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The space of all Riemannian metrics is infinite-dimensional. Nevertheless a great deal of usual Riemannian geometry can be carried over. The superspace of all Riemannian metrics shall be endowed with a class of Riemannian metrics; their…

广义相对论与量子宇宙学 · 物理学 2007-05-23 H. -J. Schmidt

This study uses very simple symmetry and consistency considerations to put constraints on possible Friedmann equations for modified gravity models in curved spaces. As an example, it is applied to loop quantum cosmology.

广义相对论与量子宇宙学 · 物理学 2016-06-21 Linda Linsefors , Aurelien Barrau

In this contribution, we suggest the approach that geometric concepts ought to be defined in terms of physical operations involving quantum matter. In this way it is expected that some (presumably nocive) idealizations lying deep within the…

广义相对论与量子宇宙学 · 物理学 2009-07-24 C. Chryssomalakos , H. Hernandez-Coronado , E. Okon

We set up a model for reasoning about metric spaces with belief theoretic measures. The uncertainty in these spaces stems from both probability and metric. To represent both aspect of uncertainty, we choose an expected distance function as…

人工智能 · 计算机科学 2012-07-02 Seunghwan Lee

In this contribution we use the model of discrete spaces that we have put forward in former articles to give an interpretation to the phenomena of quantum entanglement and quantum states reduction that rests upon a new way of considering…

综合物理 · 物理学 2012-09-11 Pierre Peretto

These informal notes deal with some basic properties of metric spaces, especially concerning lengths of curves.

度量几何 · 数学 2007-09-27 Stephen Semmes

Spacetime geometry is supposed to be measured by identifying the trajectories of free test particles with geodesics. In practice, this cannot be done because, being described by Quantum Mechanics, particles do not follow trajectories. As a…

广义相对论与量子宇宙学 · 物理学 2015-06-04 Yuri Bonder

An enquiry into the physical nature of time and space and into the ontology of quantum mechanics from a metageometric perspective, resulting from the belief that geometric thought and language are powerless to farther understanding of these…

广义相对论与量子宇宙学 · 物理学 2008-04-24 Diego Meschini

We introduce an algorithm which can be directly used to feasible and optimum search in linear programming. Starting from an initial point the algorithm iteratively moves a point in a direction to resolve the violated constraints. At the…

最优化与控制 · 数学 2023-12-05 Denys Shcherbak , Natalya Pya Arnqvist

In this letter we briefly investigate the mathematical structure of space-time in the framework of discretization. It is shown that the discreteness of space-time may result in a new mechanical system which differ from the usual quantum…

量子物理 · 物理学 2010-03-29 An-Wei Zhang

We prove metric rigidity for complete manifolds supporting solutions of certain second order differential systems, thus extending classical works on a characterization of space-forms. In the route, we also discover new characterizations of…

微分几何 · 数学 2009-03-06 Stefano Pigola , Michele Rimoldi

The concept of a quasi-metric space arises by relaxing the requirement of the symmetry axiom in the definition of a metric. This small variation alters several structural properties possessed by a standard metric space. This article aims to…

一般拓扑 · 数学 2025-11-21 Om Dev Singh , Anubha Jindal

A generalization of the triangle inequality is introduced by a mapping similar to a t-conorm mapping. This generalization leads us to a notion for which we use the $\star$-metric terminology. We are interested in the topological space…

一般拓扑 · 数学 2020-09-03 Seyed Mohammad Amin Khatami , Madjid Mirzavaziri

The past few years have seen a revived interest in quantum geometrical characterizations of band structures due to the rapid development of topological insulators and semi-metals. Although the metric tensor has been connected to many…

介观与纳米尺度物理 · 物理学 2023-03-07 Adrien Bouhon , Abigail Timmel , Robert-Jan Slager

The presented paper is a review of papers on the microcosm physics geometrization in the last twenty years. These papers develop a new direction of the microcosm physics. It is so-called geometric paradigm, which is alternative to the…

综合物理 · 物理学 2011-07-28 Yuri A. Rylov

Some examples from the mathematics of shape are presented that question some of the almost hidden assumptions behind results on limiting behaviour of finitary approximations to space-time. These are presented so as to focus attention on the…

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

The quantum geometry arising in Loop Quantum Gravity has been known to semi-classically lead to generalizations of length-geometries. There have been several attempts to interpret these so called twisted geometries and understand their role…

广义相对论与量子宇宙学 · 物理学 2024-08-21 Bianca Dittrich , José Padua-Argüelles

By seeing whether a Liouville type theorem holds for positive, bounded, and/or finite energy $p$-harmonic and $p$-quasiharmonic functions, we classify proper metric spaces equipped with a locally doubling measure supporting a local…

度量几何 · 数学 2023-02-15 Anders Bjorn , Jana Bjorn , Nageswari Shanmugalingam

Deformed relativistic kinematics have been considered as a way to capture residual effects of quantum gravity. It has been shown that they can be understood geometrically in terms of a curved momentum space on a flat spacetime. In this…

广义相对论与量子宇宙学 · 物理学 2022-02-18 Christian Pfeifer , José Javier Relancio

A physical metric is constructed as one that gives a coordinate independent result for the time delay in infinite order in the perturbation expansion in the gravitational constant. A compact form for the metric is obtained. One result is…

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