H. Işıl Bozma | Searcharxiv

arXiv2018

Morse-Bott functions on orthogonal groups

We make a detailed study of various (quadratic and linear) Morse-Bott trace functions on the orthogonal groups $O(n)$. We describe the critical loci of the quadratic trace function Tr$(AXBX^T)$ and determine their indices via perfect fillings of tables associated with the multiplicities of the eigenvalues of $A$ and $B$. We give a simplified treatment of T. Frankel's analysis of the linear trace function on $SO(n)$, as well as a combinatorial explanation of the relationship between the mod $2$ Betti numbers of $SO(n)$ and those of the Grassmannians $\mathbb{G}(2k,n)$ obtained from this analysis. We review the basic notions of Morse-Bott cohomology in a simple case where the set of critical points has two connected components. We then use these results to give a new Morse-theoretic computation of the mod $2$ Betti numbers of $SO(n)$.

math.GT↗

arXiv2015

Sequential gradient dynamics in real analytic Morse systems

Let $Ω$ in $R^M$ be a compact connected $M$-dimensional real analytic domain with boundary and $ϕ$ be a primal navigation function; i.e. a real analytic Morse function on $Ω$ with a unique minimum and with minus gradient vector field $G$ of $ϕ$ on the boundary of $Ω$ pointed inwards along each coordinate. Related to a robotics problem, we define a sequential hybrid process on $Ω$ for $G$ starting from any initial point $q_0$ in the interior of $Ω$ as follows: at each step we restrict ourselves to an affine subspace where a collection of coordinates are fixed and allow the other coordinates change along an integral curve of the projection of $G$ onto the subspace. We prove that provided each coordinate appears infinitely many times in the coordinate choices during the process, the process converges to a critical point of $ϕ$. That critical point is the unique minimum for a dense subset in primal navigation functions. We also present an upper bound for the total length of the trajectories close to a critical point.

math.DS↗