Higher order corrections of the extended Chaplygin gas cosmology with varying G and Lambda


Kahya E. O., KHURSHUDYAN M., POURHASSAN B., MYRZAKULOV R., PASQUA A.

EUROPEAN PHYSICAL JOURNAL C, cilt.75, sa.2, 2015 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 75 Sayı: 2
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1140/epjc/s10052-015-3263-6
  • Dergi Adı: EUROPEAN PHYSICAL JOURNAL C
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

In this paper, we study two different models of dark energy based on the Chaplygin gas equation of state. The first model is the variable modified Chaplygin gas, while the second one is the extended Chaplygin gas. Both models are considered in the framework of higher order f (R) modified gravity. We also consider the case of time-varying gravitational constant G and Lambda for both models. We investigate some cosmological parameters such as the Hubble, the deceleration, and the equation of state parameters. Then we show that the model that we consider, the extended Chaplygin gas with time-dependent G and Lambda, is consistent with the observational data. Finally we conclude with the discussion of cosmological perturbations of our model.