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

Abstract

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 ${\varphi }_i$ in identical potentials $V_i$ is simply $d^2{V}_i/d{\varphi }_i^2>0$, 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.

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

References in corpus (4)

• Dynamics of Generalized Assisted Inflation
• Quintessence dynamics with two scalar fields and mixed kinetic terms
• Assisted dark energy
• Stability of multi-field cosmological solutions

Cited by in corpus (1)

• Effective action approach to cosmological perturbations in dark energy and modified gravity