The universe dominated by the extended Chaplygin gas

Kahya E. O., POURHASSAN B.

MODERN PHYSICS LETTERS A, cilt.30, sa.13, 2015 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 30 Sayı: 13
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1142/s0217732315500704
  • Dergi Adı: MODERN PHYSICS LETTERS A
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: Cosmology, dark energy, COSMOLOGICAL CONSTANT, THERMODYNAMIC STABILITY, QUINTESSENCE, ENERGY, INFLATIONARY, CONSTRAINTS, BRANE
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

In this paper, we consider a universe dominated by the extended Chaplygin gas which was recently proposed as the last version of Chaplygin gas models. Here, we only consider the second-order term which recovers quadratic barotropic fluid equation of state. The density perturbations are analyzed in both relativistic and Newtonian regimes and show that the model is stable without any phase transition and critical point. We confirmed stability of the model using thermodynamics point of view.