Abstract
view Abstract Citations (41) References (22) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Evolution of Scalar Field Cosmological Perturbations Hwang, Jai-Chan Abstract A method of dealing with cosmological perturbations was suggested recently which allows a simple way of choosing the gauge appropiate to each separate problem. Using this method, if we have one solution in a particular gauge we can easily derive the rest of the solutions in all the other gauges. In this paper we apply the method to a medium dominated by a minimally coupled scalar field. By considering full metric perturbations we are doing scalar field quantum field theory in a spatially flat homogeneous and isotropic background spacetime, now including the metric perturbations as additonal quantum fields consistently excited from the scalar field perturbations. Asymptotic solutions in a general potential case, and the exact solutions in an exponential potential case -- thus a power-law expanding background case -- are presented in tabular forms. Perturbations in de Sitter space -- thus an exact exponentially expanding background case -- need a separate treatment which is also presented. It is interesting to note that it is in the case that takes into account the full metric perturbations which allows more self-consistent analysis, compared to the one based on pure background metric. We identify the uniform-curvature gauge as providing the simple analysis in the scalar field perturbations. The full solutions may provide a wider perspective on the subject. Publication: The Astrophysical Journal Pub Date: June 1994 DOI: 10.1086/174166 Bibcode: 1994ApJ...427..542H Keywords: Astrophysics; Cosmology; Field Theory (Physics); Gauge Theory; Perturbation; Perturbation Theory; Universe; Curvature; Expansion; Inflating; Newton Theory; Quantum Theory; Astrophysics; COSMOLOGY: LARGE-SCALE STRUCTURE OF UNIVERSE; COSMOLOGY: EARLY UNIVERSE; COSMOLOGY: THEORY full text sources ADS |
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