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arXiv 2212.04562gr-qc
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通过参数化场论的规范化通往引力理论的路径

Paths to gravitation via the gauging of parameterized field theories

University of Tartu(塔尔图大学);National Institute of Chemical Physics and Biophysics(国家化学物理与生物物理研究所);University Of Gdańsk(格但斯克大学)

Tomi S Koivisto, Tom Zlosnik

AI总结:

本文通过将参数化场论的全局对称性提升为局域规范对称性,探索通往引力理论的路径,提出基于局域洛伦兹对称性的模型是广义相对论的扩展,可引入时间标准并允许特定时空存在。

摘要:

在狭义相对论物理学中,时空充满了固定的非动力学度规张量。通往引力理论的一条路径是将该张量提升为真正的动力学场。狭义相对论物理学的另一种描述不涉及固定几何,而是包含标量场$X^{I}(x^{\boldsymbol{\nu}})$,这些标量场在动力学上可呈现为时空的惯性坐标。这为引力研究提供了另一种思路:通过引入规范场,将$X^{I}$在全局庞加莱变换下的作用量不变性提升为局域庞加莱或局域洛伦兹对称性。本文讨论了由此得到的引力理论与广义相对论的共性及差异。研究表明,基于局域洛伦兹对称性的模型是广义相对论的扩展,它能在引力场动力学中引入时间标准,且尽管引力规范场具有非零曲率,仍允许闵可夫斯基度规或平坦欧几里得符号度规描述的时空存在。

英文摘要:

In special-relativistic physics, spacetime is imbued with a fixed, non-dynamical metric tensor. A path to gravitational theory is to promote this tensor to a genuine dynamical field. An alternative description of special-relativistic physics involves no fixed geometry but instead the inclusion of scalar fields $X^{I}(x^μ)$ which dynamically may take the form of inertial coordinates in spacetime. This suggests an alternative approach to gravity where the invariance of actions under global Poincaré transformations of $X^{I}$ is promoted to either a local Poincaré or local Lorentz symmetry via the introduction of gauge fields. Points of commonality and departure of the resulting gravitational theories as compared to General Relativity are discussed. It is shown that the model based on local Lorentz symmetry is an extension of General Relativity that can introduce a standard of time into the dynamics of the gravitational field and allows for spacetimes described by a Minkowski metric or flat Euclidean signature metric despite the gravitational gauge field possessing non-zero curvature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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