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Fuzzball Shadows: Emergent Horizons from Microstructure.

Fabio Bacchini1, Daniel R Mayerson2, Bart Ripperda3

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String theory fuzzballs create black hole-like shadows without event horizons. Imaging these shadows and their glow could distinguish fuzzballs from other compact objects.

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Area of Science:

  • Theoretical physics
  • String theory
  • Quantum gravity

Background:

  • Black holes are described by event horizons, leading to information paradoxes.
  • Fuzzball geometries are string-theory-based, horizonless microstate solutions.
  • Previous studies lack observational signatures to differentiate fuzzballs from black holes.

Purpose of the Study:

  • To investigate the physical properties of four-dimensional, horizonless fuzzball geometries.
  • To determine if fuzzball shadows can mimic black hole shadows.
  • To identify observational methods for distinguishing fuzzballs from other compact objects.

Main Methods:

  • Simulating the imaging of fuzzball "shadows" by analyzing light ray trajectories.
  • Studying the behavior of light rays near the would-be horizon of fuzzballs.
  • Analyzing the characteristics of the shadow size and residual glow.

Main Results:

  • Fuzzballs near the scaling limit produce shadows similar to black holes.
  • The microstructure of fuzzballs traps light on chaotic orbits, forming the shadow.
  • This shadow formation avoids the paradoxes associated with event horizons.

Conclusions:

  • Fuzzball geometries can present observational signatures resembling black holes.
  • Shadow imaging offers a potential method to differentiate fuzzballs from alternative compact objects.
  • Further observations of shadow size and residual glow are crucial for validating fuzzball models.