We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
LRS Bianchi I model with constant deceleration parameter.
- Authors
Singh, Vijay; Beesham, Aroonkumar
- Abstract
An LRS Bianchi I model is considered with constant deceleration parameter, q = α - 1 , where α ≥ 0 is a constant. The physical and kinematical behaviour of the models for α = 0 and α ≠ 0 is studied in detail. The model with α = 0 describes late time acceleration, but eternal inflation demands a violation of the NEC and WEC. The acceleration is caused by phantom matter which approaches a cosmological constant at late times. The solutions with a scalar field also show that the model is compatible with a phantom field only. A comparison with the observational outcomes indicates that the universe has entered into the present accelerating phase in recent past somewhere between 0.2 ≲ z ≲ 0.5 . The model obeys the "cosmic no hair conjecture". The models with 0 < α < 1 describe late time acceleration driven by quintessence dark energy. A violation of the NEC and WEC is The models with 1 < a < 3 describe decelerating phases which are usually occur in the presence of dust or radiation. The models with α > 3 violate the DEC and the corresponding scalar field models have negative potential which is physically unrealistic.
- Subjects
ACCELERATION (Mechanics); SCALAR field theory; PHYSICAL cosmology; COSMOLOGICAL constant; DARK energy
- Publication
General Relativity & Gravitation, 2019, Vol 51, Issue 12, p1
- ISSN
0001-7701
- Publication type
Article
- DOI
10.1007/s10714-019-2650-y