Results 31 to 40 of about 76,072 (261)
Functorial Evolution of Quantum Fields
Frontiers in Physics, 2021 We present a compositional algebraic framework to describe the evolution of quantum fields in discretised spacetimes. We show how familiar notions from Relativity and quantum causality can be recovered in a purely order-theoretic way from the causal ...
Stefano Gogioso +2 more
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The relativity of relative risks: disadvantage or opportunity? [PDF]
British Journal of Psychiatry, 2003 Psychiatric epidemiologists use many tools, such as relative risks and the related odds ratios, that were developed to study chronic somatic disease. Cancer epidemiologists identify as a major advantage of relative risks that, when appropriately adjusted for confounding and effect modification ...
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Relative torsion classes, relative tilting, and relative silting modules
Communications in Algebra, 2021 Let $Λ$ be an Artin algebra. In 2014, T. Adachi, O. Iyama and I. Reiten proved that the torsion funtorially finite classes in $\mathrm{mod}\,(Λ)$ can be described by the $τ$-tilting theory. The aim of this paper is to introduce the notion of $F$-torsion class in $\mathrm{mod}\,(Λ)$, where $F$ is an additive subfunctor of $\mathrm{Ext}^1_Λ,$ and to ...
Luis Armando Martínez González +1 more
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Strong-Coupled Relativity Without Relativity [PDF]
General Relativity and Gravitation, 2004 GR can be interpreted as a theory of evolving 3-geometries. A recent such formulation, the 3-space approach of Barbour, Foster and Ó Murchadha, also permits the construction of a limited number of other theories of evolving 3-geometries, including conformal gravity and strong gravity.
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First-Order Logic Foundation of Relativity Theories [PDF]
, 2006 Motivation and perspective for an exciting new research direction interconnecting logic, spacetime theory, relativity--including such revolutionary areas as black hole physics, relativistic computers, new cosmology--are presented in this paper.
X. Madarasz, Judit +5 more
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RELATIVITY GROUPOID INSTEAD OF RELATIVITY GROUP [PDF]
International Journal of Geometric Methods in Modern Physics, 2007 In 1908, Minkowski [13] used space-like binary velocity-field of a medium, relative to an observer. In 1974, Hestenes introduced, within a Clifford algebra, an axiomatic binary relative velocity as a Minkowski bivector [7, 8]. We propose to consider binary relative velocity as a traceless nilpotent endomorphism in an operator algebra. Any concept of a
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Einstein Geometrization Philosophy and Differential Identities in PAP-Geometry
Advances in Mathematical Physics, 2016 The importance of Einstein’s geometrization philosophy, as an alternative to the least action principle, in constructing general relativity (GR), is illuminated. The role of differential identities in this philosophy is clarified.
M. I. Wanas +3 more
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Why Einstein did not believe that General Relativity geometrizes gravity [PDF]
, 2013 I argue that, contrary to folklore, Einstein never really cared for geometrizing the gravitational or (subsequently) the electromagnetic field; indeed, he thought that the very statement that General Relativity geometrizes gravity "is not saying anything
Lehmkuhl, D, Lehmkuhl, Dennis
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STABILITY OF STELLAR SYSTEMS ORBITING SGR A*
Odessa Astronomical Publications, 2016 Path equations of different orbiting objects in the presence of very strong gravitational fields are essential to examine the impact of its gravitational effect on the stability of each system.
Magd E. Kahil
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Unifying the Galilei Relativity and the Special Relativity [PDF]
ISRN Mathematical Physics, 2013 We present two models combining some aspects of the Galilei and the Special relativities that lead to a unification of both relativities. This unification is founded on a reinterpretation of the absolute time of the Galilei relativity that is considered as a quantity in its own and not as mere reinterpretation of the time of the Special relativity in ...
Alexandre Lyra, Marcelo Carvalho
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