Can quarks always be confined by a linear potential?

Foundations of Physics 15 (2):155-159 (1985)
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Abstract

It is demonstrated on the basis of the Dirac equation that quarks cannot be confined by a vector gluon potential of the form(r/r 0)a or[ln(r/r 0]a, a>0, if the quark-gluon interaction conserves parity. In order to confine quarks with the parity-conserving interaction, the effective gluon potential must be a pseudovector or a scalar. These are shown in a simple Yang-Mills field with theSU(2) group

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The principles of quantum mechanics.Paul Dirac - 1930 - Oxford,: Clarendon Press.

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