Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1993-11-11
J.Phys. A27 (1994) 4629-4644
Physics
High Energy Physics
High Energy Physics - Theory
24 pages, (macro included), CERN-TH.6998/93, US-FT-8/93, SWAT/93-92/10
Scientific paper
10.1088/0305-4470/27/13/036
The non-isospectral symmetries of a general class of integrable hierarchies are found, generalizing the Galilean and scaling symmetries of the Korteweg--de Vries equation and its hierarchy. The symmetries arise in a very natural way from the semi-direct product structure of the Virasoro algebra and the affine Kac--Moody algebra underlying the construction of the hierarchy. In particular, the generators of the symmetries are shown to satisfy a subalgebra of the Virasoro algebra. When a tau-function formalism is available, the infinitesimal symmetries act directly on the tau-functions as moments of Virasoro currents. Some comments are made regarding the r\^ole of the non-isospectral symmetries and the form of the string equations in matrix-model formulations of quantum gravity in two-dimensions and related systems.
Guillen Joaquin Sanchez
Hollowood Timothy J.
Miramontes Luis J.
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