Summary
The connection of the Lax equation to a Poisson structure via Lie algebraic methods has been recently investigated and explicitly displayed for the Korteweg-de Vries equation by Berezin and Perelomov; a similar approach has been also discussed by Adler and by Lebedev and Manin. We have used this method to show the group-theoretic origin of certain nonlinear partial differential equations which are known to be solvable via the spectral transform associated to the generalized Zakharov-Shabat linear problem. These equations are found to be special realizations of evolution equations for time-dependent linear operators acting on an infinite-dimensional linear space. In particular an abstract form of the Korteweg-de Vries, modified Korteweg-de Vries and nonlinear Schrödinger equations is presented.
Riassunto
Recentemente è stata studiata una relazione tra l'equazione di Lax ed una struttura di Poisson mediante l'uso di algebre di Lie. Questa relazione è stata data esplicitamente per l'equazione di Korteweg-de Vries da Berezin e Perelomov. Un approccio simile è stato anche discusso da Adler e da Lebedev e Manin. In questo lavoro questo metodo è stato usato, per mostrare l'origine gruppale di alcune equazioni differenziali alle derivate parziali non lineari che sono integrabili con il metodo della trasformata spettrale associata al problema di Zakharov-Shabat. Si mostra che queste equazioni sono particolari realizzazioni di equazioni d'evoluzione per operatori lineari che operano su uno spazio lineare infinito-dimensionale. In particolare si trova la forma astratta dell'equazione di Korteweg-de Vries, di Korteweg-de Vries modificata e dell'equazione di Schrödinger non lineare.
Similar content being viewed by others
References
C. S. Gardner, J. M. Greene, M. D. Kruskal andR. M. Miura:Phys. Rev. Lett.,19, 1095 (1967).
a)M. J. Ablowitz, D. J. Kaup, A. C., Newell andH. Segur:Stud. Appl. Math.,53, 249 (1974);b)F. Calogero andA. Degasperis:Nuovo Cimento B,32, 201 (1976);c 39, 1 (1977);d)M. J. Ablowitz:Stud. Appl. Math.,58, 17 (1978);e)A Degasperis:Spectral transform and solvability of nonlinear evolution equations, inNonlinear Problems in Theoretical Physics, edited byA. F. Rañada,Lecture Notes in Physics, Vol.98 (Berlin, 1979), p. 35;f)F. Calogero:Spectral transform and solitons: tools to solve and investigate nonlinear evolution equations, inNotes of Lectures Given at the Institute for Theoretical Physics in Groningen, April–June 1976.
a)C. S. Gardner:J. Math. Phys. (N. Y.),12, 1548 (1971);b)P. D. Lax:Commun. Pure Appl. Math.,28, 141 (1975);c)V. E. Zakharov andL. D. Faddeev:Funct. Anal. Appl.,5, 280 (1971);d)J. M. Gelfand andL. A. Dikii:Funct. Anal. Appl.,10, 13 (1976);11, 11 (1976) (in Russian);e)D. R. Lebedev andYu. I. Manin:Gelfand-Dikii Hamiltonian operator and coadjoint representation of Volterra group, Institute of Theoretical and Experimental Physics, ITEP 155 Moscow (1978);f)M. Adler:Inventiones Math.,50, 219 (1979).
P. D. Lax:Commun. Pure Appl. Math.,21, 467 (1968).
V. E. Zakharov andA. B. Shabat:Sov. Phys. JETP,34, 62 (1972).
a)M. Joulent andJ. J. P. Leon:Lett. Nuovo Cimento,23, 137 (1978);b)F. Calogero andA. Degasperis:Reduction technique for matrix nonlinear evolution equations solvable by the spectral transform, to be published inJ. Math. Phys. (N. Y.).
F. A. Berezin:Commun. Math. Phys.,63, 131 (1978).
F. A. Berezin andA. M. Perelomov:Group-theoretical interpretation of the Kortewegde Vries type equations, to be published inCommun. Math. Phys.
a)F. A. Berezin:Funct. Anal. Appl.,1, 1 (1967) (in Russian);b)A. A. Kirillov:Elements of the Theory of Representations (New York, N. Y., 1976).
a)B. Kostant:Quantization and unitary representations, inLecture Notes in Mathematics, Vol.170 (New York, N. Y., 1970);b)J. M. Souriau:Structure des systèmes dynamiques (Paris, 1970).
a)D. V. Chudnovsky andG. V. Chudnovsky:Phys. Lett. A,73, 292 (1979);b)D. V. Chudnovsky:Phys. Lett. A,74, 185 (1979).
R. Hirota:J. Math. Phys. (N. Y.),14, 805 (1973).
Author information
Authors and Affiliations
Additional information
F. A. Berezin died in a tragic accident in July of this year; this paper, that follows from his pioneering work, is devoted to his memory.
Rights and permissions
About this article
Cite this article
Degasperis, A., Olshanetsky, M.A. & Perelomov, A.M. Group-theoretical approach to a class of lax equations including those solvable by the spectral transform. Nuov Cim A 59, 245–262 (1980). https://doi.org/10.1007/BF02816662
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF02816662