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Timelike vector field dynamics in the early universe

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Abstract

We study the dynamics of a timelike vector field when the background spacetime is in an accelerating phase in the early universe. With a timelike vector field, an inflationary phase is shown to be difficult to realize, so we investigate the evolution of a vector field within a scalar field-driven inflation model. Also, we calculate the power spectrum of the vector field without considering the metric perturbations. While the time component of the vector field perturbations provides a scale invariant spectrum when ζ = 0, where ζ is a nonminimal coupling parameter, both the longitudinal and the transverse perturbations give a scale invariant spectrum when ζ = 1/6 in the absence of the coupling terms. The deviation of the power spectrum due to the coupling terms is calculated by use of the Greens’ function.

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Authors and Affiliations

  1. Department of Science Education, Jeju National University, Jeju, 690-756, Korea

    Seoktae Koh

  2. Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100080, China

    Seoktae Koh & Bin Hu

Authors
  1. Seoktae Koh
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  2. Bin Hu
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Correspondence to Seoktae Koh.

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Koh, S., Hu, B. Timelike vector field dynamics in the early universe. Journal of the Korean Physical Society 60, 1983–1992 (2012). https://doi.org/10.3938/jkps.60.1983

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