TL;DR
This paper enhances the DHOST Genesis model to naturally produce a near scale-invariant scalar power spectrum and resolves superluminality issues through specific DHOST action choices.
Contribution
It introduces modifications to the DHOST Genesis model enabling intrinsic spectrum generation and addresses superluminality problems without external mechanisms.
Findings
Successful generation of near scale-invariant spectrum within the model
Resolution of superluminality issues via specific DHOST actions
Model improvements eliminate need for external mechanisms like string gas
Abstract
We improve the DHOST Genesis proposed in \cite{Ilyas:2020zcb}, such that the near scale invariant scalar power spectrum can be generated from the model itself, without involking extra mechanism like a string gas. Besides, the superluminality problem of scalar perturbation plagued in \cite{Ilyas:2020zcb} can be rescued by choosing proper DHOST action.
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