arXiv subjects

Martin Klimeš

Publications and source records attributed to Martin Klimeš.

4 recordsLinked to original sources

arXiv2024

Deformations of singularities of meromorphic $\mathfrak{sl}_2(\mathbb{C})$-connections and meromorphic quadratic differentials

This paper contributes to the theory of singularities of meromorphic linear ODEs in traceless $2\times2$ cases, focusing on their deformations and confluences. It is divided into two parts: The first part addresses individual singularities without imposing restrictions on their type or degeneracy. The main result establishes a correspondence between local formal invariants and jets of meromorphic quadratic differentials. This result is then utilized to describe the parameter space of universal isomonodromic deformation of meromorphic $\mathfrak{sl}_2(\mathbb{C})$-connections over Riemann surfaces. The second part examines the confluence of singularities in a fully general setting, accommodating all forms of degeneracies. It explores the relationship between the geometry of the unfolded Stokes phenomenon and the horizontal and vertical foliations of parametric families of quadratic differentials. The local moduli space is naturally identified with a specific space of local monodromy and Stokes data, presented as a space of representations of certain fundamental groupoids associated with the foliations. This is then used for studying degenerations of isomonodromic deformations in parametric families.

math.CA↗

arXiv2022

Reversible parabolic diffeomorphisms of $(\mathbb{C}^2,0)$ and exceptional hyperbolic CR-singularities

The aim of this article is twofold: First we study holomorphic germs of parabolic diffeomorphisms of $(\mathbb{C}^2,0)$ that are reversed by a holomorphic reflection and posses an analytic first integral with non-degenerate critical point at the origin. We find a canonical formal normal form and provide a complete analytic classification (in formal generic cases) in terms of a collection of functional invariants. Their restriction to an irreductible component of the zero locus of the first integral reduces to the Birkhoff--Écalle--Voronin modulus of the 1-dimensional restricted parabolic germ. We then generalize this classification also to germs of anti-holomorphic diffeomorphisms of $(\mathbb{C}^2,0)$ whose square iterate is of the above form. Related to it, we solve the problem of both formal and analytic classification of germs of real analytic surfaces in $\mathbb{C}^2$ with non-degenerate CR singularities of exceptional hyperbolic type, under the assumption that the surface is holomorphically flat, i.e. that it can be locally holomorphically embedded in a real hyperplane of $\mathbb{C}^2$.

math.CV↗

arXiv2020

Analytic classification of families of linear differential systems unfolding a resonant irregular singularity

We give a complete classification of analytic equivalence of germs of parametric families of systems of complex linear differential equations unfolding a generic resonant singularity of Poincare rank 1 in dimension $n = 2$ whose leading matrix is a Jordan bloc. The moduli space of analytic equivalence classes is described in terms of a tuple of formal invariants and a single analytic invariant obtained from the trace of monodromy, and analytic normal forms are given. We also explain the underlying phenomena of confluence of two simple singularities and of a turning point, the associated Stokes geometry, and the change of order of Borel summability of formal solutions in dependence on a complex parameter.

math.DS↗

arXiv2019

Remarks on rational vector fields on $\mathbb C\mathbb P^1$

In this paper we introduce geometric tools to study the families of rational vector fields of a given degree over $\mathbb C\mathbb P^1$. To a generic vector field of such a parametric family we associate several geometric objects: a periodgon, a star domain and a translation surface. These objects generalize objects with the same name introduced in previous works on polynomial vector fields. They are used to describe the bifurcations inside the families. We specialize to the case of rational vector fields of degree $4$.

math.DS↗