LRS Bianchi type I models with anisotropic dark energy and constant deceleration parameter

Akarsu O., Kilinc C. B.

GENERAL RELATIVITY AND GRAVITATION, cilt.42, sa.1, ss.119-140, 2010 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 42 Sayı: 1
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1007/s10714-009-0821-y
  • Dergi Adı: GENERAL RELATIVITY AND GRAVITATION
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.119-140
  • Anahtar Kelimeler: Anisotropic dark energy, Dynamical dark energy, LRS Bianchi type I, Constant deceleration parameter, PROBE WMAP OBSERVATIONS, INFLATIONARY UNIVERSE SCENARIO, GENERAL-RELATIVITY, COSMOLOGICAL MODELS, PHASE-TRANSITION, POSITION ANGLES, MICROWAVE, POLARIZATION, MAPS, PERTURBATIONS
  • İstanbul Teknik Üniversitesi Adresli: Hayır

Özet

Locally rotationally symmetric Bianchi type I cosmological models are examined in the presence of dynamically anisotropic dark energy and perfect fluid. We assume that the dark energy (DE) is minimally interacting, has dynamical energy density, anisotropic equation of state parameter (EoS). The conservation of the energy-momentum tensor of the DE is assumed to consist of two separately additive conserved parts. A special law is assumed for the deviation from isotropic EoS, which is consistent with the assumption on the conservation of the energy-momentum tensor of the DE. Exact solutions of Einstein's field equations are obtained by assuming a special law of variation for the mean Hubble parameter, which yields a constant value of the deceleration parameter. Geometrical and kinematic properties of the models and the behaviour of the anisotropy of the dark energy have been carried out. The models give dynamically anisotropic expansion history for the universe that allows to fine tune the isotropization of the Bianchi metric, hence the CMB anisotropy.