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This summary is machine-generated.

Black holes experience mass inflation, a rapid energy buildup, even without Cauchy horizons. This phenomenon occurs in dynamical spacetimes and suggests these black hole types are transient, not endpoints of collapse.

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Area of Science:

  • General Relativity
  • Black Hole Physics
  • Cosmology

Background:

  • Mass inflation is a known instability linked to Cauchy horizons in stationary black holes.
  • This instability causes a divergent exponential energy buildup.

Purpose of the Study:

  • To investigate mass inflation in dynamical black hole geometries.
  • To explore the presence of energy buildup in the absence of Cauchy horizons.

Main Methods:

  • Analysis of adiabatic conditions for accreting black holes with evolving inner trapping horizons.
  • Evaluation of energy buildup in dynamical spacetimes.

Main Results:

  • Finite, large exponential energy buildups occur in dynamical black hole geometries.
  • Mass inflation is present even without Cauchy horizons, under physically reasonable accretion conditions.
  • Noneternal mass inflation does not require global spacetime concepts.

Conclusions:

  • Black hole geometries with nonextremal inner horizons are dynamical transients, not endpoints of gravitational collapse.
  • This includes Kerr black holes and regular black holes beyond general relativity.