2.1 Data, respectively.

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Testing adiabatic expansion of polytropic universe model with SNe Ia data

2020

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A Polytropic Solution of the Expanding Universe – Constraining Relativistic and Non-Relativistic Matter Densities Using Astronomical Results

Cited by 1 publication

References 45 publications

Testing adiabatic expansion of polytropic universe model with SNe Ia data

Testing adiabatic expansion of polytropic universe model with SNe Ia data

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