Trans-Planckian wimpzillas

TL;DR

This paper proposes a new mechanism for producing ultra-heavy dark matter particles, called wimpzillas, via trans-Planckian particle creation during inflation, which significantly enhances their production and constrains their role as dark matter.

Contribution

It combines two conjectures to introduce a novel scenario for wimpzilla production, showing enhanced creation rates and implications for dark matter.

Findings

Enhanced production of wimpzillas compared to previous models

Trans-Planckian creation parameter must be small to avoid overproduction

Wimpzillas can account for dark matter under certain conditions

Abstract

Two previously proposed conjectures--gravitational trans-Planckian particle creation in the expanding universe, and the existence of ultra-heavy stable particles with masses up to the Planck scale (wimpzillas)--are combined in a proposal for trans-Planckian particle creation of wimpzillas. This new scenario leads to a huge enhancement in their production compared to mechanisms put forward earlier. As a result, it requires the trans-Planckian particle creation parameter to be rather small to avoid overproduction of such particles, much less than that is required for observable effects in the primordial perturbation spectrum. This ensures also that wimpzillas are mainly created at the end of primordial inflation. Conditions under which trans-Planckian wimpzillas can constitute the present dark matter are determined.