Phantom-Like Behavior in Modified Teleparallel Gravity. (20th March 2019)

• Record Type: Journal Article
• Authors: Karimzadeh, Sakineh; Shojaee, Raheleh
• Other Names: Vagnozzi Sunny Academic Editor.
• Is Part Of: Advances in high energy physics. Volume 2019(2019)
• Publication Date: 2019-03-20
• Subjects: Particles (Nuclear physics) -- Periodicals; Particles (Nuclear physics); Periodicals; 539.76
• DOI: 10.1155/2019/4026856
• Languages: English
• ISSNs: 1687-7357

Abstract

Abstract : The recent data from Planck2018 shows that the equation of state parameter of effective cosmic fluid today isw 0 = - 1.03 ± 0.03 . This indicates that it is possible for the universe to be in a phantom dominated era today. While a phantom field is essentially capable of explaining this observation, it suffers from some serious problems such as instabilities and violation of the null energy condition. So, it would be interesting to realize this effective phantom behavior without adopting a phantom field. In this paper, we study possible realization of an effective phantom behavior in modified teleparallel gravity. We show that modified teleparallel gravity is able essentially to realize an effective phantom-like behavior in the absence of a phantom field. For this purpose, we choose some observationally viablef ( T ) functions and prove that there are some subspaces of the models parameter space capable of realizing a phantom-like behavior without adopting a phantom field.