String inspired quintom model with non-minimally coupled modified gravity

2009/03/24 by J. Sadeghi, J Sadeghi, M. R. Setare +3
Physics and Astronomy · #Black Holes and Theoretical Physics #Classical mechanics #Cosmology #Cosmology and Gravitation Theories #Dark energy #Mathematical physics #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #Scalar field #String (physics) #Theoretical physics #hep-th

paper · pdf · doi:10.1016/j.physletb.2009.06.008

8 pages, no figures

arxiv created 2009/03/24 · openalex publication_date 2009/06/11 · arxiv updated 2015/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

In this Letter we consider a quintom model of dark energy with non-minimal coupling between scalar field and modified gravity which is known f(R) gravity. The Lagrangian for scalar field has been inspired by tachyonic Lagrangian in string theory. Then we obtain the equation of state (EoS), and the condition required for the model parameters when ω crosses over −1. This model shows that for having ω across over −1, one doesn't need to add some higher derivative operator in the tachyonic part of action (the way that usually used to obtain crossing of the phantom divide line for EoS parameter).

Citations

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