A characterization of some Fano 4-folds through conic fibrations

We find a characterization for Fano 4-folds $X$ with Lefschetz defect $\delta_{X}=3$: besides the product of two del Pezzo surfaces, they correspond to varieties admitting a conic bundle structure $f\colon X\to Y$ with $\rho_{X}-\rho_{Y}=3$. Moreover, we observe that all of these varieties are ratio...

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Hauptverfasser:	Montero, Pedro, Romano, Eleonora Anna
Format:	Artikel
Sprache:	eng
Schlagworte:	Mathematics - Algebraic Geometry
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