8 papers
The Harmonic Variational Principle for the Einstein-Hilbert Functional
Sergey Stepanov, Irina Tsyganok
Let (M,g) be a compact n-dimensional Riemannian manifold, n>2. We introduce a restricted variational principle for the Einstein-Hilbert functional by requiring the admissible metri…
A Restricted Chen-Nagano Variational Principle for the Einstein-Hilbert Functional
Sergey Stepanov, Irina Tsyganok
This paper introduces a restricted Chen-Nagano variational principle for the Einstein-Hilbert functional on compact Riemannian manifolds. Instead of considering arbitrary symmetric…
An Inequality Comparing the Dirichlet Energy and the Bienergy of Maps Between Riemannian Manifolds
Sergey Stepanov, Irina Tsyganok
We establish a geometric inequality relating the Dirichlet energy and the bienergy of smooth maps \[ f : (M,g) \to (\overline{M},\overline{g}) \] between Riemanni…
Extensions and Applications of Stein-Weiss Operators to the Study of Traceless Symmetric Tensors
Sergey Stepanov, Irina Tsyganok
First-order differential operators arising from the representation-theoretic decomposition of the covariant derivative play a central role in Riemannian geometry. In this paper, we…
Back to harmonic mappings of compact Riemannian manifolds
Sergey Stepanov, Irina Tsyganok
In this paper, we address several interconnected problems in the theory of harmonic maps between Riemannian manifolds. First, we present necessary background and establish one of t…
Geometric Interpretations and Applications of the Berger-Ebin and York -Orthogonal Decompositions
Sergey Stepanov, Irina Tsyganok
The Berger-Ebin and York -orthogonal decompositions of the vector space of symmetric bilinear differential two-forms are fundamental tools in global Riemannian geometry. In th…