Adiabatic number operators and vacua for coupled bosonic systems are constructed order by order from a linear recursion for complex structures, generalizing WKB and Lewis-Riesenfeld invariant methods beyond a single mode.
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Adiabatic vacua from linear complex structures
Adiabatic number operators and vacua for coupled bosonic systems are constructed order by order from a linear recursion for complex structures, generalizing WKB and Lewis-Riesenfeld invariant methods beyond a single mode.