Direct proof for all conformally flat isoparametric submanifolds in Euclidean space.
problem Classifying conformally flat isoparametric submanifolds in Euclidean space.
method Direct proof approach.
result Complete classification of conformally flat isoparametric submanifolds of Euclidean space.
New method constructs holonomic immersions from flat submanifolds.
problem Creating holonomic immersions from flat submanifolds.
method Ribaucour transformation and principal coordinate system.
result Holonomic immersions can be constructed using Ribaucour transformation.
In Part I, we develop the notions of a Moebius structure and a conformal Cartan geometry, establish an equivalence between them; we use them in Part II to study submanifolds of conformal manifolds in arbitrary dimension and codimension. We obtain Gauss-Codazzi-Ricci equations and a conformal Bonnet theorem characterizi…
The study examines complete conformally flat submanifolds with nullity in Euclidean space.
problem Investigating properties of conformally flat submanifolds with nullity.
method Analyzing the index of relative nullity and scalar curvature to deduce manifold properties.
result Conditions for the manifold to be flat and the immersion to be a cylinder over a submanifold.
The study improves Wintgen inequalities for submanifolds in specific geometric spaces.
problem Improving Wintgen inequalities for submanifolds in various geometric spaces.
method Analyzing submanifolds in conformally flat manifolds and deriving inequalities for different types of spaces.
result Derived inequalities for submanifolds in various geometric spaces, including Riemannian manifolds of quasi-constant curvature and warped products.
In Kaehler manifolds are investigated conformally flat totally real submanifolds, which are semiparallel or have semiparallel mean curvature vector.
Defines a new energy for submanifolds, comparing to Willmore energy.
problem Finding new conformally invariant energies for submanifolds.
method Coupling tractor connection to GJMS operators for higher-dimensional analogues.
result Shows comparison with existing energy in 4D.
Paper explores conformal immersions of Kaehler manifolds into Euclidean space.
problem Understanding conformal immersions of Kaehler manifolds.
method Used techniques from S. Chion and M. Dajczer for hyperbolic space immersions.
result Proved properties of conformal immersions into Euclidean space.
3D projective structures can be metrized with conformal structures.
problem Weyl metrizability of 3D projective structures.
method Interpreting Weyl metrizability as CR submanifolds in 7D.
result Beltrami's theorem extends to conformal structures in 3D.
The paper explores p-biharmonic hypersurfaces in Einstein and conformally flat spaces.
problem Characterizing p-biharmonic submanifolds in Einstein spaces.
method Analyzing properties and constructing examples of p-biharmonic hypersurfaces.
result New examples of proper p-biharmonic hypersurfaces constructed.
E. Cartan proved that conformally flat hypersurfaces in S^{n+1} for n>3 have at most two distinct principal curvatures and locally envelop a one-parameter family of (n-1)-spheres. We prove that the Gauss-Codazzi equation for conformally flat hypersurfaces in S^4 is a soliton equation, and use a dressing action from sol…
The paper studies submanifolds of Euclidean space from Kaehler manifolds.
problem Understanding submanifolds of Euclidean space from Kaehler manifolds.
method Analyzing conformal immersions and isometric embeddings.
result Local constructions of submanifolds from Kaehler manifolds.
Embeds Lorentzian manifolds in \(\mathbb{R}^{n+2}\) with SO(2,n) compatibility.
problem Embedding Lorentzian manifolds in \(\mathbb{R}^{n+2}\) with specific metric properties.
method Embedding using SO(2,n) compatible metrics.
result Conformal transformations on submanifolds inherited from ambient space.
Constructs Lorentzian manifolds from Riemannian conformal structures.
problem Creating Lorentzian manifolds from Riemannian conformal structures.
method Starting from a Riemannian conformal structure, a family of Lorentzian manifolds is constructed using a metric in the conformal class and a 1-parameter family of tensor fields.
result Every Mobius structure on a Riemannian conformal structure arises from this construction.
Study of f-biharmonic hypersurfaces in conformally flat spaces.
problem Characterize f-biharmonic hypersurfaces in conformally flat spaces. method Analyze f-biharmonicity of totally umbilical hypersurfaces in various contexts. result Properties of f-biharmonic hypersurfaces in nonpositively curved manifolds. The paper proves curvature inequalities for submanifolds in space forms.
problem Proving curvature inequalities for submanifolds in space forms.
method Analyzing isometric immersions into space forms with flat normal bundle and constant scalar curvature.
result Global results on curvature inequalities for submanifolds in space forms.
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. The paper simplifies FLRW photon propagators using geometric embeddings.
problem Understanding Friedmann-Lemaître-Robertson-Walker (FLRW) spaces.
method Differential-geometric methods applied to FLRW spaces as submanifolds in \(\mathbb{R}^{n+2}\).
result New and simplified expressions for the photon propagator in four dimensions.
The generalized Chen's conjecture on biharmonic submanifolds asserts that any biharmonic submanifold of a non-positively curved manifold is minimal (see e.g., [CMO1], [MO], [BMO1], [BMO2], [BMO3], [Ba1], [Ba2], [Ou1], [Ou2], [IIU]). In this paper, we prove that this conjecture is false by constructing foliations of pro…
We classify biharmonic submanifolds with certain geometric properties in Euclidean spheres. For codimension 1, we determine the biharmonic hypersurfaces with at most two distinct principal curvatures and the conformally flat biharmonic hypersurfaces. We obtain some rigidity results for pseudo-umbilical biharmonic subma…
Classification of umbilical submanifolds in a specific Riemannian product space.
problem Classifying umbilical submanifolds in the product space HkimesSn−k+1. method Analyzing the conformally flat product space and using geometric properties to classify submanifolds.
result There exists a p-parameter family of umbilical submanifolds with codimension at most $\mbox{min}\,\{k+1, n-k+2\}$. Paper finds flag curvature of submanifolds in Randers-Minkowski space using Zermelo data.
problem Characterizing submanifolds with scalar flag curvature in Randers-Minkowski spaces.
method Expresses flag curvature in terms of Zermelo data invariants.
result Proves any h-flat hypersurface has scalar F-flag curvature and conformally flat metric.
Curves in higher dimensions are either affine or have super-Euclidean energy growth.
problem Characterizing entire conformal curves in higher-dimensional spaces.
method Blow-down argument and interaction of generalized Cauchy--Riemann equations with calibrated geometries.
result Entire conformal curves are either affine or have super-Euclidean energy growth.
Develops methods for computing conformal invariants of submanifolds.
problem Computing conformal invariants of submanifolds.
method Direct construction of extrinsic ambient space, global invariants of conformally compact minimal submanifolds, introduction of conformal submanifold scalars.
result Derives an explicit Gauss--Bonnet--Chern-type formula and proves a rigidity result.
New para-Kähler structure found in geodesic space.
problem Constructing a new para-Kähler structure in geodesic space.
method Developed a new para-Kähler metric and studied its properties in the space of oriented geodesics.
result The space of oriented geodesics in hyperbolic n-space is minimally isometric embedded with the constructed metric.
New findings on domains without parabolic minimal submanifolds and weakly hyperbolic domains.
problem Characterizing domains without parabolic minimal submanifolds and weakly hyperbolic domains.
method Analyzing properties of domains and their boundaries, using tubular neighborhoods and conformal harmonic maps.
result Domains without parabolic minimal submanifolds and weakly hyperbolic domains have specific geometric properties.
We study conformal Spin-subgeometry of submanifolds in a semi-Riemannian Spin-manifold, focusing on conformal Spin-manifolds (M,[h]) and their Poincaré-Einstein metrics (X,g+). Our approach is based on the spectral theory of Dirac operator in the ambient Spin-manifold, and associated spinor valued meromorp…
The paper classifies and studies conformal variations of submanifolds.
problem Classifying and understanding conformal variations of submanifolds.
method Develops a Fundamental theorem and a rigidity theorem for Euclidean submanifolds.
result Fundamental theorem and rigidity theorem for Euclidean submanifolds.
There is a Lorenzian group acting on the conformal space Qpn. We study the regular submanifolds in the conformal space Qpn and construct general submanifold theory in the conformal space Qpn. Finally we give the first variation formula of the Willmore volume functional of subma…
We extend to the conformal realm the concept of genuine deformations of submanifolds, introduced by Dajczer and the first author for the isometric case. Analogously to that case, we call a conformal deformation of a submanifold Mn genuine if no open subset of Mn can be included as a submanifold of a higher dimens…
The paper develops a comprehensive theory of submanifolds in conformal geometries.
problem Understanding submanifolds in conformal geometries of arbitrary dimension.
method Using conformal tractor calculus, the paper provides a new framework for studying submanifolds.
result The theory includes a new notion of distinguished submanifolds and characterizes them in various dimensions.
Derives GJMS operators and Q-curvatures for submanifolds.
problem Understanding geometric properties of submanifolds in conformal manifolds.
method Realizes conformal manifold as Poincaré-Einstein space boundary, derives operators as obstructions, uses ambient metric for conformal invariance.
result Explicit formulas and factorization for GJMS operators of orders 2 and 4, conformal invariance for all orders in all dimensions.
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 submanifolds are stable in certain conformal spheres.
problem Stability of minimal submanifolds in conformal spheres.
method Analyzing n-dimensional Riemannian spheres with specific curvature conditions. result Closed stable minimal submanifolds are not found in δ-pinched conformal spheres. Planes are the only calibrated submanifolds with flat normal bundles.
problem Characterizing submanifolds with specific geometric properties.
method Using constant-coefficient differential forms and parallel calibrations.
result Calibrated submanifolds with flat normal bundles are planes.
Extends flat submanifold properties from hyperbolic plane to symmetric spaces.
problem Spectral asymptotics for orbital integrals in symmetric spaces.
method Generalizes geodesic properties to maximal flat submanifolds.
result Establishes geometric properties of maximal flat submanifolds in symmetric spaces.
A method constructs tractor conformal bundles for spacelike submanifolds in Lorentzian manifolds.
problem Characterize conditions for a tractor conformal bundle to be standard and normal.
method Introduce a canonical construction of a tractor conformal bundle and characterize conditions for it to be standard and normal.
result Characterizes conditions for a tractor conformal bundle to be standard and normal.
Proves a special type of submanifolds in a curved space.
problem Characterizing submanifolds with specific properties in a curved space.
method Uses the properties of flat normal bundle and parallel mean curvature to prove the submanifolds are warped products.
result Einstein submanifolds with flat normal bundle and parallel mean curvature are warped product of isometric immersions.
Locally flat submanifolds have finite CW complex complements.
problem Understanding the structure of manifold complements.
method Direct proof using homotopy equivalence and CW complexes.
result Complements of locally flat submanifolds are finite CW complexes.
It was proved by Graham and Witten in 1999 that conformal invariants of submanifolds can be obtained via volume renormalization of minimal surfaces in conformally compact Einstein manifolds. The conformal invariant of a submanifold Σ is contained in the volume expansion of the minimal surface which is asymptotic to $…
2-stein submanifolds in space forms have constant curvature if normal connection is flat or codimension is 2.
problem Characterizing submanifolds with constant curvature in space forms.
method Analyzing submanifolds with flat normal connection or codimension 2.
result 2-stein submanifolds have constant curvature under specified conditions.
Study properties of bi-warped product submanifolds in specific geometric spaces.
problem Characterize geometric properties of bi-warped product submanifolds.
method Analyze squared norm of second fundamental form and warping functions.
result Relationship between squared norm and warping functions for proper slant submanifolds.
Classifies special submanifolds with specific curvature properties.
problem Classifying submanifolds with constant Moebius curvature and flat normal bundle.
method Analyzes isometric immersions with constant Moebius curvature and flat normal bundle.
result Classifies submanifolds with these curvature properties.
In the present paper first, we define the conformal Sasakian manifolds and then we study geometry of invariant, anti-invariant and CR-submanifolds of conformal Sasakian manifolds.
Paper classifies 3D conformally flat quasi-Para-Sasakian manifolds.
problem Characterizing 3D conformally flat quasi-Para-Sasakian manifolds.
method Provided necessary and sufficient conditions for conformal flatness and characterized manifolds with η=const.
result Characterization of 3D conformally flat quasi-Para-Sasakian manifolds with η=const.
A conformal structure on a manifold Mn induces natural second order conformally invariant operators, called Möbius and Laplace structures, acting on specific weight bundles of M, provided that n≥3. By extending the notions of Möbius and Laplace structures to the case of surfaces and curves, we develop here th…
The article classifies G2-structures with conformally flat metrics.
problem Identifying G2-structures with specific geometric properties.
method Classifying closed G2-structures with conformally flat metrics.
result Any closed G2-structure with conformally flat metric is locally equivalent to one of three explicit examples.
No stable minimal submanifolds in certain conformal domains.
problem Stability of minimal submanifolds in conformal domains.
method Analyzing sectional curvatures and boundary convexity.
result No compact stable free boundary minimal submanifolds exist.