Results 21 to 30 of about 66,332 (273)
Universe, 2020 Gravity can be formulated as a gauge theory by combining symmetry principles and geometrical methods in a consistent mathematical framework. The gauge approach to gravity leads directly to non-Euclidean, post-Riemannian spacetime geometries, providing ...
Francisco Cabral +2 more
doaj +1 more source
Modification of the mean free path of very high-energy photons due to a relativistic deformed kinematics [PDF]
The European Physical Journal Plus, 2021 Ultra-high-energy physics is about to enter a new era thanks to the impressive results of experiments such as the Large High Altitude Air Shower Observatory, detecting photons of up to 1.4×1015\documentclass[12pt]{minimal} \usepackage{amsmath ...
J. Carmona +4 more
semanticscholar +1 more source
Thought experiment discriminating special relativity from preferred frame theories
Journal of Physics Communications, 2018 In relativistic theories the effect of nonconservation of simultaneity can be separated from that of the Lorentz-Fitzgerald contraction. Since with absolute synchronization simultaneity is conserved, we show that a simple kinematic test may discriminate ...
G. Spavieri +2 more
semanticscholar +1 more source
The Physical Role of Gravitational and Gauge Degrees of Freedom in General Relativity - I: Dynamical Synchronization and Generalized Inertial Effects [PDF]
, 2004 This is the first of a couple of papers in which, by exploiting the capabilities of the Hamiltonian approach to general relativity, we get a number of technical achievements that are instrumental both for a disclosure of \emph{new} results concerning ...
Lusanna, L., Pauri, M.
core +2 more sources
Observers' measurements in premetric electrodynamics I: Time and radar length
, 2018 The description of an observer's measurement in general relativity and the standard model of particle physics is closely related to the spacetime metric. In order to understand and interpret measurements, which test the metric structure of the spacetime,
Gürlebeck, Norman, Pfeifer, Christian
core +1 more source
Spacetime, General Covariance, Dirac-Bergmann Observables and Non-Inertial Frames
, 2002 Talk at the 25th Johns Hopkins Workshop "2001: A Relativistic Spacetime Odyssey", Firenze September 2001.Comment: 23 ...
Lusanna, Luca
core +2 more sources
The Equivalence Principle Revisited [PDF]
, 2002 A precise formulation of the strong Equivalence Principle is essential to the understanding of the relationship between gravitation and quantum mechanics.
Aldrovandi, R. +2 more
core +2 more sources
Moving in the Dark: Enlightening the Spatial Population Ecology of European Cave Salamanders
Population Ecology, EarlyView.We assessed individual interactions, movement ecology and activity patterns of a subterranean population of Speleomantes strinatii, applying spatial capture–recapture modeling to a photographic dataset of 104 individuals. ABSTRACT Space use and movement are fundamental aspects of organisms' ecology, mirroring individual fitness, behavior, and life ...
Giacomo Rosa +2 more
wiley +1 more source
Resource Letter PTG-1: Precision Tests of Gravity
, 2010 This resource letter provides an introduction to some of the main current topics in experimental tests of general relativity as well as to some of the historical literature. It is intended to serve as a guide to the field for upper-division undergraduate
Will, Clifford M.
core +1 more source
Causality and the speed of sound [PDF]
, 2007 A usual causal requirement on a viable theory of matter is that the speed of sound be at most the speed of light. In view of various recent papers querying this limit, the question is revisited here.
A. Ranfagni +17 more
core +2 more sources