Physics
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989phrvd..39.2854a&link_type=abstract
Physical Review D (Particles and Fields), Volume 39, Issue 10, 15 May 1989, pp.2854-2863
Physics
78
Particle-Theory And Field-Theory Models Of The Early Universe, Origin And Formation Of The Universe
Scientific paper
We consider a recently proposed extended model of inflation which improves upon the original old inflation scenario by achieving a graceful exit from the false-vacuum phase. In this paper extended inflation is generalized to include a potential V(φ) for the Brans-Dicke-type field φ. We find that whereas a graceful exit can still be had, the inclusion of a potential places constraints on the percolation time scale for exiting the inflationary phase. Additional constraints on V(φ) and the false-vacuum energy density ρF from density and gravitational-wave perturbations are discussed. For initially small values of φ the false vacuum undergoes power-law inflation, while for initially large values of φ the expansion is exponential. Within true-vacuum regions slow-rolling inflation can occur. As a result, this model generically leads to multiple episodes of inflation. We discuss the significance these multiple episodes of inflation may have on the formation of large-scale structure and the production of voids.
Accetta Frank S.
Trester Jeffrey J.
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