The deformed Vortex equations and equivariant stability conditions

We study the higher rank deformed Hermitian-Yang-Mills (dHYM) equations for $SU(2)$-equivariant holomorphic vector bundles over $X\times {\mathbb{P}}^1$ for $X$ a compact Riemann surface. For a class of vector bundles of vortex type, we establish the equivalence between existence of solutions to higher rank dHYM equations and an appropriate notion of algebro-geometric stability, called $Z$-stability. We show that $Z$-stability is implied by, and conjecturally equivalent to, Bridgeland stability in $D^b{\mathrm{C}\mathrm{o}\mathrm{h}}^{SU(2)}(X\times {\mathbb{P}}^1)$.