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Energy Extraction from Spinning Stringy Black Holes

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arxiv 2310.20040 v1 pith:QNJWFXBW submitted 2023-10-30 gr-qc astro-ph.GAastro-ph.HE

Koushik Chatterjee , Prashant Kocherlakota , Ziri Younsi , Ramesh Narayan This is my paper
classification gr-qcastro-ph.GAastro-ph.HE
keywords findmechanismalternateblackenergyfirstframe-draggingholes
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abstract

We perform the first numerical simulations modeling the inflow and outflow of magnetized plasma in the Kerr-Sen spacetime, which describes classical spinning black holes (BHs) in string theory. We find that the Blandford-Znajek (BZ) mechanism, which is believed to power astrophysical relativistic outflows or ``jets'', is valid even for BHs in an alternate theory of gravity, including near the extremal limit. The BZ mechanism releases outward Poynting-flux-dominated plasma as frame-dragging forces magnetic field lines to twist. However, for nonspinning BHs, where the frame-dragging is absent, we find an alternate powering mechanism through the release of gravitational potential energy during accretion. Outflows from non-spinning stringy BHs can be approximately $250\%$ more powerful as compared to Schwarzschild BHs, due to their relatively smaller event horizon sizes and, thus, higher curvatures. Finally, by constructing the first synthetic images of near-extremal non-Kerr BHs from time-dependent simulations, we find that these can be ruled out by horizon-scale interferometric images of accreting supermassive BHs.

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Cited by 4 Pith papers

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

  1. Viscosity effects on the shadow of a non-rotating black hole

    gr-qc 2026-07 conditional novelty 5.0 of 10

    Shear viscosity and spacetime-curvature transport alter synthetic black hole shadow images of stationary magnetized tori at the few-μJy level.

  2. Observational distinguishability of the Kerr and Kerr-Hayward metrics to EHT

    astro-ph.HE 2026-04 unverdicted novelty 5.0 of 10

    Simulations show the singularity-free Kerr-Hayward metric yields EHT observables that are functionally indistinguishable from the Kerr metric.

  3. Observational distinguishability of the Kerr and Kerr-Hayward metrics to EHT

    astro-ph.HE 2026-04 conditional novelty 5.0 of 10

    Under fixed-background GRMHD and polarized radiative transfer, modified Kerr-Hayward black holes produce EHT fluid and image observables functionally indistinguishable from Kerr.

  4. Polarization Signatures from GRMHD Simulations of Black Hole Accretion

    astro-ph.HE 2026-05 unverdicted novelty 2.0 of 10

    Polarization signatures from GRMHD simulations of black hole accretion can help probe disk, corona, and jet properties when combined with X-ray polarimetry observations.

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