Café com Física

Gargantuan chaotic gravitational three-body systems and their irreversibility to the Planck length

by Dr Tjarda Boekholt (Rudolf Peierls Centre for Theoretical Physics, University of Oxford )

Sala de Conferências (Departamento de Física FCTUC)

Sala de Conferências

Departamento de Física FCTUC

Universidade de Coimbra

Chaos is present in most stellar dynamical systems and manifests itself through the exponential growth of small perturbations.
We perform an ensemble of three-body experiments, and measure the rate of exponential divergence. We find that five percent of triple black holes with zero angular momentum can magnify an initial perturbation smaller than the Planck length to macroscopic sizes within their lifetime. This renders these triples fundamentally unpredictable, warranting a statistical approach.
We investigate the statistical reliability of N-body experiments, e.g. the individual outcomes have numerically diverged, but the statistical distributions of for example binary separation and escaper speeds are nevertheless robust, a phenomenon we call "Nagh-Hoch".


Organized by

Filipe Veloso e Pedro Costa