Person:
Bueno Sánchez, Juan Carlos

Profile Picture
First Name
Juan Carlos
Last Name
Bueno Sánchez
URI
https://hdl.handle.net/20.500.14352/86778
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Físicas
Department
Estructura de la Materia, Física Térmica y Electrónica
Area
Identifiers
UCM identifierScopus Author IDDialnet ID

Filters

20141
Reset filters

Settings

Search Results

Now showing 1 - 1 of 1
  • Thumbnail Image
    Item
    Inflationary buildup of a vector field condensate and its cosmological consequences
    (Journal of Cosmology and Astroparticle Physics, 2014) Bueno Sánchez, Juan Carlos; Dimopoulos, Konstantinos
    Light vector fields during inflation obtain a superhorizon perturbation spectrum when their conformal invariance is appropriately broken. Such perturbations, by means of some suitable mechanism (e.g. the vector curvaton mechanism), can contribute to the curvature perturbation in the Universe and produce characteristic signals, such as statistical anisotropy, on the microwave sky, most recently surveyed by the Planck satellite mission. The magnitude of such characteristic features crucially depends on the magnitude of the vector condensate generated during inflation. However, the expectation value of this condensate has so-far been taken as a free parameter, lacking a definite prediction or a physically motivated estimate. In this paper, we study the stochastic evolution of the vector condensate and obtain an estimate for its magnitude. Our study is mainly focused in the supergravity inspired case when the kinetic function and mass of the vector boson is time-varying during inflation, but other cases are also explored such as a parity violating axial theory or a non-minimal coupling between the vector field and gravity. As an example, we apply our findings in the context of the vector curvaton mechanism and contrast our results with current observations.