Abstract:
We consider the problem of describing the possible spectra of an acoustic
operator with a periodic finite-gap density. On the moduli space of algebraic
Riemann surfaces, we construct flows that preserve the periods of the corresponding operator. By a suitable extension of the phase space, these
equations can be written with quadratic irrationalities.
Citation:
D. V. Zakharov, “Isoperiodic deformations of the acoustic operator and periodic solutions of the Harry Dym equation”, TMF, 153:1 (2007), 46–57; Theoret. and Math. Phys., 153:1 (2007), 1388–1397