Chameleon cosmology
Chameleon cosmology
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DOI：
10.1103/physrevd.69.044026
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发表时间：
2004-02-01
影响因子：
5
通讯作者：
Weltman, A
中科院分区：
文献类型：
--
作者：
Khoury, J;Weltman, A
宇宙加速膨胀的证据和精细结构常数的时间依赖性表明至少存在一个质量为H-0的标量场。如果这样的场存在，那么一般认为它与物质的耦合必须被调整到不自然的小值，以满足等效原理（EP）的测试。在本文中，我们提出了另一种解释，它允许标量场的宇宙演化，同时有耦合的秩序统一的问题。在我们的方案中，场的质量取决于局部物质密度：在地球上（密度高），相互作用范围通常为1 mm，在太阳系中（密度低）为10 - 10（4）Au。所有目前从广义相对论测试的界限都得到了满足。尽管如此，我们预测，不久的将来，将在太空中测试重力的实验将测量一个有效的牛顿常数，它与地球上的牛顿常数相差一个阶数，以及比目前实验室实验所允许的更强的EP违反。这些结果将构成我们设想的一个确凿证据。
The evidence for the accelerated expansion of the Universe and the time dependence of the fine-structure constant suggests the existence of at least one scalar field with a mass of order H-0. If such a field exists, then it is generally assumed that its coupling to matter must be tuned to unnaturally small values in order to satisfy the tests of the equivalence principle (EP). In this paper, we present an alternative explanation which allows scalar fields to evolve cosmologically while having couplings to matter of order unity. In our scenario, the mass of the fields depends on the local matter density: the interaction range is typically of order 1 mm on Earth (where the density is high) and of order 10-10(4) AU in the solar system (where the density is low). All current bounds from tests of general relativity are satisfied. Nevertheless, we predict that near-future experiments that will test gravity in space will measure an effective Newton's constant different by order unity from that on Earth, as well as EP violations stronger than currently allowed by laboratory experiments. Such outcomes would constitute a smoking gun for our scenario.