Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas

27 | Janna Levin on Black Holes, Chaos, and the Narrative of Science

Dec 17, 2018
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INSIGHT

Invariant Chaos Around Black Holes

  • Chaos in general relativity must be defined with observer-independent structures like fractal sets in phase space.
  • Fractal dimension gives an invariant signature of chaotic behavior around black holes that all observers agree on.
INSIGHT

Fractals Encode Orbital Uncertainty

  • Fractal structures in orbital outcomes encode extreme sensitivity to initial conditions near multiple black holes.
  • The fractal dimension relates to Lyapunov exponents and yields an observer-independent measure of unpredictability.
ANECDOTE

Black Hole Circuits From Swallowed Magnets

  • Janna realized a neutron star swallowed by a black hole can create a powerful electromagnetic circuit.
  • She sketched circuit diagrams imagining the magnet whipping near light speed and powering enormous currents.
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