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Covariant Two-Field Perturbations Through a Curvature-Driven Bounce in Closed FRW Cosmology
We study perturbations through a locally non-singular bounce in a closed ($K=+1$) FRW universe with a regularised two-field sigma model. Positive curvature drives the bounce in General Relativity without NEC violation; the expanding branch approaches Starobinsky inflation and yields the standard lea
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