Abstract
We obtain the precise condition on the potentials of Yang–Mills theories in 0 + 1 dimensions and D0-brane quantum mechanics ensuring the discreteness of the spectrum. It is given in terms of a moment of inertia of the membrane. From it we obtain a bound for the mass gap of any D + 1 Yang–Mills theory in the slow-mode regime. In particular we analyze the physical case D = 3 . The quantum mechanical behavior of the theories, concerning its spectrum, is determined by harmonic oscillators with frequencies given by the inertial tensor of the membrane. We find a class of quantum mechanic potential polynomials of any degree, with classical instabilities that at quantum level have purely discrete spectrum.
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