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We obtain a compactness result for various classes of Riemannian metrics in dimension four; in particular our method applies to anti-self-dual metrics, Kahler metrics with constant scalar curvature, and metrics with harmonic curvature. With…

微分几何 · 数学 2009-08-26 Jeff Viaclovsky , Gang Tian

In the compact setting, Aazami and Ream \cite{Aazami:2022th} proved that Riemannian metrics dual to a class of Lorentzian metrics, called (compact) general plane-fronted waves, are almost-K\"ahler. In this note, we explain how to construct…

微分几何 · 数学 2022-08-02 Mehdi Lejmi , Xi Sisi Shen

We prove metric differentiation for differentiability spaces in the sense of Cheeger. As corollaries we give a new proof that the minimal generalized upper gradient coincides with the pointwise Lipschitz constant for Lipschitz functions on…

度量几何 · 数学 2016-02-12 Jeff Cheeger , Bruce Kleiner , Andrea Schioppa

This is the second in a series of papers where we prove a conjecture of Deser and Schwimmer regarding the algebraic structure of ``global conformal invariants''; these are defined to be conformally invariant integrals of geometric scalars.…

微分几何 · 数学 2009-12-21 Spyros Alexakis

We make plausible the existence of counterexamples to the Riemann hypothesis located in the neighbourhood of unusually large peaks of $\vert \zeta \vert$. The main ingredient in our argument is an identity which links the zeros of a…

数论 · 数学 2017-07-07 Philippe Blanc

Bipartite Riemann-Finsler geometries with complementary Finsler structures are constructed. Calculable examples are presented based on a bilinear-form coefficient for explicit Lorentz violation.

高能物理 - 理论 · 物理学 2012-09-17 Alan Kostelecky , Neil Russell , Rhondale Tso

We derive an efficient CH-type inequality. Quantum mechanics violates our proposed inequality independent of the detection-efficiency problem.

量子物理 · 物理学 2009-11-10 Afshin Shafiee

A four-dimensional differentiable manifold is given with an arbitrary linear connection $\Gamma_\alpha^\beta=\Gamma_{i\alpha}^\beta dx^i$. Megged has claimed that he can define a metric $G_{\alpha\beta}$ by means of a certain integral…

广义相对论与量子宇宙学 · 物理学 2007-05-23 Friedrich W. Hehl , Uwe Muench

In this paper I present a comparison theorem for the waist of Riemannian manifolds with positive sectional curvature. The main theorem of this paper gives a partial positive answer to a conjecture formulated by M.Gromov in [8]. The content…

度量几何 · 数学 2013-12-04 Yashar Memarian

We introduce an analog of the Kobayashi-Royden metric on a Riemannian manifold and study its basic properties.

复变函数 · 数学 2023-07-13 Hervé Gaussier , Alexandre Sukhov

For a complete Riemannian manifold $M$ with an (1,1)-elliptic Codazzi self-adjoint tensor field $A$ on it, we use the divergence type operator ${L_A}(u): = div(A\nabla u)$ and an extension of the Ricci tensor to extend some major comparison…

微分几何 · 数学 2019-02-13 S. H. Fatemi , S. Azami

We study some basic properties and examples of Hermitian metrics on complex manifolds whose traces of the curvature of the Chern connection are proportional to the metric itself.

微分几何 · 数学 2020-07-22 Daniele Angella , Simone Calamai , Cristiano Spotti

An alternative interpretation of the conformal transformations of the metric is discussed according to which the latter can be viewed as a mapping among Riemannian and Weyl-integrable spaces. A novel aspect of the conformal transformation's…

广义相对论与量子宇宙学 · 物理学 2013-01-29 Israel Quiros , Ricardo Garcia-Salcedo , Jose Edgar Madriz Aguilar , Tonatiuh Matos

We investigate extremal metrics at which various types of rigidity theorems involving scalar curvatures hold. The rigidity we discuss here is related to the rigidity theorems presented by Mario Listing in his previous preprint. More…

微分几何 · 数学 2026-04-08 Shota Hamanaka

In this thesis, we study connections between metric and combinatorial graphs from a Dirichlet space point of view.

数学物理 · 物理学 2017-05-19 Sebastian Haeseler

The existence of a median-type ternary operation on a metric space is known to have a number of implications for the geometry of the space. For such operations, if two of the three arguments coincide, they also coincide with the output of…

度量几何 · 数学 2024-12-10 Leonid V. Kovalev

Over the past six years, a detailed framework has been constructed to unravel the quantum nature of the Riemannian geometry of physical space. A review of these developments is presented at a level which should be accessible to graduate…

广义相对论与量子宇宙学 · 物理学 2007-05-23 Abhay Ashtekar

In this paper, we construct metallic K\"ahler and nearly metallic K\"ahler structures on Riemanian manifolds. For such manifolds with these structures, we study curvature properties. Also we describe linear connections on the manifold,…

综合数学 · 数学 2019-07-02 Sibel Turanli , Aydin Gezer , Hasan Cakicioglu

We present several applications of matrix-theoretic inequalities to the magnitude of metric spaces. We first resolve an open problem by showing that the magnitude of any finite metric space of negative type is less than or equal to its…

度量几何 · 数学 2025-09-30 Kiyonori Gomi , Mark Meckes

In this note we give new proofs of rectifiability of RCD(K,N) spaces as metric measure spaces and lower semicontinuity of the essential dimension, via $\delta$-splitting maps. The arguments are inspired by the Cheeger-Colding theory for…

度量几何 · 数学 2020-01-23 Elia Bruè , Enrico Pasqualetto , Daniele Semola