Research Article

Stability of the Universe Model Coupled with Phantom and Tachyon Fields

Table 2

Phase Space Analysis for the Phantom Coupled System with .

Ranges of and for Critical PointsStabilityAcceleration


, SaddleUndetermined-2.51Yes

, , UnstableUndetermined-2.51Yes

, StableUndetermined-6.63Yes

, StableUndetermined-6.63Yes


, Saddle-37.41-2.36Yes

, , Stable2.5814No

, , Saddle1.7214No

, Unstable-1.07-2.36Yes


, Saddle-37.42-2.36Yes

, , Stable2.5814No

, , Saddle1.7214No

, Saddle-1.07-2.36Yes


, Stable-0.97-1Yes

, , Saddle-0.97-1Yes

, Saddle-0.217-1Yes

, Unstable-0.217-1Yes