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Motivation for the shape of the theta vacua

As boring as this might sound, the simple reason why $\left|\theta \right>$ is the correct vacuum for QCD is because it is an eigenstate of any Hamiltonian which verifies $$ \left<n \right| H \...
Gabriel Ybarra Marcaida's user avatar
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Is there possible isentropic phase transition?

If you are just asking about a phase transition where the entropy stays exactly the same, any quantum phase transition will have that property quite trivially, because all QPTs happen at $T=0$ by ...
Jun_Gitef17's user avatar

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