Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2000-10-25
Phys.Rev. D63 (2001) 083504
Physics
High Energy Physics
High Energy Physics - Theory
LaTeX, 42 pages, 5 .eps figures. v2: typos corrected, references added and 2 new paragraphs in conclusions section. v3: commen
Scientific paper
10.1103/PhysRevD.63.083504
This paper investigates Starobinsky's model of inflation driven by the trace anomaly of conformally coupled matter fields. This model does not suffer from the problem of contrived initial conditions that occurs in most models of inflation driven by a scalar field. The universe can be nucleated semi-classically by a cosmological instanton that is much larger than the Planck scale provided there are sufficiently many matter fields. There are two cosmological instantons: the four sphere and a new ``double bubble'' solution. This paper considers a universe nucleated by the four sphere. The AdS/CFT correspondence is used to calculate the correlation function for scalar and tensor metric perturbations during the ensuing de Sitter phase. The analytic structure of the scalar and tensor propagators is discussed in detail. Observational constraints on the model are discussed. Quantum loops of matter fields are shown to strongly suppress short scale metric perturbations, which implies that short distance modifications of gravity would probably not be observable in the cosmic microwave background. This is probably true for any model of inflation provided there are sufficiently many matter fields. This point is illustrated by a comparison of anomaly driven inflation in four dimensions and in a Randall-Sundrum brane-world model.
Hawking Stephen W.
Hertog Thomas
Reall Harvey S.
No associations
LandOfFree
Trace anomaly driven inflation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Trace anomaly driven inflation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Trace anomaly driven inflation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-105664