Cedric Deffayet (Paris): Ghosts without runaway instabilities

Mittwoch, 19 Februar 2025 14:15

Ort: Viktor-Franz-Hess-Hörsaal, Währinger Straße 17, 1. Stock Kavalierstrakt

I will discuss simple mechanical models with a ghost (i.e. a mode with a negative kinetic energy) interacting with a positive energy degree of freedom, and yet, the phase-space motion can be shown analytically and numerically to be fully stable thanks to integrability. Extensions to field theories will also be discussed.