Colóquio: "Dynamics of thin-shells in AdS, critical behavior and chaos" - Jorge Rocha - Institute of Cosmos Sciences - University of Barcelona

mai
24
mai/24 16:00
Sala Andre Swieca
Departamento de Física
UFSCar
Quando: 
terça-feira, 24 Maio, 2016 - 16:00
Onde: 
Sala Andre Swieca
Departamento de Física
UFSCar

I will present  a study of  gravitational collapse in  confined spaces employing the simplest two-body setting: a system composed of two thin shells  in  spherical  symmetry.  This  double-shell  model   exhibits critical behavior and chaotic dynamics, both of which are  reminiscent of  the turbulent  instability of  anti-de Sitter  spacetime recently observed  in  the evolution  of  massless scalar  fields.  The problem amounts to solving just two decoupled ODEs but it captures highly  non-trivial  dynamics: depending  on initial  data, one  observes prompt collapse,   perpetual  oscillations   or  black   hole  formation   on arbitrarily  long  timescales.  Finally,  I  will  discuss  how   this extremely simple shell model heuristically supports the idea that  the cascade  of  energies  to  shorter  length  scales  is  the  mechanism responsible for black hole formation after multiple bounces.