Stability of the Universe Model Coupled with Phantom and Tachyon Fields

Table 1

Phase Space Analysis for the Phantom Coupled System with .

Ranges of and for Critical Points	Stability			Acceleration
,	Stable	-6.41	-1.87	Yes
,	Stable	-3.38	-0.73	Yes
,	Unstable	-1.18	-0.003	Yes
,	Saddle	-3.92	-4.27	Yes
,	Stable	1.301	1.096	No
,	Stable	-1.67	-1.23	Yes
,	Unstable	-1.69	-1.84	Yes
,	Unstable	1.3	6.8	No
,	Saddle	2.85	61.76	No
,	Saddle	-2.306	-1.383	Yes
,	Saddle	-11.57	-5.56	Yes
,	Stable	2.16	46.25	No
,	Stable	1.11	0.72	No
,	Saddle	-301.77	-2.49	Yes
,	Saddle	-194.81	-6.54	Yes
,	Saddle	1.42	8.003	No