Study on Cooling of Positronium for Bose-Einstein Condensation

TL;DR

This paper proposes a novel combined cooling method for positronium to achieve Bose-Einstein condensation, analyzing thermalization, Ps-Ps scattering, and laser cooling, and introducing a new laser system.

Contribution

It introduces an integrated cooling approach for positronium BEC, combining thermalization, Ps-Ps scattering, and laser cooling with a new laser system.

Findings

Thermalization alone is insufficient for BEC.

Ps-Ps collisions significantly affect cooling efficiency.

Combined methods enable effective cooling for BEC.

Abstract

A new method of cooling positronium down is proposed to realize Bose-Einstein condensation of positronium. We perform detail studies about three processes (1) thermalization processes between positronium and silica walls of a cavity, (2) Ps-Ps scatterings and (3) Laser cooling. The thermalization process is shown to be not sufficient for BEC. Ps-Ps collision is also shown to make a big effect on the cooling performance. We combine both methods and establish an efficient cooling for BEC. We also propose a new optical laser system for the cooling.