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3.1%6.3%9.4%12.5% · Sep 199719922001200920182026
48 results for CMC flux

We construct higher genus Riemann's minimal surfaces properly embedded in the Euclidean space. To do that we glue end by end a Costa-Hoffman-Meeks examples to two halves genus zero Riemann's minimal surfaces. In first we need to perform a deformation of a Costa-Hoffman-Meeks example to prescribe the flux vector along t…

2005-11-17abs ↗pdf ↗

Bayesian analysis uncovers flux couplings in metabolic networks.

problem Uncertainty and unrealistic assumptions in traditional flux analysis methods.
method Introduces Bayesian metabolic flux analysis to model reactions probabilistically and infer flux distributions.
result Reveals informative flux couplings and more unobserved fluxes in metabolic networks.

Study introduces a probabilistic framework for air-sea fluxes using neural networks.

problem Accurately quantifying air-sea fluxes for understanding interactions and improving weather/climate models.
method Gaussian distributions conditioned on input variables, artificial neural networks, eddy-covariance data, minimizing negative log-likelihood loss.
result Trained neural networks provide alternative mean flux estimates and quantify uncertainty.

In this paper, we introduce a non linear ODE method to construct CMC surfaces in Riemannian manifolds with symmetry. As an application we construct unstable CMC spheres and outlying CMC spheres in asymptotically Schwarzschild manifolds with metrics like gij=(1+1l)2δij+O(l2)g_{ij}=(1+\frac{1}{l})^{2}δ_{ij}+O(l^{-2}). The existence of uns…

2015-07-10abs ↗pdf ↗

Derives fluxes in M-theory compactifications and connects them to threebrane sigma-models.

problem Deriving fluxes in M-theory compactifications and understanding their geometric and topological properties.
method Systematic derivation of fluxes from higher Courant brackets and generalized geometry, relating them to threebrane sigma-models.
result Fluxes in M-theory compactifications are understood as generalized Wess-Zumino terms in threebrane sigma-models, linking higher structure to Lie algebroid homotopy.

We study the flux homomorphism for closed forms of arbitrary degree, with special emphasis on volume forms and on symplectic forms. The volume flux group is an invariant of the underlying manifold, whose non-vanishing implies that the manifold resembles one with a circle action with homologically essential orbits.

2005-03-12abs ↗pdf ↗

No proper biharmonic CMC compact hypersurface in a specific warped product space.

problem Existence of proper biharmonic CMC hypersurfaces in a warped product space.
method Finding necessary and sufficient conditions for proper biharmonic CMC hypersurfaces in a special warped product space.
result No proper biharmonic CMC compact hypersurface exists in the specified space.

We propose an extension of the structure equation for constant mean curvature (CMC) surfaces in a three dimensional Riemannian space form to the associated CMC hierarchy of evolution equations by the higher-order commuting symmetries. Via the canonical formal Killing field, considered as an infinitely prolonged and loo…

2014-09-23abs ↗pdf ↗

Study on Euler class and flux homomorphisms for non-orientable surfaces.

problem Investigate Euler class and flux homomorphisms for non-orientable surfaces.
method Analyze Euler class and flux homomorphisms for non-orientable compact surfaces with one boundary component.
result Prove the simplicity of the kernel of the flux homomorphisms, implying the non-existence of invariants analogous to the Calabi invariant.

FLUXtrapolation benchmarks machine learning for extrapolating ecosystem fluxes under distribution shifts.

problem Machine learning challenges in extrapolating ecosystem fluxes under distribution shifts.
method Defined temporal, spatial, and temperature-based extrapolation scenarios; evaluated performance across domains, temporal aggregations, and tail errors.
result Baselines perform similarly under median hourly RMSE but differ under tail-focused and multi-scale evaluations.

Combines machine learning and convex limiting for accurate subgrid flux modeling in shallow-water equations.

problem Accurate subgrid flux modeling in shallow-water equations.
method Machine learning and flux limiting for property-preserving subgrid scale modeling.
result The proposed method produces meaningful closures even in untrained scenarios.

We translate a classification scheme for periodic CMC surfaces developed by J. Dorfmeister and the author to discrete CMC surfaces in the sense of A. Bobenko and U. Pinkall. The scheme uses the dressing action on discrete CMC surfaces to arrive at a classification for periodic discrete CMC surfaces.

1997-11-21abs ↗pdf ↗

Compactness proven for CMC surfaces with bounded topology and boundary length.

problem Proving compactness of CMC surfaces with specific constraints.
method Graphical CkC^k compactness proof for surfaces with bounded topology, area, and boundary length.
result Space of free boundary CMC surfaces is compact in the CkC^k graphical sense away from a finite set of points.

Machine learning and deep learning infer surface/groundwater exchange from temperature data.

problem Inferring surface/groundwater exchange from temperature data with high temporal resolution.
method Application of machine learning and deep learning algorithms to infer surface/groundwater exchange flux from subsurface temperature observations.
result DL methods outperform ML methods in interpreting noisy temperature data, especially with a smoothing filter.

Study on flux homomorphism and its extension in symplectic group of a disk.

problem Understanding the flux homomorphism and its extension in symplectic group.
method Defined and analyzed the flux homomorphism and its extension, determined the Euler class, and investigated its relation to group 2-cocycle and Calabi invariant.
result Determined the Euler class of the flux extension and investigated its relation to group 2-cocycle and Calabi invariant.

Invariant rr^\sharp predicts H-flux behavior under T-duality.

problem Predicting H-flux behavior under T-duality on product manifolds.
method Using rr^\sharp invariant to analyze metric connections and T-duality effects.
result Invariant rr^\sharp detects irreducible H-flux components that survive T-duality.

Curvature estimates and sheeting theorems for weakly stable CMC hypersurfaces established.

problem Establishing curvature estimates and sheeting theorems for weakly stable CMC hypersurfaces.
method Pointwise curvature estimate and sheeting theorem for weakly stable CMC hypersurfaces.
result Effective version of the compactness theorem for weakly stable CMC hypersurfaces.

Study finds existence and non-existence of large stable CMC spheres in asymptotically flat 3-manifolds.

problem Existence and non-existence of large stable CMC spheres in asymptotically flat 3-manifolds.
method Extends Lyapunov-Schmidt analysis to 'far-off-center' regime and general Schwarzschild asymptotics.
result Sharp existence and non-existence results for large stable CMC spheres.

On a closed symplectic surface Sigma of genus two or more, we give a new construction of an extended flux map (a crossed homomorphism from the symplectomorphism group Symp(Sigma) to the cohomology group H^1(Sigma;R) that extends the flux homomorphism). This construction uses the topology of the Jacobian of the surface …

2008-08-12abs ↗pdf ↗

New CMC existence result for expanding cosmological spacetimes.

problem Establishing a new constant mean curvature (CMC) existence result for cosmological spacetimes.
method Construction of barriers in the support sense and asymptotic limit of mean curvature flow.
result The existence of a CMC Cauchy surface in expanding cosmological spacetimes.

A novel gravity theory based on Poisson Generalized Geometry is investigated. A gravity theory on a Poisson manifold equipped with a Riemannian metric is constructed from a contravariant version of the Levi-Civita connection, which is based on the Lie algebroid of a Poisson manifold. Then, we show that in Poisson Gener…

2015-08-24abs ↗pdf ↗

For a complete minimal surface in the Euclidean 3-space, the so-called flux vector corresponds to each end. The flux vectors are balanced, i.e., the sum of those over all ends are zero. Consider the following inverse problem: For each balanced n vectors, find an n-end catenoid which attains given vectors as flux. Here,…

1997-09-02abs ↗pdf ↗