
SIGMA 15 (2019), 032, 15 pages arXiv:1811.07138
https://doi.org/10.3842/SIGMA.2019.032
Construction of Two Parametric Deformation of KdVHierarchy and Solution in Terms of Meromorphic Functions on the Sigma Divisor of a Hyperelliptic Curve of Genus 3
Takanori Ayano ^{a} and Victor M. Buchstaber ^{b}
^{a)} Osaka City University, Advanced Mathematical Institute, 33138 Sugimoto, Sumiyoshiku, Osaka, 5588585, Japan
^{b)} Steklov Mathematical Institute of Russian Academy of Sciences, 8 Gubkina Street, Moscow, 119991, Russia
Received November 21, 2018, in final form April 11, 2019; Published online April 27, 2019
Abstract
Buchstaber and Mikhailov introduced the polynomial dynamical systems in $\mathbb{C}^4$ with two polynomial integrals on the basis of commuting vector fields on the symmetric square of hyperelliptic curves. In our previous paper, we constructed the field of meromorphic functions on the sigma divisor of hyperelliptic curves of genus 3 and solutions of the systems for $g=3$ by these functions. In this paper, as an application of our previous results, we construct two parametric deformation of the KdVhierarchy. This new system is integrated in the meromorphic functions on the sigma divisor of hyperelliptic curves of genus 3. In Section 8 of our previous paper [Funct. Anal. Appl. 51 (2017), 162176], there are miscalculations. In appendix of this paper, we correct the errors.
Key words: Abelian functions; hyperelliptic sigma functions; polynomial dynamical systems; commuting vector fields; KdVhierarchy.
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References
 Ayano T., Buchstaber V.M., The field of meromorphic functions on a sigma divisor of a hyperelliptic curve of genus 3 and applications, Funct. Anal. Appl. 51 (2017), 162176, arXiv:1811.05806.
 Baker H.F., On the hyperelliptic sigma functions, Amer. J. Math. 20 (1898), 301384.
 Baker H.F., On a system of differential equations leading to periodic functions, Acta Math. 27 (1903), 135156.
 Baker H.F., An introduction to the theory of multiply periodic functions, Cambridge University Press, Cambridge, 1907, available at http://name.umdl.umich.edu/ACR0014.0001.001.
 Buchstaber V.M., Polynomial dynamical systems and the Kortewegde Vries equation, Proc. Steklov Inst. Math. 294 (2016), 176200, arXiv:1605.04061.
 Buchstaber V.M., Enolskii V.Z., Leykin D.V., Rational analogs of Abelian functions, Funct. Anal. Appl. 33 (1999), 8394.
 Buchstaber V.M., Enolskii V.Z., Leykin D.V., Multidimensional sigmafunctions, arXiv:1208.0990.
 Buchstaber V.M., Enolskii V.Z., Leykin D.V., Multivariable sigmafunctions: old and new results, arXiv:1810.11079.
 Buchstaber V.M., Mikhailov A.V., Infinitedimensional Lie algebras determined by the space of symmetric squares of hyperelliptic curves, Funct. Anal. Appl. 51 (2017), 221.
 Buchstaber V.M., Mikhailov A.V., The space of symmetric squares of hyperelliptic curves and integrable Hamiltonian polynomial systems on $\mathbb{R}^4$, arXiv:1710.00866.
 Matsutani S., Hyperelliptic solutions of KdV and KP equations: reevaluation of Baker's study on hyperelliptic sigma functions, J. Phys. A: Math. Gen. 34 (2001), 47214732, arXiv:nlin.SI/0007001.
 Matsutani S., Relations of al functions over subvarieties in a hyperelliptic Jacobian, Cubo 7 (2005), no. 3, 7585, arXiv:nlin.SI/0202035.
 Nakayashiki A., On algebraic expressions of sigma functions for $(n,s)$ curves, Asian J. Math. 14 (2010), 175211, arXiv:0803.2083.

