Primordial perturbations in Einstein-Aether and BPSH theories

Journal Article · Thu Jul 01 04:00:00 EDT 2010 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2010/07/010· OSTI ID:22272782

Armendariz-Picon, Cristian ^[1]; Sierra, Noela Fariña; Garriga, Jaume ^[2]

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1. Department of Physics, Syracuse University, Syracuse, NY 13244-1130 (United States)
2. Departament de Física Fonamental i Institut de Ciències del Cosmos, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona (Spain)

We study the primordial perturbations generated during a stage of single-field inflation in Einstein-aether theories. Quantum fluctuations of the inflaton and aether fields seed long wavelength adiabatic and isocurvature scalar perturbations, as well as transverse vector perturbations. Geometrically, the isocurvature mode is the potential for the velocity field of the aether with respect to matter. For a certain range of parameters, this mode may lead to a sizable random velocity of the aether within the observable universe. The adiabatic mode corresponds to curvature perturbations of co-moving slices (where matter is at rest). In contrast with the standard case, it has a non-vanishing anisotropic stress on large scales. Scalar and vector perturbations may leave significant imprints on the cosmic microwave background. We calculate their primordial spectra, analyze their contributions to the temperature anisotropies, and formulate some of the phenomenological constraints that follow from observations. These may be used to further tighten the existing limits on the parameters for this class of theories. The results for the scalar sector also apply to the extension of Hořava gravity recently proposed by Blas, Pujolàs and Sibiryakov.

• OSTI ID: 22272782
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 07 Vol. 2010; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ANISOTROPY
COSMOLOGY
DISTURBANCES
FLUCTUATIONS
GRAVITATION
INFLATIONARY UNIVERSE
INFLATONS
LIMITING VALUES
POTENTIALS
RANDOMNESS
RELICT RADIATION
SCALARS
STRESSES
UNIVERSE
VECTORS
VELOCITY