Evolution of perturbation and power spectrum in a two-component ultralight axionic universe

TL;DR

This paper investigates how cosmic perturbations evolve in a universe with two ultralight axion components, providing the first spectral computation for such multi-component systems and exploring implications for early galaxy formation.

Contribution

It presents the first spectral computation of perturbations in multi-component ultralight axion universes, including velocity information for initial condition setups.

Findings

Potential formation of high-redshift massive galaxies.

Spectral computation of perturbations in multi-component universes.

Velocity information for axion components aids future simulations.

Abstract

The evolution of cosmic perturbations in a two-component ultralight axionic universe is investigated. We present the first spectral computation of perturbations in multi-component universes. A particular case composed of light extreme axions and free massive particles offers a possibility for the formation of very high-redshift massive galaxies, which are typically required to host massive early quasars. Our computation retains the information of perturbed velocities for individual axion components, opening a new avenue for setting up initial conditions for future axion dark matter simulations.