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The European Physical Journal C

, 71:1748 | Cite as

Future cosmological evolution in f(R) gravity using two equations of state parameters

  • Hyung Won LeeEmail author
  • Kyoung Yee Kim
  • Yun Soo Myung
Regular Article - Theoretical Physics

Abstract

We investigate the issues of future oscillations around the phantom divide (FOPD) for f(R) gravity. For this purpose, we introduce two types of energy density and pressure arisen from the f(R)-higher order curvature terms. One has the conventional energy density and pressure even in the beginning of the Jordan frame, whose continuity equation defines the native equation of state w DE. On the other hand, the other has the different energy density and pressure which do not obviously satisfy the continuity equation. This needs to introduce the effective equation of state w eff to describe the f(R)-fluid, in addition to the native equation of state \(\tilde{w}_{\mathrm{DE}}\). We show that the FOPD occur in f(R) gravities by introducing two types of equation of state. Finally, we point out that the singularity appears ar x=x c because the stability condition of f(R) gravity violates.

Keywords

Cosmological Parameter Native Equation Cosmological Evolution Jordan Frame Phantom Divide 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag / Società Italiana di Fisica 2011

Authors and Affiliations

  • Hyung Won Lee
    • 1
    Email author
  • Kyoung Yee Kim
    • 1
  • Yun Soo Myung
    • 1
  1. 1.Institute of Basic Science and School of Computer Aided ScienceInje UniversityGimhaeKorea

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