On the Riemann-Hilbert approach to asymptotics of tronqu\'ee solutions of Painlev\'e I

Abstract

In this paper, we revisit large variable asymptotic expansions of tronqu\'ee solutions of the Painlev\'e I equation, obtained via the Riemann-Hilbert approach and the method of steepest descent. The explicit construction of an extra local parametrix around the recessive stationary point of the phase function, in terms of complementary error functions, makes it possible to give detailed information about non-perturbative contributions beyond standard Poincar\'e expansions for tronqu\'ee and tritronqu\'ee solutions.