Stringy bounces and gradient instabilities

Giovannini, Massimo

doi:10.1103/PhysRevD.95.083506

Stringy bounces and gradient instabilities

Massimo Giovannini
(
- CERN and
- INFN, Milan Bicocca
)

Dec 1, 2016

14 pages

Published in:

Phys.Rev.D 95 (2017) 8, 083506

Published: Apr 7, 2017

e-Print:

1612.00346 [hep-th]

DOI:

10.1103/PhysRevD.95.083506

Report number:

CERN-TH-2016-194

View in:

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Abstract: (APS)

Bouncing solutions are obtained from a generally covariant action characterized by a potential which is a nonlocal functional of the dilaton field at two separated space-time points. Gradient instabilities are shown to arise in this context but they are argued to be nongeneric. After performing a gauge-invariant and a frame-invariant derivation of the evolution equations of the fluctuations, a heuristic criterion for the avoidance of pathological instabilities is proposed and corroborated by a number of explicit examples that turn out to be compatible with a quasiflat spectrum of curvature inhomogeneities for large wavelengths.

Note:

25 pages; comments added and corrected typos; to appear in Phys. Rev. D

invariance: gauge
stability
evolution equation
fluctuation
space-time
covariance
curvature
nonlocal
dilaton
string

References(86)

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