Koh, S (reprint author), Jeju Natl Univ, Dept Sci Educ, Cheju 690756, South Korea.
部门归属:
[Koh, Seoktae] Jeju Natl Univ, Dept Sci Educ, Cheju 690756, South Korea; [Koh, Seoktae; Hu, Bin] Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
英文摘要:
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 zeta = 0, where zeta is a nonminimal coupling parameter, both the longitudinal and the transverse perturbations give a scale invariant spectrum when zeta = 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.
