Dark equations

Abstract

Observing the Universe, astronomers have concluded that the motion of stars can not be accounted for unless one assumes that most of the mass in the Universe is carried on by a ``dark matter", so far impervious to all attempts at being detected. There is now a similar concept of ``dark energy". I shall discuss a different subject, ``dark equations". These have never indicated that they influence anything or even exist, but if one supposes that they do exist, one can systematically discover them and study their properties, some of which turn out to be strange and others mysterious. These equations are similar in spirit to what one gets when linearizing a given system, or studies how an external linear wave interacts with a particular solution of a given system. We define and study linear extensions of dynamical systems in general, and integrable and Hamiltonian systems in particular. Systems discussed include the KdV and mKdV equations and the associated Miura maps, the Burgers hierarchy and the associated Hopf--Cole transformations, long wave equations, the Benney hierarchy, and the KP hierarchy.

Cited by in corpus (10)

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• Ren-integrable and ren-symmetric integrable systems
• Extensions of dark KdV equations: nonhomogeneous classifications, bosonizations of fermionic systems and supersymmetric dark systems
• Deformations of non semisimple Poisson pencils of hydrodynamic type
• Construction and separability of nonlinear soliton integrable couplings
• Solutions of matrix NLS systems and their discretisations: A unified treatment
• Reciprocal transformations and deformations of integrable hierarchies
• On a class of inhomogeneous extensions for integrable evolution systems
• Recursion operators in the cotangent covering of the rdDym equation