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By Lindblad G.

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One inserts e following [902] to obtain (AP) ~-~r ,,- 1-IIN[1+ (aj/e)X((T/E), s ~j)]. 1 where T ,,, (tn, n > 2). 2. VERTEX OPERATORS AND COHERENT STATES 35 which can be further expanded. One is thus given various /)(A) = exp(/ka t - A a ) and the insertion of e could be thought of as a way of introducing peaked states and coadjoint orbit variables to provide a geometrical background for dispersionless KP theory. g. fluid dynamics analogous to the control of quantum fluctuations expressed via Q ~ v/-hq = eq ---.

We recall several background facts. First from the Groenwald-vanHove theorem (cf. ) in a general sense (beyond quadratic polynomials- cf. also [122]). Now what about quantized integrability? g. N commuting constants of motion In such that {H, I~} = 0. For infinite dimensional systems such as KdV one expects N ---. ec (cf. 4) for { , }1,2). Then one could anticipate that quantum integrability should involve N commuting quantum constants of motion such that [/~,/~n] = 0 and [/~n,Im] = 0. However one knows by a theorem of vonNeumann that for any number of commuting selfadjoint operators/~n there exists a selfadjoint operator 2 such that /~n = fn(Z) (recall observables correspond to selfadjoint operators).

The approach in [153, 169] exploits a connection of the Schrhdinger equation to a dispersionless KdV (dKdV) situation which goes as follows. 71) where X is the QM space variable with r ~ OCE/OX. 77) has a possible origin from a dKP type situation cx - Z with (AR)L2+ 02 - v(x, ti) with T2 = et2 and T2 = - i ~ T 2 so Or2 = COT2 = --ihOr2. 77). g. v(x, ti) ~ v ( X / e , Ti/e) + O(e). This is standard in dispersionless KP (dKP) and certainly realizable by quotients of homogeneous polynomials for example.

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Onthe Generators of Quantum Dynamical Semigroups by Lindblad G.


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