کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1783818 | 1524079 | 2016 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Scalar field and time varying cosmological constant in f(R,T) gravity for Bianchi type-I universe
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک اتمی و مولکولی و اپتیک
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In this article, we have analysed the behavior of scalar field and cosmological constant in f(R,T) theory of gravity. Here, we have considered the simplest form of f(R,T), i.e. f(R,T)Â =Â RÂ +Â 2f(T), where R is the Ricci scalar and T is the trace of the energy momentum tensor, and explored the spatially homogeneous and anisotropic Locally Rotationally Symmetric (LRS) Bianchi type-I cosmological model. It is assumed that the Universe is filled with two non-interacting matter sources, namely, scalar field (normal or phantom) with scalar potential and matter contribution due to f(R,T) action. We have discussed two cosmological models according to power law and exponential law of the volume expansion along with constant and exponential scalar potential as sub models. Power law models are compatible with normal (quintessence) and phantom scalar field, whereas exponential volume expansion models are compatible with only normal (quintessence) scalar field. The values of cosmological constant in our models are in agreement with the observational results. Finally, we have discussed some physical and kinematical properties of both models.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chinese Journal of Physics - Volume 54, Issue 2, April 2016, Pages 244-255
Journal: Chinese Journal of Physics - Volume 54, Issue 2, April 2016, Pages 244-255
نویسندگان
G.P. Singh, Binaya K. Bishi, P.K. Sahoo,