Inflation with massive vector fields

Journal Article · Sat Aug 01 00:00:00 EDT 2015 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2015/08/033· OSTI ID:22525567

Liu, Junyu ^[1]; Wang, Yi; Zhou, Siyi ^[2]

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1. University of Science and Technology of China, Hefei, Anhui, 230026 (China)
2. Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong (China)

We investigate the coupling between the inflaton and massive vector fields. All renormalizable couplings with shift symmetry of the inflaton are considered. The massive vector can be decomposed into a scalar mode and a divergence-free vector mode. We show that the former naturally interacts with the inflaton and the latter decouples at tree level. The model in general predicts f{sub NL}equil = O(1), while in some regions of the parameter space large non-Gaussianity can arise.

• OSTI ID: 22525567
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2015, Issue 08; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COSMOLOGICAL INFLATION
DECOUPLING
INFLATIONARY UNIVERSE
INFLATONS
RENORMALIZATION
SCALARS
SPACE
SYMMETRY
VECTOR FIELDS
VECTORS