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The Primordial Perturbation Spectrum from Various Expanding and Contracting Phases

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arxiv astro-ph/0403671 v1 pith:ZPRC2IIF submitted 2004-03-30 astro-ph

Yun-Song Piao , Yuan-Zhong Zhang This is my paper · ORCID
classification astro-ph
keywords phasesprimordialperturbationspectrumvariouscontractingexpandingbuilding
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In this paper, focusing on the case of single scalar field, we discuss various expanding and contracting phases generating primordial perturbations, and study the relation between the primordial perturbation spectrum from these phases and the parameter w of state equation in details. Furthermore, we offer an interesting classification for the primordial perturbation spectrum from various phases, which may have important implications for building an early universe scenario embedded in possible high energy theories.

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  1. Analytic Gravitational Wave Spectrum in Next-to-Minimal Bouncing Cosmology

    astro-ph.CO 2025-07 conditional novelty 6.0 of 10

    A five-phase bouncing cosmology yields a broken power-law gravitational wave spectrum whose amplitude bound automatically keeps the bounce energy below the Planck scale.

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