Global Existence and Long Time Behavior in the 1+1 dimensional Principal Chiral Model with Applications to Solitons

PDE Seminar
Tuesday, February 7, 2023 - 3:00pm for 1 hour (actually 50 minutes)
Skiles 006
Jessica Trespalacios Julio – Universidad de Chile – jtrespalacios@dim.uchile.cl
Gong Chen

We consider the 1+1 dimensional vector valued Principal Chiral Field model (PCF) obtained as a simplification of the Vacuum Einstein Field equations under the Belinski-Zakharov symmetry. PCF is an integrable model, but a rigorous description of its evolution is far from complete. Here we provide the existence of local solutions in a suitable chosen energy space, as well as small global smooth solutions under a certain non degeneracy condition. We also construct virial functionals which provide a clear description of decay of smooth global solutions inside the light cone. Finally, some applications are presented in the case of PCF solitons, a first step towards the study of its nonlinear stability.