Multi-field oscillons/I-balls in the Friedberg-Lee-Sirlin model

TL;DR

This paper investigates multi-field oscillon solutions in the Friedberg-Lee-Sirlin model, deriving conditions analytically and confirming them numerically, revealing bound states of oscillons in multi-field systems.

Contribution

It introduces the analysis of multi-field oscillon configurations in the FLS model, extending the understanding beyond single-field oscillons.

Findings

Multi-field oscillons oscillate with frequencies set by their masses.

They form bound states due to attractive interactions between fields.

Numerical lattice calculations confirm analytical predictions.

Abstract

We study oscillon/I-ball solutions in a real scalar version of the Friedberg-Lee-Sirlin (FLS) model. Using the two-timing analysis, we derive the conditions for oscillon solutions and explore multi-field oscillon configurations. In these configurations, the two fields form co-located oscillons that oscillate with frequencies set by their respective masses. These multi-field oscillons can be viewed as a bound state of two oscillons due to attractive interactions between the fields. We confirm these analytical predictions through numerical lattice calculations. This work extends the standard picture of single-field oscillons and may be relevant for cosmological scenarios involving multiple interacting real scalar fields.