Multi-field inflation from holography

Journal Article · Thu Jan 01 00:00:00 EST 2015 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2015/01/028· OSTI ID:22382019

Garriga, Jaume; Urakawa, Yuko ^[1]; Skenderis, Kostas ^[2]

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1. Departament de Física Fonamental i Institut de Ciències del Cosmos, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona (Spain)
2. STAG Research Centre and Mathematical Sciences, University of Southampton, Southampton SO17 1BJ (United Kingdom)

We initiate the study of multi-field inflation using holography. Bulk light scalar fields correspond to nearly marginal operators in the boundary theory and the dual quantum field theory is a deformation of a CFT by such operators. We compute the power spectra of adiabatic and entropy perturbations in a simple model and find that the adiabatic curvature perturbation is not conserved in the presence of entropy perturbations but becomes conserved when the entropy perturbations are set to zero or the model is effectively a single scalar model, in agreement with expectations from cosmological perturbation theory.

• OSTI ID: 22382019
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2015, Issue 01; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COSMOLOGICAL INFLATION
DEFORMATION
ENTROPY
HOLOGRAPHIC PRINCIPLE
PERTURBATION THEORY
QUANTUM FIELD THEORY
SCALAR FIELDS
SCALARS
SPECTRA