Abstract
A method of studing of double scaling limits for the two-dimensional string models of quantum gravity is stated. It is actually shown that the study of such limits reduces to the isomonodromic deformation method for integrable discrete equations. A relationship is indicated between the “universality” and isomonodromy properties of the model. It is shown that the partition function of the model is the τ-function associated with the fourth Painlevé equation (ℙ4), and also the Volterra chain. We consider in detail the properties of the Bäcklund transformations for ℙ4. Bibliography: 19 titles.
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Translated fromZapiski Nauchnykh Seminarov POMI, Vol. 187, pp. 3–30, 1990.
Translated by O. A. Ivanov.
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It-s, A.R., Kitaev, A.V. & Fokas, A.S. Matrix models of two-dimensional quantum gravity and isomonodromic solutions of “discrete Painlevé” equations. J Math Sci 73, 415–429 (1995). https://doi.org/10.1007/BF02364564
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DOI: https://doi.org/10.1007/BF02364564