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arXiv:0711.3360 (astro-ph)
[Submitted on 21 Nov 2007 (v1), last revised 29 Nov 2007 (this version, v2)]

Title:Stability of multi-field cosmological solutions

Authors:Gianluca Calcagni, Andrew R. Liddle
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Abstract: We explore the stability properties of multi-field solutions of assisted inflation type, where several fields collectively evolve to the same configuration. In the case of noninteracting fields, we show that the condition for such solutions to be stable is less restrictive than that required for tracking in quintessence models. Our results, which do not rely on the slow-roll approximation, further indicate that to linear order in homogeneous perturbations the fields are in fact unaware of each other's existence. We end by generalizing our results to some cases of interacting fields and to other background solutions and dynamics, including the high-energy braneworld.
Comments: 6 pages; v2: typos corrected, version accepted by PRD
Subjects: Astrophysics (astro-ph); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
Cite as: arXiv:0711.3360 [astro-ph]
  (or arXiv:0711.3360v2 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0711.3360
Journal reference: Phys.Rev.D77:023522,2008
Related DOI: https://doi.org/10.1103/PhysRevD.77.023522

Submission history

From: Gianluca Calcagni [view email]
[v1] Wed, 21 Nov 2007 12:08:47 UTC (12 KB)
[v2] Thu, 29 Nov 2007 15:50:14 UTC (12 KB)
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