A generalization to the Rastall theory and cosmic eras
Abstract A generalized version for the Rastall theory is proposed showing the agreement with the cosmic accelerating expansion. In this regard, a coupling between geometry and the pressureless matter fields is derived which may play the role of dark energy, responsible for the current accelerating e...
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doaj-3e1ee2b33d90486f97e14ea5cc8d19ef2020-11-24T21:09:58ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522017-04-017741910.1140/epjc/s10052-017-4811-zA generalization to the Rastall theory and cosmic erasH. Moradpour0Y. Heydarzade1F. Darabi2Ines G. Salako3Research Institute for Astronomy and Astrophysics of Maragha (RIAAM)Department of Physics, Azarbaijan Shahid Madani UniversityDepartment of Physics, Azarbaijan Shahid Madani UniversityInstitut de Mathématiques et de Sciences Physiques (IMSP), Université de Porto-NovoAbstract A generalized version for the Rastall theory is proposed showing the agreement with the cosmic accelerating expansion. In this regard, a coupling between geometry and the pressureless matter fields is derived which may play the role of dark energy, responsible for the current accelerating expansion phase. Moreover, our study also shows that the radiation field may not be coupled to the geometry in a non-minimal way which represents that the ordinary energy-momentum conservation law is respected by the radiation source. It is also shown that the primary inflationary era may be justified by the ability of the geometry to couple to the energy-momentum source in an empty flat FRW universe. In fact, this ability is independent of the existence of the energy-momentum source and may compel the empty flat FRW universe to expand exponentially. Finally, we consider a flat FRW universe field by a spatially homogeneous scalar field evolving in potential $$\mathcal {V}(\phi )$$ V ( ϕ ) , and study the results of applying the slow-roll approximation to the system which may lead to an inflationary phase for the universe expansion.http://link.springer.com/article/10.1140/epjc/s10052-017-4811-zDark EnergyDeceleration ParameterMassive GravityMatter FieldFriedmann Equation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
H. Moradpour Y. Heydarzade F. Darabi Ines G. Salako |
spellingShingle |
H. Moradpour Y. Heydarzade F. Darabi Ines G. Salako A generalization to the Rastall theory and cosmic eras European Physical Journal C: Particles and Fields Dark Energy Deceleration Parameter Massive Gravity Matter Field Friedmann Equation |
author_facet |
H. Moradpour Y. Heydarzade F. Darabi Ines G. Salako |
author_sort |
H. Moradpour |
title |
A generalization to the Rastall theory and cosmic eras |
title_short |
A generalization to the Rastall theory and cosmic eras |
title_full |
A generalization to the Rastall theory and cosmic eras |
title_fullStr |
A generalization to the Rastall theory and cosmic eras |
title_full_unstemmed |
A generalization to the Rastall theory and cosmic eras |
title_sort |
generalization to the rastall theory and cosmic eras |
publisher |
SpringerOpen |
series |
European Physical Journal C: Particles and Fields |
issn |
1434-6044 1434-6052 |
publishDate |
2017-04-01 |
description |
Abstract A generalized version for the Rastall theory is proposed showing the agreement with the cosmic accelerating expansion. In this regard, a coupling between geometry and the pressureless matter fields is derived which may play the role of dark energy, responsible for the current accelerating expansion phase. Moreover, our study also shows that the radiation field may not be coupled to the geometry in a non-minimal way which represents that the ordinary energy-momentum conservation law is respected by the radiation source. It is also shown that the primary inflationary era may be justified by the ability of the geometry to couple to the energy-momentum source in an empty flat FRW universe. In fact, this ability is independent of the existence of the energy-momentum source and may compel the empty flat FRW universe to expand exponentially. Finally, we consider a flat FRW universe field by a spatially homogeneous scalar field evolving in potential $$\mathcal {V}(\phi )$$ V ( ϕ ) , and study the results of applying the slow-roll approximation to the system which may lead to an inflationary phase for the universe expansion. |
topic |
Dark Energy Deceleration Parameter Massive Gravity Matter Field Friedmann Equation |
url |
http://link.springer.com/article/10.1140/epjc/s10052-017-4811-z |
work_keys_str_mv |
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1716756843800297472 |