189 research outputs found
A Positive Mass Theorem for Manifolds with Boundary
We derive a positive mass theorem for asymptotically flat manifolds with
boundary whose mean curvature satisfies a sharp estimate involving the
conformal Green's function. The theorem also holds if the conformal Green's
function is replaced by the standard Green's function for the Laplacian
operator. As an application, we obtain an inequality relating the mass and
harmonic functions that generalizes H. Bray's mass-capacity inequality in his
proof of the Riemannian Penrose conjecture.Comment: 15 pages, to appear in Pacific J. Mat
Stability of Llarull's theorem in all dimensions
We prove stability of Llarull's theorem in all dimensions using spin
geometry. Our results are stated in terms of both intrinsic flat convergence
and convergence outside a small set.Comment: Comments welcom
The case of equality for the spacetime positive mass theorem
The rigidity of the spacetime positive mass theorem states that an initial
data set satisfying the dominant energy condition with vanishing mass
can be isometrically embedded into Minkowski space. This has been established
by Beig-Chru\'sciel and Huang-Lee under additional decay assumptions for the
energy and momentum densities and . In this note we give a new and
elementary proof in dimension 3 which removes these additional decay
assumptions. Our argument uses spacetime harmonic functions and Liouville's
theorem. We also provide an alternative proof based on the Killing development
of .Comment: Comments welcome
Holographic topometry for a dense visualization of soft tissue for facial reconstruction
Facial reconstruction can be used as a forensic technique to identify a person, when no other identification method is applicable. The facial soft tissue thickness applied to the skull is crucial when performing an accurate facial reconstruction. Historically, scientists developed several techniques to measure the soft tissue of the face. It was their aim, to build a database of a unique point-set, differentiated by gender, age, ethnic origin, BMI. All used a limited number of landmarks and an inaccurate measuring technique. We developed a contact-free and precise measuring technique, using low-dose CT and holographic data. Due to the extremely short exposure time, the holographic measurement is very precise. We lay out our first experiences to create a facial soft tissue layer map of the fac
A generalization of Geroch's conjecture
The Theorem of Bonnet--Myers implies that manifolds with topology do not admit a metric of positive Ricci curvature, while
the resolution of Geroch's conjecture implies that the torus
does not admit a metric of positive scalar curvature. In this work we introduce
a new notion of curvature interpolating between Ricci and scalar curvature (so
called -intermediate curvature), and use stable weighted slicings to show
that for the manifolds do not
admit a metric of positive -intermediate curvature.Comment: final version; to appear in Comm. Pure. Appl. Mat
causalgraph: A Python Package for Modeling, Persisting and Visualizing Causal Graphs Embedded in Knowledge Graphs
This paper describes a novel Python package, named causalgraph, for modeling
and saving causal graphs embedded in knowledge graphs. The package has been
designed to provide an interface between causal disciplines such as causal
discovery and causal inference. With this package, users can create and save
causal graphs and export the generated graphs for use in other graph-based
packages. The main advantage of the proposed package is its ability to
facilitate the linking of additional information and metadata to causal
structures. In addition, the package offers a variety of functions for graph
modeling and plotting, such as editing, adding, and deleting nodes and edges.
It is also compatible with widely used graph data science libraries such as
NetworkX and Tigramite and incorporates a specially developed causalgraph
ontology in the background. This paper provides an overview of the package's
main features, functionality, and usage examples, enabling the reader to use
the package effectively in practice
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