Conférences le 30/09/2019 (54m29s) L’universalité dans les phénomènes critiques : Comment parler d’explications émergentes ? / Universality in Critical Phenomena: How Can We Speak of Emergent Explanations? ... ? Quentin Rodriguez discusses the nature of standard explanations of the universality of critical phenomena: how do they differ from other physical explanations using mathematical models (ideal gas model, harmonic oscillator model)? In what way can they be... Voir la vidéo
Séminaires le 07/03/2019 (1h5m9s) Richard Montgomery - Oscillating about coplanarity in the 4 body problem ... harmonic oscillator type ODE for S along solutions. Bounds on inter-body distances then yield an explicit lower bound ω for the frequency of this oscillator, guaranteeing a degeneration within every time interval of length π/ω. The non-negativity of the... Voir la vidéo