Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-06-25
Phys.Lett. B576 (2003) 12-17
Physics
High Energy Physics
High Energy Physics - Theory
9 pages, LaTeX2e
Scientific paper
10.1016/j.physletb.2003.09.074
We present a phase-space analysis of cosmology containing multiple scalar fields with a positive or negative cross-coupling exponential potential. We show that there exist power-law kinetic-potential-scaling solutions for a sufficiently flat positive potential or for a steep negative potential. The former is the unique late-time attractor, but it is difficult to yield assisted inflation. The later is never stable in an expanding universe. Moreover, for a steep negative potential there exists a kinetic-dominated regime in which each solution is a late-time attractor. In the presence of ordinary matter these scaling solutions with a negative cross-coupling potential are found unstable. We briefly discuss the physical consequences of these results.
Cai Rong-Gen
Guo Zong-Kuan
Piao Yun-Song
Zhang Yuan-Zhong
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