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A positive mass theorem for General Relativity Theory is proved. The proof is 4-dimensional in nature, and relies completely on arguments pertaining to causal structure, the basic idea being that positive energy-density focuses null…

广义相对论与量子宇宙学 · 物理学 2008-02-03 R. Penrose , R. D. Sorkin , E. Woolgar

A large class of two-dimensional free-surface hydrodynamical systems is determined that can be self-consistently reduced by the condition that the velocity profile has a constant shear. The reduced systems turn out to be Hamiltonian, and so…

可精确求解与可积系统 · 物理学 2007-05-23 Boris Kupershmidt

The development of mathematically complete and consistent models solving the so-called "measurement problem", strongly renewed the interest of the scientific community for the foundations of quantum mechanics, among these the Dynamical…

In this study, we use the concept of Bohmian trajectories to present a dynamical and deterministic interpretation for the gravity induced wave function reduction. We shall classify all possible regimes for the motion of a particle, based on…

量子物理 · 物理学 2026-05-26 Faramarz Rahmani , Mehdi Golshani

Cobham's theorem asserts that if a sequence is automatic with respect to two multiplicatively independent bases, then it is ultimately periodic. We prove a stronger density version of the result: if two sequences which are automatic with…

数论 · 数学 2017-11-02 Jakub Byszewski , Jakub Konieczny

Because quantum measurements have probabilistic outcomes they can seem to violate conservation laws in individual experiments. Despite these appearances, strict conservation of momentum, orbital angular momentum, and energy can be shown to…

量子物理 · 物理学 2020-04-17 Edward J. Gillis

This paper deals with Nancy Cartwright's views on the measurement problem in Quantum Mechanics, as exposed in her book {\it{How the Laws of Physics Lie}}. She does not accept the logic of Quantum Mechanics. It is argued that her proposals,…

物理学史与哲学 · 物理学 2016-09-29 Pascal Lederer

In the language of random counting measures many structural properties of the Poisson process can be studied in arbitrary measurable spaces. We provide a similarly general treatise of Gibbs processes. With the GNZ equations as a definition…

概率论 · 数学 2024-01-09 Steffen Betsch

We critically analyse the point of view for which laws of nature are just a mean to compress data. Discussing some basic notions of dynamical systems and information theory, we show that the idea that the analysis of large amount of data by…

统计力学 · 物理学 2017-09-22 Sergio Chibbaro , Angelo Vulpiani

We introduce a new class of (dynamical) systems that inherently capture cascading effects (viewed as consequential effects) and are naturally amenable to combinations. We develop an axiomatic general theory around those systems, and guide…

离散数学 · 计算机科学 2019-03-14 Elie M. Adam , Munther A. Dahleh , Asuman Ozdaglar

Reduction is shown to be a possible consequence of the basic principles of quantum mechanics, involving no branching of the quantum state of the universe. The key feature of a measurement is attributed to the creation of macroscopic germs…

量子物理 · 物理学 2008-02-19 Roland Omnès

Understanding when linear immersions of nonlinear dynamical systems exist is important since such immersions allow us to leverage the rich tools of linear system theory to analyze nonlinear dynamics. Recently, Liu et al. (2023) showed that…

系统与控制 · 电气工程与系统科学 2026-05-15 Eron Ristich , Eduardo Sontag , Necmiye Ozay

Statistical inference can be seen as information processing involving input information and output information that updates belief about some unknown parameters. We consider the Bayesian framework for making inferences about dynamical…

统计理论 · 数学 2022-01-17 Artur O. Lopes , Silvia R. C. Lopes , Paulo Varandas

One of the consequences of the Compactness Principle in structural Ramsey theory is that the small Ramsey degrees cannot exceed the corresponding big Ramsey degrees, thereby justifying the choice of adjectives. However, it is unclear what…

逻辑 · 数学 2024-07-30 Dragan Mašulović

Learning Gibbs distributions using only sufficient statistics has long been recognized as a computationally hard problem. On the other hand, computationally efficient algorithms for learning Gibbs distributions rely on access to full sample…

机器学习 · 计算机科学 2026-02-16 Abhijith Jayakumar , Shreya Shukla , Marc Vuffray , Andrey Y. Lokhov , Sidhant Misra

In the weak-field limit of General Relativity, gravitational waves obey linear equations and propagate at the speed of light. These properties of General Relativity are supported by the observation of ultra high energy cosmic rays as well…

高能天体物理现象 · 物理学 2017-07-26 Paul M. Chesler , Abraham Loeb

In a recent paper, [Gampel, F. and Gajda, M., Phys. Rev. A 107, 012420, (2023)], the authors claimed they are proposing a new model to explain the existence of classical trajectories in the quantum domain. The idea is based on simultaneous…

量子物理 · 物理学 2023-11-14 Adélcio C. Oliveira

We study linear-time temporal logics interpreted over data words with multiple attributes. We restrict the atomic formulas to equalities of attribute values in successive positions and to repetitions of attribute values in the future or…

计算机科学中的逻辑 · 计算机科学 2019-03-14 Stephane Demri , Diego Figueira , M Praveen

In classical density (or density-functional) estimation, it is standard to assume that the underlying distribution has a density with respect to the Lebesgue measure. However, when the data distribution is a mixture of continuous and…

统计方法学 · 统计学 2025-08-05 Aytijhya Saha , Aaditya Ramdas

In these notes, we prove a recent conjecture posed in the paper by R\"ais\"a, O. et al. [Subsampling is not Magic: Why Large Batch Sizes Work for Differentially Private Stochastic Optimization (2024)]. Theorem 6.2 of the paper asserts that…

机器学习 · 计算机科学 2024-09-10 Nikita P. Kalinin