Stability of multi-field cosmological solutions in the presence of a fluid

Details Stability of multi-field cosmological solutions in the presence of a fluid Stability of multi-field cosmological solutions in the presence of a fluid

2010-04-22

arxiv.org/abs/1004.3888v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages. Minor changes to match Phys Rev D accepted version

Scientific paper

We explore the stability properties of multi-field solutions in the presence of a perfect fluid, as appropriate to assisted quintessence scenarios. We show that the stability condition for multiple fields $\phi_i$ in identical potentials $V_i$ is simply $d^2V_i/d \phi_i^2 > 0$, exactly as in the absence of a fluid. A possible new instability associated with the fluid is shown not to arise in situations of cosmological interest.

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