Perturbation spectrum in the inflationary stage when a cosmic string is present

Details Perturbation spectrum in the inflationary stage when a cosmic string is present Perturbation spectrum in the inflationary stage when a cosmic string is present

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ap.....53..434s&link_type=abstract

Astrophysics, Volume 53, Issue 3, pp.434-445

Astronomy and Astrophysics

Astrophysics

Cosmology, Inflation, Cosmic String

Scientific paper

We examine the spectrum of perturbations for a scalar field with an arbitrary curvature coupling parameter in the de Sitter stage of cosmological expansion when a cosmic string is present. These perturbations are caused by vacuum fluctuations in the field and serve as seed perturbations for the formation of galaxies in the postinflationary stage. A cosmic string disrupts the homogeneity of a de Sitter space, so that the spectrum of the perturbations depends on the distance from the string. This dependence is oscillatory in character with a period on the order of the perturbation wavelength.

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