Null Energy Condition and Dark Energy Models

Details Null Energy Condition and Dark Energy Models Null Energy Condition and Dark Energy Models

2007-09-30

arxiv.org/abs/0710.0115v1

Mod.Phys.Lett.A23:2787-2798,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages, 6 figures

Scientific paper

10.1142/S0217732308026194

Null Energy Condition (NEC) requires the equation of state (EoS) of the universe $w_u$ satisfy $w_u\geq-1$, which implies, for instance in a universe with matter and dark energy dominating $w_u=w_m\Omega_m+w_{de}\Omega_{de}=w_{de}\Omega_{de}\geq-1$. In this paper we study constraints on the dark energy models from the requirement of the NEC. We will show that with $\Omega_{de}\sim0.7$, $w_{de}<-1$ at present epoch is possible. However, NEC excludes the possibility of $w_{de}<-1$ forever as happened in the Phantom model, but if $w_{de}<-1$ stays for a short period of time as predicted in the Quintom theory NEC can be satisfied. We take three examples of Quintom models of dark energy, namely the phenomenological EoS, the two-scalar-field model and the single scalar model with a modified Dirac-Born-Infeld (DBI) lagrangian to show how this happens.

Affiliated with

Also associated with

No associations

Rating

Null Energy Condition and Dark Energy Models does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Null Energy Condition and Dark Energy Models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Null Energy Condition and Dark Energy Models will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-721634