Panagiotis Konstantis

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math.AT2026

Almost quaternionic structures on compact rank one symmetric spaces

Oliver Goertsches, Panagiotis Konstantis, Eugenia Loiudice +1

We prove that the only CROSSes that admit a (not necessarily homogeneous) almost quaternionic structure are $H P^{n}$ and $C P^{2}$ .

math.AT2025

On torus equivariant $S^{4}$ -bundles over $S^{4}$ and Petrie-type questions for GKM manifolds

Oliver Goertsches, Panagiotis Konstantis, Leopold Zoller

We classify $T^{2}$ -GKM fibrations in which both fiber and base are the GKM graph of $S^{4}$ , with standard weights in the base. For each case in which the total space is orientable, w…

math.AT2025

On GKM fiber bundles and realizability with full flag fibers

Oliver Goertsches, Panagiotis Konstantis, Nikolas Wardenski +1

We investigate under which conditions an equivariant fiber bundle whose base, total space and fiber are GKM manifolds induces a fibration or fiber bundle of the corresponding GKM g…

Almost quaternionic structures on compact rank one symmetric spaces

On torus equivariant S4-bundles over S4 and Petrie-type questions for GKM manifolds

On GKM fiber bundles and realizability with full flag fibers

On torus equivariant $S^{4}$ -bundles over $S^{4}$ and Petrie-type questions for GKM manifolds