The string-cloud parameter α in Kerr-Bertotti-Robinson spacetimes pushes the ISCO outward, raises accretion efficiency above 0.25, fits microquasar QPO data for α < 0.13, and sustains shock instabilities in GR hydrodynamical accretion.
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Astrophysical signatures of Kerr-Bertotti-Robinson black holes in a cloud of strings: ISCO, microquasar QPOs, and Bondi-Hoyle-Lyttleton accretion
The string-cloud parameter α in Kerr-Bertotti-Robinson spacetimes pushes the ISCO outward, raises accretion efficiency above 0.25, fits microquasar QPO data for α < 0.13, and sustains shock instabilities in GR hydrodynamical accretion.