Dark Energy Models in f(R, T) Theory with Variable Deceleration Parameter

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• 作者：R. K. Mishra ; Avtar Chand ; Anirudh Pradhan
• 关键词：Bianchi type ; II space ; time ; f(R ; T) gravity theory ; Dark energy ; Variable deceleration parameter ; EoS parameter
• 刊名：International Journal of Theoretical Physics
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：55
• 期：2
• 页码：1241-1256
• 全文大小：730 KB
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• 作者单位：R. K. Mishra (1)
  Avtar Chand (1)
  Anirudh Pradhan (2)
  
  1. Department of Mathematics, Sant Longowal Institute of Engineering and Technology, Longowal, 148 106, Punjab, India
  2. Department of Mathematics, Institute of Applied Sciences and Humanities, G. L. A. University, Mathura, 281 406, Uttar Pradesh, India
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Physics
  Quantum Physics
  Elementary Particles and Quantum Field Theory
  Mathematical and Computational Physics
  
• 出版者：Springer Netherlands
• ISSN：1572-9575

文摘

In this communication we have investigated Bianchi type-II dark energy (DE) cosmological models with and without presence of magnetic field in modified f(R, T) gravity theory as proposed by Harko et al. (Phys. Rev. D, 84, 024020, 2011). The exact solution of the field equations is obtained by setting the deceleration parameter q as a time function along with suitable assumption the scale factor \(a(t)= [sinh(\alpha t)]^{\frac {1}{n}}\), α and n are positive constant. We have obtained a class of accelerating and decelerating DE cosmological models for different values of n and α. The present study believes that the mysterious dark energy is the main responsible force for accelerating expansion of the universe. For our constructed models the DE candidates cosmological constant (Λ) and the EoS parameter (ω) both are found to be time varying quantities. The cosmological constant Λ is very large at early time and approaches to a small positive value at late time whereas the EoS parameters is found small negative at present time. Physical and kinematical properties of the models are discussed with the help of pictorial representations of the parameters. We have observed that our constructed models are compatible with recent cosmological observations.