翻訳と辞書 Words near each other ・ Pressure-sensitive tape ・ Pressure-tolerant electronics ・ Pressure-volume curves ・ Pressure-volume loop analysis in cardiology ・ Pressure-volume loop experiments ・ Pressurecooker ・ Pressuremeter test ・ PressureNET ・ Pressuretrol ・ Pressurisation ductwork ・ Pressurization ・ Pressurized Mating Adapter ・ Pressurized wall ・ Pressurized water reactor ・ Pressurizer ・ Pressuron ・ PressWise ・ Presswood, California ・ Pressy ・ Pressy Button ・ Pressy-sous-Dondin ・ Press–Schechter formalism ・ Prest v Petrodel Resources Ltd ・ Prest-O Change-O ・ Prest-O-Lite Trophy Race ・ Presta valve ・ Prestahnúkur ・ PrestaShop ・ Prestat ・ Prestatyn Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Pressuron ： ウィキペディア英語版 Pressuron The pressuron is a hypothetical scalar particle which couples to both gravity and matter theorised in 2013. Although originally postulated without self-interaction potential, the pressuron is also a dark energy candidate when it has such a potential. The pressuron takes its name from the fact that it decouples from matter in pressure-less regimes,〔 allowing the scalar-tensor theory of gravity involving it to pass solar system tests, as well as tests on the equivalence principle, even though it is fundamentally coupled to matter. Such a decoupling mechanism could explain why gravitation seems to be well described by general relativity at present epoch, while it could actually be more complex than that. Because of the way it couples to matter, the pressuron is a special case of the hypothetical string dilaton. Therefore, it is one of the possible solutions to the present non-observation of various signals coming from massless or light scalar fields that are generically predicted in string theory. == Mathematical formulation == The action of the scalar-tensor theory that involves the pressuron $\backslash Phi$ can be written as :$S=\; \backslash frac\backslash int\; d^4x\; \backslash sqrt\; \backslash left(\backslash sqrt\; \backslash mathcal\_m\; (g\_,\; \backslash Psi)\; +$ \frac\left(\Phi R-\frac (\partial_\sigma \Phi)^2-V(\Phi) \right) \right ), where $R$ is the Ricci scalar constructed from the metric $g\_$, $g$ is the metric determinant, $\backslash kappa=\backslash frac$, with $G$ the gravitational constant〔Note however that it is different from the effective constant measured with Cavendish-type experiments (see also Scalar-tensor theory)〕 and $c$ the velocity of light in vacuum, $V(\backslash Phi)$ is the pressuron potential and $\backslash mathcal\_m$ is the matter Lagrangian〔See also Electroweak lagrangian and Quantum chromodynamics lagrangian〕 and $\backslash Psi$ represents the non-gravitational fields. The gravitational field equations therefore write〔 :$R\_-\backslash fracg\_R=\; \backslash kappa~\; \backslash frac+\; \backslash frac\; (\backslash nabla\_\; -g\_\backslash Box)\backslash Phi$ +\frac\left(\Phi \partial_ \Phi - \fracg_(\partial_\Phi)^2\right )-g_ \frac , and :$\backslash frac\backslash Box\; \backslash Phi=\; \backslash kappa\; \backslash frac\_m\; \backslash right)\; -\; \backslash frac\; (\backslash partial\_\backslash sigma\; \backslash Phi)^2\; +\; V\text{'}(\backslash Phi)\; -\; 2\; \backslash frac$. 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「Pressuron」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.