INFLATION, DEFLATION, AND FRAME-INDEPENDENCE IN STRING COSMOLOGY

1993/09/03 by M. Gasperini, M Gasperini, G. Veneziano +1 · 6 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Relativity and Gravitational Theory #astro-ph #gr-qc #hep-th

paper · pdf · doi:10.1142/s0217732393003433

published as Mod.Phys.Lett. A8 (1993) 3701-3714 · 14 pages, CERN-TH.6955/93

arxiv created 1993/09/03 · openalex publication_date 1993/12/21 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The inflationary scenarios suggested by the duality properties of string cosmology in the Brans-Dicke (or string) frame are shown to correspond to accelerated contraction (deflation) when Weyl transformed to the Einstein frame. We point out that the basic virtues of inflation (solving the flatness and horizon problems, amplifying vacuum fluctuations, etc.) have physically equivalent counterparts in the deflationary (Einstein-frame) picture. This could be the answer to some objections recently raised to superstring cosmology.

Cited by

• Graceful exit and energy conditions in string cosmology
• Dilaton cosmology, noncommutativity, and generalized uncertainty principle
• Kasner asymptotics of mixmaster Hořava-Witten and pre-big-bang cosmologies
• Duality invariance of cosmological perturbation spectra
• Early cosmology and the stochastic gravitational wave background
• Spontaneous creation of the Universe Ex Nihilo