Enhancement of disoriented chiral condensate domains with friction

TL;DR

This paper studies how friction influences the formation of disoriented chiral condensate domains, finding that friction can extend instability growth and enable larger domains in specific events.

Contribution

It introduces the effect of friction into the linear sigma model to analyze its impact on DCC domain formation, revealing potential for larger domains with friction.

Findings

Friction increases the time scale for instability growth.

Large DCC domains can form in some events with friction.

Domain formation remains rare overall, but possible in specific cases.

Abstract

We investigate the effect of friction on domain formation in disoriented chiral condensate. Including a friction term, we solve the equation of motion of the linear sigma model fields, in the Hartree approximation. With boost-invariance and cylinderical symmetry, irrespective of friction, on average, we donot find any indication of domain like formation with quenched initial condition. However, with or without friction, some events can be found with large instabilities, indicating possible DCC domain formation in those events. With friction time scale during which instabilities grows increases. Correspondingly, with friction, it is possible to obtain large sized domains in some particular events.