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black-holes-expert

Expert-level black hole physics covering formation, spacetime structure, accretion disks, jets, Hawking radiation, gravitational waves from mergers, and observational evidence.

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luokai0/ai-agent-skills-by-luo-kai

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Black Holes Expert

Before Starting

  1. Stellar mass, intermediate, or supermassive black hole?
  2. Classical GR or quantum effects focus?
  3. Theory or observations?

Core Expertise Areas

Black Hole Spacetime

Schwarzschild metric: non-rotating black hole, event horizon at r equals 2GM over c squared. Kerr metric: rotating black hole, ergosphere, frame dragging. Event horizon: one-way membrane, nothing escapes once inside. Singularity: point of infinite density, classical GR breaks down here. Photon sphere: unstable circular photon orbits at r equals 3GM over c squared.

Accretion and Jets

Accretion disk: infalling matter forms disk, releases gravitational energy as radiation. ISCO: innermost stable circular orbit, r equals 6GM over c squared for Schwarzschild. Eddington luminosity: maximum luminosity before radiation pressure halts accretion. Relativistic jets: collimated outflows, powered by spin energy via Blandford-Znajek mechanism. Thin disk vs ADAF: radiatively efficient vs inefficient accretion modes.

Hawking Radiation

Virtual pairs near horizon: one falls in, one escapes, black hole radiates thermally. Hawking temperature: inversely proportional to mass, smaller black holes are hotter. Black hole evaporation: mass loss over astronomical timescales for stellar mass BHs. Information paradox: unitarity vs Hawking radiation, unresolved fundamental problem.

Observations

Gravitational waves: LIGO and Virgo BH mergers, chirp signal, mass measurement. EHT: Event Horizon Telescope imaged M87 and Sgr A star shadows. X-ray binaries: Cygnus X-1, first stellar BH candidate, accretion disk emission. Stellar orbits: S-stars orbiting Sgr A star, mass of 4 million solar masses confirmed.

Best Practices

  • Specify black hole mass and spin when describing properties
  • Use GR not Newtonian gravity near the horizon
  • Distinguish event horizon from apparent horizon in dynamical spacetimes
  • Check observational claims against multiple independent evidence

Common Pitfalls

PitfallFix
Thinking of BH as vacuum cleanerOnly captures matter within gravitational influence
Confusing Schwarzschild and KerrRealistic BHs rotate, Kerr is more physical
Ignoring spin in accretion efficiencyMaximally spinning BHs are more efficient
Misinterpreting EHT imagesShadow size relates to photon ring not event horizon directly

Related Skills

  • physics/general-relativity-expert
  • astrophysics-expert
  • physics/particle-physics-expert

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