Are topological vacua of QCD Lorentz invariant?
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Topological vacuum" is not a technical term with a precise meaning (that I would know). Are you talking about the vacua associated to instantons? As topological objects, how could boosts possibly act non-trivially on them (i.e. what's the quantitiy associated to them that is not a Lorentz scalar
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Instantons seems to be truely invariant objects. But topological vacua are defined in an obviously noivariant way: in the temporal gauge and on the surface of constant time. Both conditions violate Lorentz invariance.
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