Gabriele La Nave

A continuity method to construct canonical metrics

We introduce a new continuity method which, although less natural than flows such as the Kähler–Ricci flow, has the advantage of preserving a lower bound on the Ricci curvature, hence allowing the application of comparison geometry techniques, such as Cheeger–Colding–Tian’s compactness theory.

Singularities and K-semistability

In this paper we extend the notion of Futaki invariant to big and nef classes in such a way that it defines a continuous function on the K cone up to the boundary. We apply this concept to prove that reduced normal crossing singularities are sufficient to check

Bounding Diameter Of Singular Kähler Metric

K

Geodesically complete metrics and boundary non-locality in holography: Consequences for the entanglement entropy

-semistability. A similar improvement on Donaldsons lower bound for Calabi energy is given.

Geometric flows and Kähler reduction

abstract:In this paper we investigate the differential geometric and algebro-geometric properties of the noncollapsing limit in the continuity method that was introduced by the first two authors.

On the curvature of conic Kähler-Einstein metrics

We show explicitly that the full structure of IIB string theory is needed to remove the non-localities that arise in boundary conformal theories that border hyperbolic spaces on AdS

Bounding diameter of singular K\"ahler metric

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Macroscopic dimension and fundamental group of manifolds with positive isotropic curvature

. Specifically, using the Caffarelli/Silvestricite{caffarelli}, Graham/Zworskicite{graham}, and Chang/Gonzalezcite{chang:2010} extension theorems, we prove that the boundary operator conjugate to bulk p-forms with negative mass in geodesically complete metrics is inherently a non-local operator, specifically the fractional conformal Laplacian. The non-locality, which arises even in compact spaces, applies to any degree p-form such as a gauge field. We show that the boundary theory contains fractional derivatives of the longitudinal components of the gauge field if the gauge field in the bulk along the holographic direction acquires a mass via the Higgs mechanism. The non-locality is shown to vanish once the metric becomes incomplete, for example, either 1) asymptotically by adding N transversely stacked Dd-branes or 2) exactly by giving the boundary a brane structure and including a single transverse Dd-brane in the bulk. The original Maldacena conjecture within IIB string theory corresponds to the former. In either of these proposals, the location of the Dd-branes places an upper bound on the entanglement entropy because the minimal bulk surface in the AdS reduction is ill-defined at a brane interface. Since the brane singularities can be circumvented in the full 10-dimensional spacetime, we conjecture that the true entanglement entropy must be computed from the minimal surface in 10-dimensions, which is of course not minimal in the AdS

The Gromov limit for vortex moduli spaces

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Fractional Virasoro Algebras

reduction.