Abstract
An exact classical field theory, for a recently proposed nonlinear generalization of the Schrödinger equation, is presented. In this generalization, a nonlinearity depending on an index q appears in the kinetic term, such that the free-particle linear Schrödinger equation is recovered in the limit q→1. It is shown that besides the usual 
, a new field 
must be introduced, which becomes 
only when q→1. In analogy to the linear case, 
is interpreted as the probability density for finding the particle at time t, in a given position 
inside an arbitrary finite volume V, for any q. The possible physical consequences are discussed, and, in particular, the important property that the fields 
and 
do not interact with light.
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