A. Martín-Ruiz

collaborators

2 papers

math.DS2026

Newton geometry of Bogdanov-Takens degeneracies in integrable dilatonic models: invariant divisors and boundary multiplicity

E. Chan-López, A. Martín-Ruiz, J. M. Paulin Fuentes

The Kantowski--Sachs interior of Grumiller's two-dimensional dilaton gravity model reduces to $H ˙ = \frac{1}{2} (Λ - 3 H^{2} - u^{2}) + Q u$ , $u ˙ = - H u$ , where $H$ is the expansion rate of the…

math-ph2026

Matrix bordering structure of the Faddeev-Jackiw algorithm: kernel reduction and symbolic automation

E. Chan-López, A. Martín-Ruiz, Jaime Manuel Cabrera +1

We show that the iterative Faddeev-Jackiw (FJ) reduction for singular Lagrangian systems constitutes a geometrically constrained instance of the Matrix Bordering Technique (MBT). S…