翻訳と辞書
Words near each other
・ Shapley Town House
・ Shapley value
・ Shapley-Ames Catalog
・ Shapley–Folkman lemma
・ Shapley–Sawyer Concentration Class
・ Shape (song)
・ Shape analysis
・ Shape analysis (digital geometry)
・ Shape analysis (program analysis)
・ Shape and form (visual arts)
・ Shape ApS
・ Shape Arts
・ Shape coding
・ Shape context
・ Shape correction function
Shape dynamics
・ Shape extension
・ Shape factor
・ Shape factor (image analysis and microscopy)
・ Shape grammar
・ SHAPE High School
・ Shape moiré
・ Shape note
・ Shape of Despair
・ Shape of Despair (album)
・ Shape of My Heart
・ Shape of My Heart (disambiguation)
・ Shape of My Heart (Noah and the Whale song)
・ Shape of the distribution
・ Shape of the Moon


Dictionary Lists
翻訳と辞書 辞書検索 [ 開発暫定版 ]
スポンサード リンク

Shape dynamics : ウィキペディア英語版
Shape dynamics

In theoretical physics Shape Dynamics is a theory of gravity that implements Mach's principle. Shape dynamics is dynamically equivalent to the canonical formulation of General Relativity, known as the ADM formalism. Shape dynamics is not formulated as an implementation of spacetime diffeomorphism invariance, but as an implementation of spatial relationalism based on spatial diffeomorphisms and spatial Weyl symmetry. An important consequence of shape dynamics is the absence of a problem of time in canonical quantum gravity. The replacement of the spacetime picture with a picture of evolving spatial conformal geometry opens the door for a number of new approaches to quantum gravity.
==Background==

Mach's principle has been an important inspiration for the construction of general relativity, but the physical interpretation of Einstein's formulation of general relativity still requires external clocks and rods and thus fails to be manifestly relational. Mach's principle would be fully implemented if the predictions of general relativity were independent of the choice of clocks and rods. Barbour and Bertotti conjectured that Jacobi's principle and a mechanism they called best matching were construction principles for a fully Machian theory. Barbour implemented these principles in collaboration with Niall O Murchadha, Edward Anderson, Brendan Foster and Bryan Kelleher to derive the ADM formalism in constant mean curvature gauge. This did not implement Mach's principle, because the predictions of general relativity in constant mean curvature gauge depend on the choice of clocks and rods. Mach's principle was successfully implemented by a young group around Perimeter Institute researcher Tim Koslowski.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Shape dynamics」の詳細全文を読む



スポンサード リンク
翻訳と辞書 : 翻訳のためのインターネットリソース

Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.