A simple ghost free and caustic free mimetic scalar field dark matter model

TL;DR

This paper introduces a simple scalar field dark matter model that is free from ghost and caustic instabilities, potentially outperforming the standard $ ext{Lambda}$CDM model.

Contribution

It presents a novel, minimal extension of mimetic dark matter that eliminates key instabilities, enhancing its viability as an alternative to $ ext{Lambda}$CDM.

Findings

Model is ghost free and caustic free

Potential to challenge or surpass $ ext{Lambda}$CDM

Provides a stable scalar field dark matter candidate

Abstract

Chamseddine and Mukhanov have promoted the concept of mimetic dark matter as alternative dark matter candidate coming from gravitation. Unfortunately although being very interesting, their proposition turned out to have weakness among which ghost and caustic instabilities. In this paper I propose among the simplest ghost free and caustic free scalar field dark matter extension of their model; a proposition capable of challenging $\Lambda$CDM model or even capable of doing better.