Evolution of Primordial Dark Matter Planets in the Early Universe

TL;DR

This paper explores the evolution of primordial dark matter planets, focusing on their growth, nuclear reactions, and explosive ejections, which could produce observable signals in the early universe.

Contribution

It introduces a model for the evolution and explosive behavior of primordial dark matter planets, highlighting potential observational signatures.

Findings

DM objects accrete matter and undergo nuclear reactions

Heavier DM objects can eject matter explosively

Ejection timescales are shorter than neutron star bursts

Abstract

In a recent paper we had discussed possibility of DM at high redshifts forming primordial planets composed entirely of DM to be one of the reasons for not detecting DM (as the flux of ambient DM particles would be consequently reduced). In this paper we discuss the evolution of these DM objects as the Universe expands. As Universe expands there will be accretion of DM, helium and hydrogen layers (discussed in detail) on these objects. As they accumulate more and more mass, the layers get heated up leading to nuclear reactions which burn H and He when a critical thickness is reached. In the case of heavier masses of these DM objects, matter can be ejected explosively. It is found that the time scale of ejection is smaller than those from other compact objects like neutron stars (that lead to x-ray bursts). These flashes of energy could be a possible observational signature for these dense DM objects.