The paper explores deformations of compact holomorphic Poisson submanifolds.
problem Deformations of compact holomorphic Poisson submanifolds.
method Study of deformations through Kodaira's series and algebraic methods.
result Identification of first-order deformations and obstructions.
Study of holomorphic submanifolds in hypercomplex manifolds with specific metrics.
problem Characterizing holomorphic submanifolds in hypercomplex manifolds with Hermitian and Norden metrics.
method Investigation of necessary and sufficient conditions for total umbilicity and geodesicity.
result Conditions for holomorphic submanifolds to be totally umbilical or totally geodesic are derived.
Holomorphic Riemannian geometry connects submanifolds in different spaces.
problem Relating submanifolds in pseudo-Riemannian spaces.
method Rephrasing and extending holomorphic Riemannian theory to apply it to submanifolds.
result Holomorphic Riemannian geometry links submanifolds across different spaces.
Minimal real Kähler submanifolds in codimension 6 are holomorphic.
problem Characterizing real Kähler submanifolds in high codimension.
method Using isometric rigidity and properties of the second fundamental form.
result Minimal real Kähler submanifolds in codimension 6 are holomorphic.
Study optimal holomorphic extensions for jets along submanifolds as tensor powers increase.
problem Optimal holomorphic extensions of jets along submanifolds for high tensor powers.
method Careful study of Schwartz kernels and Bergman projectors for asymptotic analysis.
result Explicit asymptotic formula for the extension operator as tensor power tends to infinity.
Study CR-statistical submanifolds in holomorphic statistical spaces.
problem Characterize CR-statistical submanifolds and their properties.
method Optimization technique to relate Ricci curvature and mean curvature.
result Established relationship between Ricci curvature and mean curvature.
The paper shows conditions under which a Kaehler submanifold is minimal or holomorphic.
problem Characterizing conditions for Kaehler submanifolds to be minimal or holomorphic.
method Analyzing the second fundamental form of the submanifold and proving conditions on its rank.
result For codimension p≤11, a Kaehler submanifold is holomorphic with respect to some complex structure in the ambient space. Analytic linearization and holomorphic extensions for proper groupoids.
problem Analytic linearization and holomorphic extensions of proper groupoids.
method Establish analytic linearization around invariant submanifolds and apply to holomorphic extensions.
result Proper groupoids admit holomorphic extensions.
Study neighbourhoods of submanifolds in generalized complex geometry.
problem Understanding the structure and deformations of submanifolds in generalized complex geometry.
method Analytical tools including Hodge decompositions and Nash-Moser algorithm.
result Explicit conditions for B-field equivalence of holomorphic Poisson structures.
Study complex properties of minimal Lagrangian submanifolds in Kaehler spaces.
problem Complex properties of minimal Lagrangian submanifolds in Kaehler spaces.
method Mix of holomorphic curve techniques and convexity results.
result Minimal Lagrangians do not admit fillings by holomorphic discs in negative curvature case.
The paper generalizes hyperkahler metrics near Lagrangian submanifolds.
problem Constructing hyperkahler structures near complex Lagrangian submanifolds.
method Generalization of Feix-Kaledin theorem and deformations of holomorphic symplectic structures.
result Hyperkahler structures can be constructed on symplectic realizations of holomorphic Poisson manifolds.
The intersection of certain submanifolds yields J-holomorphic curves.
problem Characterizing intersections of almost complex submanifolds.
method Using differential geometry of almost Hermitian manifolds to produce J-holomorphic curves.
result Degree one pseudoholomorphic maps between almost complex 4-manifolds are birational morphisms.
In G2 manifolds, 3-dimensional associative submanifolds (instantons) play a role similar to J-holomorphic curves in symplectic geometry. In [21], instantons in G2 manifolds were constructed from regular J-holomorphic curves in coassociative submanifolds. In this exposition paper, after reviewing the background of G2 ge…
The paper finds charts for Legendrian curves in complex contact manifolds.
problem Finding charts for Legendrian curves in complex contact manifolds.
method Holomorphic Darboux charts and approximations of Legendrian immersions.
result Holomorphic Legendrian immersions can be approximated by embeddings.
Study characterizes totally geodesic submanifolds in quotient spaces.
problem Characterizing totally geodesic submanifolds in quotient spaces.
method Characterization through totally geodesic submanifolds and holomorphic tangent sequence splitting.
result Characterization of totally geodesic submanifolds in quotient spaces.
Study blow-ups in generalized complex geometry using holomorphic ideals.
problem Blow-ups in generalized complex geometry.
method Introduce holomorphic ideal to define blow-ups in smooth manifolds. Identify suitable submanifolds and provide conditions for blow-ups.
result Necessary and sufficient conditions for generalized Poisson submanifolds to carry a canonical holomorphic ideal and for blow-ups to be generalized complex.
Estimates holomorphic sections on Bohr-Sommerfeld Lagrangian submanifolds.
problem Estimating norms of holomorphic sections on complex manifolds.
method Asymptotic analysis of holomorphic sections on Bohr-Sommerfeld Lagrangian submanifolds.
result Asymptotic estimates of holomorphic sections on Bohr-Sommerfeld Lagrangian submanifolds.
The CR δ-invariant for CR-submanifolds was introduced in a recent article [B. Y. Chen, An optimal inequality for CR-warped products in complex space forms involving CR δ-invariant, Internat. J. Math. 23} (2012), no. 3, 1250045 (17 pages)]. In this paper, we prove two new optimal inequalities for anti-holomorphic su…
Study splitting submanifolds in specific homogeneous spaces.
problem Classify splitting submanifolds in rational homogeneous spaces of Picard number one.
method Use global holomorphic vector fields and projection maps to analyze submanifolds.
result Proves submanifolds in certain spaces are rational or Hermitian symmetric.
Study on submanifolds with specific types of factors in Kaehler manifolds.
problem Characterizing submanifolds with holomorphic, totally real, and slant factors.
method Introduced sequential warped product submanifolds, established Chen's and pinching inequalities.
result Found geometric results under equality cases of pinching inequalities.
Study on special null submanifolds in indefinite Sasakian manifolds.
problem Characterizing null submanifolds in indefinite Sasakian manifolds.
method Proving properties of screen conformal null submanifolds and defining a new class.
result Existence of contact screen conformal r-null submanifolds in indefinite Sasakian space forms. Minimal Kaehler submanifolds up to codimension four are studied.
problem Characterizing Kaehler submanifolds in high codimensions.
method Analyzing isometric immersions and compositions of submanifolds.
result Holomorphicity or composition of submanifolds with specific properties.
In 1991, Dajczer and Rodriguez proved in [10] that a complete minimal real Kahler submanifold of codimension 2, if with complex dimension > 2, would be either holomorphic, or a cylinder, or complex ruled. In this article, we generalize their result to real analytic complete real Kahler submanifolds of codimension 4. Th…
Study limits of Kähler submanifolds and prove no holomorphic isometries.
problem Understanding limits of Kähler submanifolds and their isometries.
method Gromov-Hausdorff convergence and scalar curvature bounds.
result Holomorphic isometries cannot exist between certain Kähler manifolds and projective spaces.
Griffiths' first obstruction formula for vector bundles is derived.
problem Extending holomorphic vector bundles from submanifolds.
method Explicit formula using Atiyah class.
result Formula for the first obstruction.
Extremal Kähler submanifolds of complex projective spaces have natural extensions.
problem Understanding the structure and properties of extremal Kähler submanifolds.
method Analyzing the natural extensions and holomorphic isometric immersions of extremal Kähler submanifolds.
result Every connected extremal Kähler submanifold has a natural extension which is a complete Kähler manifold.
Paper studies Lagrangian submanifolds and their homological monodromy.
problem Understanding the homological monodromy of Lagrangian submanifolds.
method Proves triviality of homological Lagrangian monodromy under specific conditions.
result Homological Lagrangian monodromy is trivial if Hofer energy is less than minimum energy of J-holomorphic spheres and discs.
The study of real Einstein submanifolds in Kähler geometry.
problem Understanding real Einstein submanifolds in Kähler geometry.
method Provided a necessary and sufficient condition for anti-holomorphic automorphisms to determine real Einstein submanifolds.
result A condition for determining real Einstein submanifolds in compact Kähler-Einstein manifolds.
We give some results concerning the smoothness of the image of a real-analytic submanifold in complex space under the action of a finite holomorphic mapping. For instance, if the submanifold is not contained in a proper complex subvariety, we give a necessary and sufficient condition guaranteeing that its image is smoo…
Let X be a compact Kahler manifold with a non-trivial holomorphic Poisson structure. Then there exist deformations of non-trivial generalized Kahler structures with one pure spinor on X. We prove that every Poisson submanifold of X is a generalized Kahler submanifold with respect to the deformed generalized Kahler stru…
We introduce holomorphic Riemannian maps between almost Hermitian manifolds as a generalization of holomorphic submanifolds and holomorphic submersions, give examples and obtain a geometric characterization of harmonic holomorphic Riemannian maps from almost Hermitian manifolds to Kaehler manifolds.
Study cone structures on contact manifolds to understand their geometric properties.
problem Characterize cone structures on holomorphic contact manifolds.
method Characterize subadjoint varieties among Legendrian submanifolds in terms of contact prolongations.
result Holomorphic horizontal splitting of the canonical distribution on contact G-structures.
The paper solves a long-standing problem by providing a symplectic realization for holomorphic Poisson manifolds.
problem Symplectic realization of holomorphic Poisson manifolds.
method Explicit construction of a holomorphic symplectic structure in a neighborhood of the zero section of T∗X. result There exists a holomorphic symplectic structure in a neighborhood of the zero section of T∗X such that the projection map is a symplectic realization of the given Poisson manifold. We prove that pseudo-holomorphic discs attached to a maximal totally real submanifold inherit their regularity from the regularity of the submanifold and of the almost complex structure. The proof is based on the computation of an explicit lower bound for the Kobayashi metric in almost complex manifolds, which also yie…
The purpose of this note is to establish the following theorem: Let N be a Kahler manifold, L be a compact oriented immersed minimal Lagrangian submanifold in N and V be a holomorphic vector field in a neighbourhood of L in N. Let div(V) be the (complex) divergence of V. Then the integral of div(V) over L is 0. Vice ve…
The paper confirms a conjecture about submanifolds in Euclidean space.
problem Addressing a conjecture about non-holomorphic Kaehler submanifolds in Euclidean space.
method Analyzing the structure of the second fundamental form and ruling dimensions.
result The conjecture is confirmed for codimensions p ≤ 6, and for p = 7 to 11 under additional assumptions.
We use Donaldson's approximately holomorphic techniques to build embeddings of a closed symplectic manifold with symplectic form of integer class in the grassmannians Gr(r,N). We assure that these embeddings are asymptotically holomorphic in a precise sense. We study first the particular case of embeddings in the proje…
Study of conformal limits in Nakajima quiver varieties.
problem Understanding the conformal limits of Nakajima quiver varieties.
method Defined and studied a conformal limit construction for Nakajima quiver varieties, proving it is a limit of a one-parameter family and gives a biholomorphic map.
result Proved the conformal limit is a biholomorphic map between Lagrangian submanifolds of different quiver varieties.
Study extends Nirenberg-Spencer's question to families of submanifolds.
problem Determine the germ of compact complex submanifolds in complex manifolds.
method Reformulate the question for families of submanifolds and their infinitesimal neighborhoods. Prove sufficient conditions for first-order neighborhoods and additional assumptions for submanifolds with nonzero vector fields.
result Affirmative answer to the reformulated question for certain submanifolds.
In this paper we study the geometry of manifolds with vector cross product and its complexification. First we develop the theory of instantons and branes and study their deformations. For example they are (i) holomorphic curves and Lagrangian submanifolds in symplectic manifolds and (ii) associative submanifolds and co…
It is proved that a germ of a real analytic CR map from a smooth real-analytic minimal CR manifold M to an essentially finite real-algebraic generic submanifold M' of P^N of the same CR-dimension extends as a holomorphic correspondence along M. Applications are given for pseudoconcave submanifolds of P^N.
Study optimal holomorphic extensions on complex manifolds with transitivity property.
problem Optimal holomorphic extensions on complex manifolds with transitivity property.
method Use Toeplitz operators and transitivity property for optimal holomorphic extensions.
result Transitivity property of optimal holomorphic extensions with small defect.
The article develops deformation theory for ACyl associative submanifolds in ACyl G2-manifolds.
problem Deformation theory of ACyl associative submanifolds in ACyl G2-manifolds.
method Study of moduli spaces with fixed and varying asymptotic data, computing virtual dimensions.
result The moduli space of ACyl associative submanifolds embeds as a Lagrangian submanifold in the moduli space of holomorphic curves.
The thesis extends Riemannian submanifold theory to non-real settings, unifying various geometries.
problem Generalizing Riemannian geometry and submanifold theory to non-real settings.
method Developing 'Rinehart spaces' and holomorphic Riemannian submanifolds theory.
result Unified framework for various geometries over different ground rings.
Study relationships between submanifolds and ambient Kahler 4-manifolds' fundamental groups.
problem Relationships between submanifolds and fundamental groups of Kahler 4-manifolds.
method Analyzes fundamental groups of embedded Levi-flat or pseudoconvex submanifolds in Kahler 4-manifolds.
result Fundamental group of M4 determined by the fundamental group of compact embedded Levi-flat or pseudoconvex submanifolds. Method constructs rigid associative submanifolds in twisted G2-manifolds.
problem Constructing rigid associative submanifolds in twisted G2-manifolds.
method Introducing a gluing theorem for asymptotically cylindrical associative submanifolds in ACyl G2-manifolds.
result Yields many new topological types of rigid associative submanifolds.
We prove an extension of a theorem of A.Ros on a characterization of seven compact Kaehler submanifolds by holomorphic pinching to certain submanifolds of the complex Grassmannian manifolds.
New examples of austere submanifolds found in higher rank.
problem Finding non-trivial explicit examples of austere submanifolds.
method Holomorphic data and Weierstrass type parametrization.
result First explicitly given family of austere non-Kaehler submanifolds of higher rank.