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Fuzzball Shadows: Emergent Horizons from Microstructure

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arxiv 2103.12075 v2 pith:VBNFU25F submitted 2021-03-22 hep-th astro-ph.HEgr-qchep-ph

Fuzzball Shadows: Emergent Horizons from Microstructure

Fabio Bacchini , Daniel R. Mayerson , Bart Ripperda , Jordy Davelaar , H\'ector Olivares , Thomas Hertog , Bert Vercnocke This is my paper
classification hep-th astro-ph.HEgr-qchep-ph
keywords blackfuzzballfuzzballshorizonlimitmicrostructurenearscaling
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study the physical properties of four-dimensional, string-theoretical, horizonless "fuzzball" geometries by imaging their shadows. Their microstructure traps light rays straying near the would-be horizon on long-lived, highly redshifted chaotic orbits. In fuzzballs sufficiently near the scaling limit this creates a shadow much like that of a black hole, while avoiding the paradoxes associated with an event horizon. Observations of the shadow size and residual glow can potentially discriminate between fuzzballs away from the scaling limit and alternative models of black compact objects.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Distorting Kerr Images with Parity-Odd Scalar Hair

    gr-qc 2026-05 unverdicted novelty 5.0

    Numerical study of thin accretion disk images shows that increasing parity-odd scalar hair on Kerr black holes shrinks and distorts the photon ring and shadow, producing multiple disconnected shadows and chaotic lensi...

  2. Macroscopic Optical Nonreciprocity: A Black Hole as an Optical Diode

    gr-qc 2026-04 unverdicted novelty 5.0

    Rotating black holes with a nonminimally coupled Lorentz-violating background act as optical diodes by producing direction-dependent shadows that morph from quasi-symmetric to teardrop upon path reversal.

  3. Probing Kerr Symmetry Breaking with LISA Extreme-Mass-Ratio Inspirals

    gr-qc 2026-04 unverdicted novelty 5.0

    LISA EMRIs can constrain deviations from Kerr equatorial symmetry to 10^{-2} and axial symmetry to 10^{-3} using Analytic Kludge waveforms and Fisher analysis.

  4. Are Black Holes Fuzzballs? Probing Horizon-Scale Structure with LISA

    hep-th 2026-04 unverdicted novelty 5.0

    LISA can constrain non-axisymmetric mass quadrupole deformations at the 10^{-3} level and axisymmetric mass octupole deformations at the 10^{-2} level in EMRI signals to test fuzzball proposals.

  5. Shadow signatures and energy accumulation in Lorentzian-Euclidean black holes

    gr-qc 2026-01 unverdicted novelty 5.0

    Lorentzian-Euclidean black holes produce excess inner-shadow intensity and accumulate energy at the horizon with backreaction unlike stable light rings.