Analysis on Differentiable Manifolds

A special issue of Mathematics (ISSN 2227-7390). This special issue belongs to the section "B: Geometry and Topology".

Deadline for manuscript submissions: 20 August 2025 | Viewed by 431

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Department of Mathematics, West University of Timişoara, 300223 Timişoara, Romania
Interests: Ricci-Bourguignon solitons; statistical manifolds; polynomial structures and affine connections in generalized geometry; warped product and slant submanifolds; magnetic and biharmonic curves and surfaces; multisymplectic structures
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Dear Colleagues,

An important problem in submanifold theory consists of finding optimal inequalities which relate extrinsic to intrinsic invariants for submanifolds in different ambient manifolds (endowed with polynomial structures and affine connections). Such invariants and inequalities have many applications in several areas of mathematics and related sciences. Minimal surfaces are known to be good mathematical models for physical phenomena, having been intensively studied in general relativity (black holes), cell biology (the endoplasmic reticulum), soap films, and materials science.

Geometric flows on (pseudo-)Riemannian manifolds are usually associated with extrinsic or intrinsic curvatures. One of the most studied flows is the Ricci flow introduced by Hamilton, whose self-similar solutions are Ricci solitons, which constitute natural generalizations of Einstein metrics. Another generalization of Einstein manifolds is the quasi-Einstein manifolds, important in the general theory of relativity, e.g., Robertson–Walker spacetime.

This Special Issue aims to collect reviews or research papers on topics concerning the geometry and topology of manifolds and submanifolds, as well as applications in mathematics or other scientific areas. Such topics can include, but are not limited to the following: manifolds with polynomial structures, (pseudo-)Riemannian metrics, and affine connections; distributions, foliations, and submanifolds; distinguished vector fields, vector bundles, and fiber bundles; geometric flows and solitons; spacetimes, etc.

Dr. Adara M. Blaga
Guest Editor

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Keywords

  • differentiable manifold
  • (pseudo-)Riemannian metric
  • submanifold
  • curvature
  • optimal inequalities
  • affine connection
  • polynomial structure
  • quasi-Einstein manifold
  • spacetime
  • geometric flow
  • soliton
  • vector field
  • fiber bundle
  • vector distribution
  • foliations

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Published Papers (1 paper)

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Research

33 pages, 458 KiB  
Article
Recent Developments in Chen’s Biharmonic Conjecture and Some Related Topics
by Bang-Yen Chen
Mathematics 2025, 13(9), 1417; https://doi.org/10.3390/math13091417 - 25 Apr 2025
Viewed by 243
Abstract
The study of biharmonic submanifolds in Euclidean spaces was introduced in the middle of the 1980s by the author in his program studying finite-type submanifolds. He defined biharmonic submanifolds in Euclidean spaces as submanifolds whose position vector field (x) satisfies the [...] Read more.
The study of biharmonic submanifolds in Euclidean spaces was introduced in the middle of the 1980s by the author in his program studying finite-type submanifolds. He defined biharmonic submanifolds in Euclidean spaces as submanifolds whose position vector field (x) satisfies the biharmonic equation, i.e., Δ2x=0. A well-known conjecture proposed by the author in 1991 on biharmonic submanifolds states that every biharmonic submanifold of a Euclidean space is minimal, well known today as Chen’s biharmonic conjecture. On the other hand, independently, G.-Y. Jiang investigated biharmonic maps between Riemannian manifolds as the critical points of the bi-energy functional. In 2002, R. Caddeo, S. Montaldo, and C. Oniciuc pointed out that both definitions of biharmonicity of the author and G.-Y. Jiang coincide for the class of Euclidean submanifolds. Since then, the study of biharmonic submanifolds and biharmonic maps has attracted many researchers, and many interesting results have been achieved. A comprehensive survey of important results on this conjecture and on many related topics was presented by Y.-L. Ou and B.-Y. Chen in their 2020 book. The main purpose of this paper is to provide a detailed survey of recent developments in those subjects after the publication of Ou and Chen’s book. Full article
(This article belongs to the Special Issue Analysis on Differentiable Manifolds)
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