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Quintessence with O ( N ) symmetry

2002; IOP Publishing; Volume: 19; Issue: 23 Linguagem: Inglês

10.1088/0264-9381/19/23/311

1361-6382

Xin-Zhou Li, Jiangang Hao, Dao-Jun Liu,

Noncommutative and Quantum Gravity Theories

We study a new class of quintessence models, in which the scalar field possesses an O(N) internal symmetry. We give a critical condition of instability for the potential against Q ball formation. We find that the most widely used potentials of quintessence do not satisfy the above condition, and therefore, the O(N) quintessence with these potentials will not lead to Q ball formation. It is worth noting that the O(N) quintessence with a cosine-type potential is especially interesting in that the angular contribution is not negligible.