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Authors
Advisor(s)
Abstract(s)
The purpose of this paper is to establish possible implications of the de Broglie–Bohm interpretation of
quantum mechanics towards superstring cosmological dynamics. In this context, we investigate spatially flat
FRW models retrieved from scalar-tensor theories of gravity with a cosmological constant present in the
gravitational sector. These models are further characterized by the presence of different types of de Broglie–
Bohm quantum potential terms. These are constructed from various classes of wave packets formed by superpositions
of Bessel functions of different imaginary orders. As far as pre-big-bang scenarios are concerned, we
find that quantum potentials yield varied types of an amplified influence of the singular classical boundary into
the FRW early dynamics. Some consequences of the de Broglie–Bohm program towards pre-big-bang inflation
and the graceful exit problem are then discussed. Other cosmological scenarios are also studied by means of
modulation effects extracted from additional wave packets. We subsequently obtain a broader set of new
solutions. Among the new solutions we find that they could still be related by duality properties, although a
separation into pre- and post-big-bang classes is less clear. Some solutions show a cyclical behavior. Inflationary
solutions can be identified and some of their dynamical features are subsequently analyzed. In particular,
we discuss some of the differences between string inspired inflationary cosmologies with quantum potentials.
The results suggest that de Broglie–Bohm quantum gravitational terms slow down inflation, constituting an
effect similar to others previously described in the literature.
Description
Keywords
Quantum string cosmology
Citation
Publisher
American Physical Society