Borel summability conjecture for transseries solutions of Painlevé III'

Let RoddR_{\rm odd} be the odd part of the formal WKB solution, and let λ(t,c,η;α)\lambda(t,{\bf c},\eta;\alpha) be the corresponding transseries solution of (PIII)D6(P_{\rm III'})_{D_{6}}, with formal power-series components λ(k)(t,c,η)\lambda^{(k)}(t,{\bf c},\eta). Assume that the integral of RoddR_{\rm odd} in the first part of the one-parameter solution is taken along a path that never touches any turning points, the simple pole, or Stokes curves, and assume that Reϕ<0\operatorname{Re}\phi<0. Borel summability conjecture. The transseries solution is Borel summable in the general sense, each λ(k)(t,c,η)\lambda^{(k)}(t,{\bf c},\eta) is Borel summable, and

S[λ(t,c,η;α)]=k0(αη1/2)kS[λ(k)(t,c,η)]ekηϕ{\cal S}[\lambda(t,{\bf c},\eta;\alpha)] = \sum_{k \ge 0} (\alpha \eta^{-1/2})^{k} {\cal S}[\lambda^{(k)}(t,{\bf c},\eta)] e^{k\eta\phi}

converges for sufficiently large η>0\eta>0 and represents an analytic solution of (PIII)D6(P_{\rm III'})_{D_{6}}. Here S[λ(k)(t,c,η)]{\cal S}[\lambda^{(k)}(t,{\bf c},\eta)] denotes the Borel sum of the formal power series λ(k)(t,c,η)\lambda^{(k)}(t,{\bf c},\eta). The conjecture concerns the Borel summability of transseries solutions under the stated Stokes-geometric conditions; the paper motivates it by a result of Kamimoto, but the supplied text does not establish the full assertion.

Sources & referencesView supporting material

Primary source

Kohei Iwaki, “Voros coefficients of the third Painelv'e equation and parametric Stokes phenomena”, arXiv:1303.3603 (2013).

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