Geometrodynamics of variable-speed-of-light cosmologies
Geometrodynamics of variable-speed-of-light cosmologies
复制标题
可变光速宇宙学的几何动力学
DOI：
10.1103/physrevd.62.103518
复制
发表时间：
2000
影响因子：
5
通讯作者：
M. Visser
中科院分区：
文献类型：
--
作者：
B. Bassett;S. Liberati;C. Molina‐París;M. Visser
光速可变(VSL)宇宙学目前正吸引着人们的兴趣，它是一种替代膨胀的方法。我们研究了VSL宇宙学的基本几何动力学方面，并提供了几种不显式地打破洛伦兹不变性的实现(没有“硬”破缺)。洛伦兹对称破缺的这些“软”实现特别清楚地回答了“VSL关于什么？”这个问题。我们考虑的这类VSL宇宙学与经典的爱因斯坦引力和低能粒子物理都是兼容的。这些模型和膨胀一样解决了宇宙学的“运动学”难题，但它们本身不能解决平坦度问题，因为在它们的最纯粹的形式中，不会发生对强能量条件的违反。我们还考虑了一个杂性模型(VSL加暴胀)，该模型提供了一些对低红移宇宙的观测启示，如果数学{\chi}作为CDM或国粹贡献了‘’暗能量‘’。这些影响包括修正的引力透镜、双折射、基本常数的变化和来自遥远来源的光的偏振平面的旋转。
Variable-speed-of-light (VSL) cosmologies are currently attracting interest as an alternative to inflation. We investigate the fundamental geometrodynamic aspects of VSL cosmologies and provide several implementations which do not explicitly break Lorentz invariance (no ``hard'' breaking). These ``soft'' implementations of Lorentz symmetry breaking provide particularly clean answers to the question ``VSL with respect to what?.'' The class of VSL cosmologies we consider are compatible with both classical Einstein gravity and low-energy particle physics. These models solve the ``kinematic'' puzzles of cosmology as well as inflation does, but cannot by themselves solve the flatness problem, since in their purest form no violation of the strong energy condition occurs. We also consider a heterotic model (VSL plus inflation) which provides a number of observational implications for the low-redshift universe if \ensuremath{\chi} contributes to the ``dark energy'' either as CDM or quintessence. These implications include modified gravitational lensing, birefringence, variation of fundamental constants and rotation of the plane of polarization of light from distant sources.