Anisotropic Cosmological Models with a Generalized Chaplygin Gas

Mebarki, N.

doi:10.1063/1.3462599

AIP Conference Proceedings

2010

DOI: 10.1063/1.3462599

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Anisotropic Cosmological Models with a Generalized Chaplygin Gas

N. Mebarki¹

Abstract: Abstract. Anisotropic cosmological models with a generalized Chaplygin gas in a Finsler space-time geometry are considered and a class of exact solutions as well as cosmological parameters behaviors are studied. Moreover, the viability and stability criteria for a general solution are also discussed.

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2021

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Dynamical study of ellipsoidal universes

Abdelali

Mebarki

2021

J. Phys.: Conf. Ser.

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A Universe containing uniform magnetic fields, strings, or domain walls is shown to have an ellipsoidal expansion. This case is motivated from observational cosmology, especially the anomaly concerning the low quadrupole amplitude compared to the best-fit ΛCDM prediction in WMAP data. It is shown that a Universe with eccentricity at decoupling of order 10−2 can reduce the quadrupole amplitude without affecting higher multipoles of the angular power spectrum of the temperature anisotropy. The evolution of ellipsoidal Universes is studied using dynamical system techniques for the first time. The determined critical points vary between saddle and past attractors depending on dark energy state equation parameter w Λ, with no future attractors. Numerical integrations of this dynamical system done using several initial conditions are showing new important results. For instance, a tendency for high expansion differences between planar and perpendicular axes is observed which contradicts previous assumptions on the evolution behaviour of ellipsoid Universes.

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Dynamical study of ellipsoidal universes

Abdelali

Mebarki

2021

J. Phys.: Conf. Ser.

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show abstract

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Anisotropic Cosmological Models with a Generalized Chaplygin Gas

Cited by 1 publication

References 16 publications

Dynamical study of ellipsoidal universes

Dynamical study of ellipsoidal universes

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