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Hawking, Perry and Strominger recently invoked BMS symmetry charges in anattempt to resolve the black hole information paradox. Here we propose analternative scenario that is based on the Kac-Moody charges. We show that therole of BMS charges can be played by an infinite set of symmetries that emergefrom the space-time foam predicted by quantum gravity. Specifically, we focuson Yang-Mills fields embedded in the gravity described by the Holstformulation, and argue that the Yang-Mills and gravitational self-dualityconditions in space-time bubbles are related to a new infinite dimensionalglobal symmetry, hidden in the Lagrangian. Such a symmetry is manifested by theKac-Moody algebra, with zero central charges. This implies the existence, inthe space-time foam, of an infinite number of different instantons that areinterconnected by the Kac-Moody symmetry. These modes puncture the horizons ofthe building block of the space-time bubbles. On the other hand, the sameKac-Moody symmetry is retried in non-perturbative regime at the level of thegravitational quantum loops. The new result carries consequences on the no-hairtheorem and on the study of quantum black holes. In particular, instantonicmoduli of the Kac-Moody charges are quantum hairs encoding the missing blackhole information, subtly compatible with the no hair theorem.

Kac-Moody instantons in space-time foam as an alternative solution to the black hole information paradox