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Inflationary buildup of a vector field condensate and its cosmological consequences

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Inflationary buildup of a vector field condensate and its cosmological consequences. / Bueno Sanchez, Juan; Dimopoulos, Konstantinos.
In: Journal of Cosmology and Astroparticle Physics, Vol. 2014, No. 1, 012, 10.01.2014.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Bueno Sanchez, J & Dimopoulos, K 2014, 'Inflationary buildup of a vector field condensate and its cosmological consequences', Journal of Cosmology and Astroparticle Physics, vol. 2014, no. 1, 012. https://doi.org/10.1088/1475-7516/2014/01/012

APA

Bueno Sanchez, J., & Dimopoulos, K. (2014). Inflationary buildup of a vector field condensate and its cosmological consequences. Journal of Cosmology and Astroparticle Physics, 2014(1), Article 012. https://doi.org/10.1088/1475-7516/2014/01/012

Vancouver

Bueno Sanchez J, Dimopoulos K. Inflationary buildup of a vector field condensate and its cosmological consequences. Journal of Cosmology and Astroparticle Physics. 2014 Jan 10;2014(1):012. doi: 10.1088/1475-7516/2014/01/012

Author

Bueno Sanchez, Juan ; Dimopoulos, Konstantinos. / Inflationary buildup of a vector field condensate and its cosmological consequences. In: Journal of Cosmology and Astroparticle Physics. 2014 ; Vol. 2014, No. 1.

Bibtex

@article{cbcee45e9cc64f37b3d5a223b49b794e,
title = "Inflationary buildup of a vector field condensate and its cosmological consequences",
abstract = "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, in the vast majority of the literature 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.",
keywords = "vector fields, Cosmic inflation, particle production, stochasic condensate",
author = "{Bueno Sanchez}, Juan and Konstantinos Dimopoulos",
note = "Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.",
year = "2014",
month = jan,
day = "10",
doi = "10.1088/1475-7516/2014/01/012",
language = "English",
volume = "2014",
journal = "Journal of Cosmology and Astroparticle Physics",
issn = "1475-7516",
publisher = "IOP Publishing",
number = "1",

}

RIS

TY - JOUR

T1 - Inflationary buildup of a vector field condensate and its cosmological consequences

AU - Bueno Sanchez, Juan

AU - Dimopoulos, Konstantinos

N1 - Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

PY - 2014/1/10

Y1 - 2014/1/10

N2 - 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, in the vast majority of the literature 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.

AB - 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, in the vast majority of the literature 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.

KW - vector fields

KW - Cosmic inflation

KW - particle production

KW - stochasic condensate

U2 - 10.1088/1475-7516/2014/01/012

DO - 10.1088/1475-7516/2014/01/012

M3 - Journal article

VL - 2014

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

IS - 1

M1 - 012

ER -