Vector curvaton with varying kinetic function

Journal Article · Fri Jan 15 00:00:00 EST 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.023522· OSTI ID:21409054

Dimopoulos, Konstantinos; Karciauskas, Mindaugas; Wagstaff, Jacques M ^[1]

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1. Physics Department, Lancaster University, Lancaster LA1 4YB (United Kingdom)

A new model realization of the vector curvaton paradigm is presented and analyzed. The model consists of a single massive Abelian vector field, with a Maxwell-type kinetic term. By assuming that the kinetic function and the mass of the vector field are appropriately varying during inflation, it is shown that a scale-invariant spectrum of superhorizon perturbations can be generated. These perturbations can contribute to the curvature perturbation of the Universe. If the vector field remains light at the end of inflation it is found that it can generate substantial statistical anisotropy in the spectrum and bispectrum of the curvature perturbation. In this case the non-Gaussianity in the curvature perturbation is predominantly anisotropic, which will be a testable prediction in the near future. If, on the other hand, the vector field is heavy at the end of inflation then it is demonstrated that particle production is approximately isotropic and the vector field alone can give rise to the curvature perturbation, without directly involving any fundamental scalar field. The parameter space for both possibilities is shown to be substantial. Finally, toy models are presented which show that the desired variation of the mass and kinetic function of the vector field can be realistically obtained, without unnatural tunings, in the context of supergravity or superstrings.

• OSTI ID: 21409054
• Journal Information: Physical Review. D, Particles Fields, Vol. 81, Issue 2; Other Information: DOI: 10.1103/PhysRevD.81.023522; (c) 2010 The American Physical Society; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANISOTROPY
DISTURBANCES
FORECASTING
INFLATIONARY UNIVERSE
MASS
PARTICLE PRODUCTION
PERTURBATION THEORY
SCALAR FIELDS
SIMULATION
SPECTRA
SUPERGRAVITY
SUPERSTRING MODELS
UNIVERSE
VECTOR FIELDS
COMPOSITE MODELS
COSMOLOGICAL MODELS
EXTENDED PARTICLE MODEL
FIELD THEORIES
MATHEMATICAL MODELS
PARTICLE MODELS
QUARK MODEL
STRING MODELS
UNIFIED-FIELD THEORIES