2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/214636The covariant canonical method of quantization based on the De Donder-Weyl covariant canonical formalism is used to formulate a world-sheet covariant quantization of bosonic strings. To provide the consistency with the standard non-covariant canonical quantization, it is necessary to adopt a Bohmian deterministic hidden-variable equation of motion. In this way, string theory suggests a solution to the problem of measurement in quantum mechanics.9 pages, version to appear in Eur. Phys. J. CHigh Energy Physics - TheoryQuantum Physicstext