Hubble slow roll expansion for multifield inflation

Journal Article · Mon Nov 14 23:00:00 EST 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.72.103505· OSTI ID:20711532

Easther, Richard ^[1]; Giblin, Jr, John T ^[2]

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1. Department of Physics, Yale University, New Haven, Connecticut 06520 (United States)
2. Department of Physics, Brown University, Providence, Rhode Island 02912 (United States)

We examine the dynamics of inflation driven by multiple, interacting scalar fields and derive a multifield version of the Hubble slow roll expansion. We show that the properties of this expansion naturally generalize those of the single field case. We present an analogous hierarchy of slow roll parameters, and derive the system of flow equations that describes their evolution, and show that when this system is truncated at finite order, it can always be solved exactly. Lastly, we express the scalar and tensor perturbation spectra in terms of the slow roll parameters.

• OSTI ID: 20711532
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 10 Vol. 72; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COSMOLOGY
EXPANSION
FLUID MECHANICS
PERTURBATION THEORY
SCALAR FIELDS
SCALARS
TENSORS