Primordial perturbation with a modified dispersion relation
Yi-Fu Cai, and Xinmin Zhang
TL;DR
This paper investigates how primordial perturbations are generated under a modified dispersion relation across different cosmological backgrounds, highlighting the background's influence on the power spectrum shape.
Contribution
It demonstrates that the formation of the power spectrum with a modified dispersion relation depends critically on the cosmological background, especially in bounce models.
Findings
Red tilt spectrum obtained in a bounce model with matter-like contraction
Power spectrum formation is highly background-dependent
Modified dispersion relation influences the spectral tilt
Abstract
In this paper we study the generation of primordial perturbation with a modified dispersion relation in various cosmological evolutions. We stress that the formation of the power spectrum is strongly dependent on the background. Working in a bounce model with a matter-like contracting phase, we obtain a red tilt spectrum due to the modified dispersion relation.
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