Cosmological perturbations from the no boundary Euclidean path integral - art. no. 123507

Citation
S. Gratton et N. Turok, Cosmological perturbations from the no boundary Euclidean path integral - art. no. 123507, PHYS REV D, 6012(12), 1999, pp. 3507
Citations number
29
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW D
ISSN journal
0556-2821 → ACNP
Volume
6012
Issue
12
Year of publication
1999
Database
ISI
SICI code
0556-2821(199912)6012:12<3507:CPFTNB>2.0.ZU;2-7
Abstract
We compute, from first principles, the quantum fluctuations about instanton saddle points of the Euclidean path integral for Einstein gravity coupled to a scalar held. The Euclidean two-point correlator is analytically contin ued into the Lorentzian region where it describes the quantum mechanical va cuum fluctuations in the state described by no boundary proposal initial co nditions. We concentrate on the density perturbations in open inflationary universes produced from cosmological instantons, describing the differences between non-singular Coleman-De Luccia and singular Hawbing-Turok. instant ons. We show how the Euclidean path integral uniquely specifies the fluctua tions in both cases. [S0556-2821(99)01022-X].