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arxiv hep-th/0206112 v2 pith:XTXGCQEH submitted 2002-06-13 hep-th

Fabio Finelli (IASF/CNR , Bologna) This is my paper · ORCID
classification hep-th
keywords modelexponentialgeneratedinvariantperturbationsscalespectrumanalytically
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We consider the dynamics of a contracting universe ruled by two minimally coupled scalar fields with general exponential potentials. This model describes string-inspired scenarios in the Einstein frame. Both background and perturbations can be solved analytically in this model. Curvature perturbations are generated with a scale invariant spectrum only for a dust-like collapse, as happens for a single field model with an exponential potential. We find the conditions for which a scale invariant spectrum for isocurvature perturbation is generated.

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  1. Fully viable DHOST bounce with extra scalar

    hep-th 2025-01 conditional novelty 6.0 of 10

    A constructed two-field DHOST bouncing cosmology that avoids ghost, gradient, and superluminality problems and produces nearly scale-invariant curvature perturbations.

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