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arXiv research

A locally-built, LLM-digested index of recent arXiv papers in quant finance, geometry/topology, and statistical ML — keyword search served straight from SQLite on this machine.

169,236 papers · 148 categories

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50100149199 · Jun 202019922001200920182026
48 results for orthotoric metric

Researchers describe a method to construct Ricci-flat metrics on a specific surface.

problem Constructing Ricci-flat metrics on a del Pezzo surface.
method Developed a framework and explicitly constructed the first-order deformation of the orthotoric metric.
result The deformation of the conformal Killing-Yano form does not exist.

We present a classification of compact Kaehler manifolds admitting a hamiltonian 2-form (which were classified locally in part I of this work). This involves two components of independent interest. The first is the notion of a rigid hamiltonian torus action. This natural condition, for torus actions on a Kaehler manifo…

2004-01-23abs ↗pdf ↗

Study on existence of weighted extremal Kähler metrics on projective bundles.

problem Existence of weighted extremal Kähler metrics on projective bundles.
method General existence result for weighted extremal metrics on admissible projective bundles.
result Existence of conformally Kähler, Einstein-Maxwell metrics of complex dimension m>2m>2.

Study of complex 3-folds with vanishing Bismut Ricci form via special Kähler geometry.

problem Characterizing non-Kähler BHE 3-folds with vanishing Bismut Ricci form.
method Dimensional reduction to special Kähler geometry, solving 6th order PDE, momentum map interpretation.
result Characterization of Samelson locally homogeneous BHE 3-folds and construction of new non-Kähler BHE structures.

Study on conditions for Randers metrics to be of constant Ricci curvature.

problem Conditions for Randers metrics to be of constant Ricci curvature.
method Analysis of sufficient and necessary conditions for Randers metrics with and without strong convexity.
result Classification of Randers metrics with βα>1\|β\|_α>1 and βα1\|β\|_α\equiv1.

We prove the equivalences of several classical complete metrics on the Teichmüller and the moduli spaces of Riemann surfaces. We use as bridge two new Kähler metrics, the Ricci metric and the perturbed Ricci metric and prove that the perturbed Ricci metric is a complete Kähler metric with bounded negative holomorphic s…

2004-03-03abs ↗pdf ↗

Study on geodesics of Finsler metrics derived from Riemannian metrics.

problem Investigating geodesics in Finsler metrics derived from Riemannian metrics.
method Proved geodesic lemma for a family of Riemannian geodesic orbit metrics, analyzed geodesic graphs.
result Derived Finsler metrics have geodesic orbit property and belong to a new class of metrics.

Paper examines conditions for singular square metrics to have constant curvature.

problem Conditions for constant curvature in singular square metrics.
method Analyzes Finsler metrics, introduces singular square metrics, provides necessary and sufficient conditions.
result Necessary and sufficient conditions for constant Ricci or flag curvature in singular square metrics.

New Kähler metrics generalize Calabi's and relate to Fano manifolds.

problem Existence of extremal Kähler metrics on Fano manifolds.
method Introducing σσ-extremal Kähler metrics and relating them to multiplier Hermitian-Einstein metrics.
result Existence of σσ-extremal Kähler metrics implies existence of multiplier Hermitian-Einstein metrics on Fano manifolds.

New Finsler metrics defined by Riemannian and 1-forms are studied.

problem Characterize and study properties of (α,β,γ)(α,β,γ)-metrics.
method Introduced and defined (α,β,γ)(α,β,γ)-metrics, analyzed their properties, and found conditions for local projective flatness and Douglas type.
result Necessary and sufficient conditions for (α,β,γ)(α,β,γ)-metrics to be locally projectively flat and Douglas type were found.

The paper examines (α,β)(α,β)-metrics and proves they are Berwald metrics under certain conditions.

problem Characterizing (α,β)(α,β)-metrics of weak Landsberg type.
method Analyzing properties of (α,β)(α,β)-metrics, proving conditions for weak Landsberg metrics to be Berwald.
result Every weak Landsberg (α,β)(α,β)-metric is a Berwald metric when ββ is closed and conformal.

Study on special Finsler metrics with conditions for Riemannian and isotropic properties.

problem Characterizing Finsler metrics with specific geometric properties.
method Analyzing conditions for Riemannian and isotropic properties of AR-Finsler metrics.
result Conditions for isotropic SS-curvature and mean Landsberg curvature leading to vanishing curvature.

Survey of spectral, probabilistic, and deep metric learning methods.

problem Developing effective distance metrics for various machine learning tasks.
method Divided into spectral, probabilistic, and deep approaches, covering various techniques and their applications.
result Comprehensive overview of metric learning methods, including new developments and applications.

Study shows convergence of Lagrangian submanifolds under certain metrics.

problem Understanding convergence of Lagrangian submanifolds under specific metrics.
method Proves convergence to an embedded Lagrangian submanifold using a monotonicity lemma applied on a carefully-chosen metric ball.
result Convergence to an embedded Lagrangian submanifold implies convergence in the Hausdorff metric for a class of metrics.

In this paper, we study an important class of Finsler metrics--square metrics. We give two expressions of such metrics in terms of a Riemannian metric and a 1-form. We show that Einstein square metrics can be classified up to the classification of Einstein Riemannian metrics.

2012-09-18abs ↗pdf ↗

The study characterizes Finsler metrics and proves their rigidity.

problem Characterizing and proving rigidity of Busemann convex Finsler metrics.
method Proving Finsler metrics are nonpositively curved if and only if they are affinely equivalent to a Riemannian metric of nonpositive sectional curvature.
result Finsler metrics are precisely Berwald metrics of nonpositive flag curvature.

Proposes a method to select fair performance metrics through metric elicitation.

problem Choosing fair performance metrics in multiclass classification with multiple sensitive groups.
method Metric elicitation strategy that requires only relative preference feedback and is robust to noise.
result Elicits group-fair performance metrics for multiclass classification problems.

Douglas metrics are metrics with vanishing Douglas curvature which is an important projective invariant in Finsler geometry. To find more Douglas metrics, in this paper we consider a class of Finsler metrics called general (α,β)(α,β)-metrics, which are defined by a Riemannian metric α=aij(x)yiyjα=\sqrt{a_{ij}(x)y^iy^j} and a 11-fo…

2016-06-26abs ↗pdf ↗

In this paper, we give two classes of positive semi-definite metrics on 2-manifolds. The one is called a class of Kossowski metrics and the other is called a class of Whitney metrics: The pull-back metrics of wave fronts which admit only cuspidal edges and swallowtails in R3\boldsymbol{R}^3 are Kossowski metrics, and t…

2014-09-01abs ↗pdf ↗

In this paper, we introduce the notion of Einstein-reversibility for Finsler met- rics. We study a class of p-power Finsler metrics determined by a Riemann metric and 1-form which are of Einstein-reversibility. It shows that such a class of Finsler metrics of Einstein-reversibility are always Einstein metrics. In parti…

2013-10-13abs ↗pdf ↗

Introduces new metric for Riemannian metrics, extending unbalanced optimal transport.

problem Extending unbalanced optimal transport to Riemannian metrics.
method Dynamic and static formulations of unbalanced optimal transport on Riemannian metrics.
result Wasserstein--Ebin metric provides a new Riemannian structure on the space of Riemannian metrics.

The paper explores learning metrics in low dimensions with bounds and complexities.

problem Learning metrics in low dimensions with bounds and complexities.
method Develops upper and lower bounds on generalization error, quantifies sample complexity, and bounds accuracy relative to the true metric.
result Novel mathematical approaches to metric learning and insights into ordinal embedding.

In this paper, we study generalized Douglas-Weyl (α,β)(α, β)-metrics. Suppose that an regular (α,β)(α, β)-metric FF is not of Randers type. We prove that FF is a generalized Douglas-Weyl metric with vanishing S-curvature if and only if it is a Berwald metric. Moreover by ignoring the regularity, if FF is not a Berwald met…

2015-10-26abs ↗pdf ↗

The paper introduces two new metrics on outer space and shows fixed points for their actions.

problem Analyzing metrics on outer space and their geometric group theory implications.
method Defined and analyzed entropy and pressure metrics on outer space, comparing to Weil-Petersson metric.
result For rank r4r \geq 4, the metrics have fixed points in their actions on outer space.