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It has been recently suggested that supermassive black holes at z = 5-6 mightform from super-fast (\dot M > 10^4 Msun/yr) accretion occurring in unstable,massive nuclear gas disks produced by mergers of Milky-Way size galaxies.Interestingly, such mechanism is claimed to work also for gas enriched to solarmetallicity. These results are based on an idealized polytropic equation ofstate assumption, essentially preventing the gas from cooling. We show thatunder more realistic conditions, the disk rapidly (< 1 yr) cools, the accretionrate drops, and the central core can grow only to \approx 100 Msun. Inaddition, most of the disk becomes gravitationally unstable in about 100 yr,further quenching the accretion. We conclude that this scenario encounters anumber of difficulties that possibly make it untenable.

Can supermassive black hole seeds form in galaxy mergers?