arXiv research

The study examines elastic curves with self-intersections and their properties.

Study finds open manifolds without complete metrics with positive scalar curvature.

Solves embedding problem for 5D manifolds into Calabi-Yau 3-folds.

We prove that the open topological string partition function on a D-brane configuration in a Calabi-Yau manifold X takes the form of a closed topological string partition function on a different Calabi-Yau manifold X_b. This identification shows that the physics of D-branes in an arbitrary background X of topological s…

Graphs satisfy Li-Yau inequality under $CD(0,n)$ curvature condition.

Study of Martin boundary for rank 1 manifolds with nonpositive curvature.

In this paper, we derive a partial result related to a question of Yau: "Does a simply-connected complete Kähler manifold M with negative sectional curvature admit a bounded non-constant holomorphic function?" Main Theorem. Let $M^{2n}$ be a simply-connected complete Kähler manifold M with negative sectional curvature …

A geometrical structure on even-dimensional manifolds is defined which generalizes the notion of a Calabi-Yau manifold and also a symplectic manifold. Such structures are of either odd or even type and can be transformed by the action of both diffeomorphisms and closed 2-forms. In the special case of six dimensions we …

Schoen-Yau's zero mass theorem stability remains an open question.

New insights into Kähler Ricci solitons and Calabi-Yau cones.

Introduces new limit spaces for degenerating Calabi-Yau families.

Solves Calabi-Yau equation on symplectic manifolds using measurable Kahler metrics.

Constructs hyperbolic affine spheres and Calabi-Yau metrics.

Paper proves edge-connectivity equals minimum degree for graphs with non-negative curvature.

Solves Fu-Yau equation in arbitrary dimensions and slope.

We study the problem of counting instantons with coassociative boundary condition in (almost) G_(2)-manifolds. This is analog to the open Gromov-Witten theory for counting holomorphic curves with Lagrangian boundary condition in Calabi-Yau manifolds. We explain its relationship with the Seiberg-Witten invariants for co…

We derive a sharp, localized version of elliptic type gradient estimates for positive solutions (bounded or not) to the heat equation. These estimates are akin to the Cheng-Yau estimate for the Laplace equation and Hamilton's estimate for bounded solutions to the heat equation on compact manifolds. As applications, we …

New polystability theory connects Calabi-Yau varieties to gravitational instantons.

Study on Neumann eigenvalues controlled by domain isoperimetric ratio.

The Martin boundary of a Cartan-Hadamard manifold describes a fine geometric structure at infinity, which is a sub-space of positive harmonic functions. We describe conditions which ensure that some points of the sphere at infinity belong to the Martin boundary as well. In the case of the universal cover of a compact m…

In a recent preprint, Chi Li proved that aymptotically conical complex manifolds with regular tangent cone at infinity admit holomorphic compactifications (his result easily extends to the quasiregular case). In this short note, we show that if the open manifold is Calabi-Yau, then Chi Li's compactification is projecti…

Construct M-Theory lifts of type IIA orientifolds.

We have developed a mathematical theory of the topological vertex--a theory that was original proposed by M. Aganagic, A. Klemm, M. Marino, and C. Vafa in hep-th/0305132 on effectively computing Gromov-Witten invariants of smooth toric Calabi-Yau threefolds derived from duality between open string theory of smooth Cala…

A complex structure on a subset of S^6 cannot be extended to a global integrable structure.

Survey on metric SYZ conjecture and non-archimedean geometry.

Survey of complex analytic methods in minimal surface theory.

The paper studies deformations of Calabi-Yau manifolds using Gauduchon metrics.

Study LMOV invariants for a framed unknot in toric Calabi-Yau 3-folds.

Study simplifies Landau-Ginzburg models on Stein manifolds.

The abstract proves a conjecture about geometric structures in Calabi-Yau orbifolds.

New models for B-type topological theories using complex functions.

This paper has two purposes. First it partially extends the result in the author's previous work concerning the asymptotic expansion of the Tian-Yau metrics, by considering a slightly larger class of quasi-projective manifolds. This text is also intended to provide a quick introductory reference to the study of Ricci-f…

Motivated from mathematical aspects of the superstring theory, we introduce a new equation on a balanced, hermitian manifold, with zero first Chern class. Solving the equation, one will obtain, in each Bott--Chern cohomology class, a balanced metric which is hermitian Ricci--flat. This can be viewed as a differential f…

We propose localization techniques for computing Gromov-Witten invariants of maps from Riemann surfaces with boundaries into a Calabi-Yau, with the boundaries mapped to a Lagrangian submanifold. The computations can be expressed in terms of Gromov-Witten invariants of one-pointed maps. In genus zero, an equivariant ver…

Study disproves conjecture about Hermitian-Yang-Mills solutions.

We define the quantum correction of the Teichmüller space $\mathcal{T}$ of Calabi-Yau manifolds. Under the assumption of no weak quantum correction, we prove that the Teichmüller space $\mathcal{T}$ is a locally symmetric space with the Weil-Petersson metric. For Calabi-Yau threefolds, we show that no strong quantum co…

Simplified argument for second order estimate in quaternionic Calabi-Yau problem.

In the early 1980s, S. T. Yau conjectured that any compact Riemannian three-manifold admits an infinite number of closed immersed minimal surfaces. We use min-max theory for the area functional to prove this conjecture in the positive Ricci curvature setting. More precisely, we show that every compact Riemannian manifo…

We study the collapsing behaviour of Ricci-flat Kahler metrics on a projective Calabi-Yau manifold which admits an abelian fibration, when the volume of the fibers approaches zero. We show that away from the critical locus of the fibration the metrics collapse with locally bounded curvature, and along the fibers the re…

This thesis constructs mirrors for D-branes in toric Calabi-Yau manifolds.

We survey what is known about singularities of special Lagrangian submanifolds (SL m-folds) in (almost) Calabi-Yau manifolds. The bulk of the paper summarizes the author's five papers math.DG/0211294, math.DG/0211295, math.DG/0302355, math.DG/0302356, math.DG/0303272 on SL m-folds X with isolated conical singularities.…

Study collapsing geometry with Ricci curvature, proving Kähler metrics and Killing structures.

Uniformises Kähler surfaces with positive curvature to complex plane.

Tian and Yau constructed a complete Ricci-flat Kähler metric on the complement of an ample and smooth anticanonical divisor. We inquire into the behaviour of this metric towards the boundary divisor and prove a slow decay rate of the difference to an appropriate explicitely given referential metric.

Minimal surfaces' area bounds proven equivalent, extending known results.

The study proves a Liouville theorem for certain asymptotically conical Calabi-Yau manifolds.

We study a class of asymptotically cylindrical Ricci-flat Kähler metrics arising on quasiprojective manifolds. Using the Calabi--Yau geometry and analysis and the Kodaira--Kuranishi--Spencer theory and building up on results of N.Koiso for the case of compact manifolds, we show that under rather general hypotheses any …

Computes colored HOMFLYPT invariants using holomorphic curves.