Institute for Mathematical Science

Stony Brook University

e-mail: rradu@math.stonybrook.edu

From 2013 to 2017 I was a Milnor Lecturer at the Institute for Mathematical Sciences
at Stony Brook University. I got my Ph.D. in Mathematics from Cornell University in 2013, under the supervision of John H. Hubbard.

I started my undergraduate studies at the University of Bucharest and after one year I transfered to Jacobs University Bremen, where I earned my B.S. degree in Mathematics in 2007.
I got a M.S. in Computer Science from Cornell University in 2012.

My interests are in the areas of Dynamical Systems (in one or several complex variables), Analysis,
Topology and the interplay between these fields.

My research is focused on the study of complex
Hénon maps, which are a special class of polynomial automorphisms of $\mathbb{C}^2$ with chaotic behavior.
I am interested in understanding the global topology of the Julia sets $J$, $J^-$ and $J^+$ of a complex
Hénon map and the dynamics of maps with partially hyperbolic behavior
such as holomorphic germs of diffeomorphisms of $(\mathbb{C}^n,0)$ with semi-neutral fixed points.
Some specific topics that I work on include: relative stability of semi-parabolic Hénon maps and connectivity of the
Julia set $J$, regularity properties of the boundary of a Siegel disk of a semi-Siegel Hénon map, local structure
of non-linearizable germs of diffeomorphisms of $(\mathbb{C}^n,0)$.

I was organizer for the Dynamics Seminar at Stony Brook University.

I have also developed projects for MEC (Math Explorer's Club): Mathematics of Web Search and
Billiards & Puzzles.

Last updated August 2017