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The recent inference of a 70M_sun black hole (BH) in the Galactic, detachedbinary LB-1 has sparked cross-disciplinary debate since a stellar remnant ofsuch large mass is well above what can be expected from stellar-evolutionarytheory, especially in an enriched environment like that of the Milky Way. Thisstudy focusses on the possibilities of formation of extraordinarily massive BHsat solar and globular cluster (GC)-like metallicities via evolution of massivestellar binaries. A population-synthesis approach is followed utilizing therecently updated BSE program. BHs in the mass range of 50M_sun-80M_sun could beformed at the solar metallicity only if a large fraction, >70%, of matter isallowed to accrete onto a low-mass BH, in a BH-star merger product (a "blackhole Thorne-Zytkow object"; BH-TZO). Their counterparts at GC-likemetallicities can reach 100 M_sun. Although post-accretion BHs can, generally,be expected to be of high spin parameter, they can potentially be of low spinin the case of a BH-TZO. This spin aspect remains speculative in this work anddeserves detailed hydrodynamic studies.

On the formation of exotic, massive, stellar-remnant black holes at solar and sub-solar metallicities through evolution of massive binaries