我们生活在一个“迪拉克-米尔恩”宇宙中吗？
Do we live in a "Dirac-Milne" universe?
摘要：
LCDM标准模型，虽然是目前宇宙学数据的一个很好的参数化，但需要两个尚未观测到的成分，暗物质和暗能量，超过95%的宇宙，以及高水平的微调。面对这种不令人满意的情况，我们研究了一种非传统的宇宙学，Dirac-Milne宇宙，一种物质-反物质对称宇宙学，其中反物质被认为是负的活动引力质量。我们表明，这个宇宙显着满足宇宙年龄，大爆炸核合成和Ia型超新星数据的宇宙学检验。最令人惊讶的是，它还提供了宇宙微波背景的第一个声学峰值的度标。这个简单的模型，没有任何可调参数，也不需要暗物质或暗能量，提醒我们应该寻找比目前的LCDM标准模型更简单和更有动力的宇宙学模型。
英文摘要：
The LCDM standard model, although an excellent parametrization of the present cosmological data, requires two as yet unobserved components, Dark Matter and Dark Energy, for more than 95% of the Universe, and a high level of fine-tuning. Faced to this unsatisfactory situation, we study an unconventional cosmology, the Dirac-Milne universe, a matter-antimatter symmetric cosmology, in which antimatter is supposed to present a negative active gravitational mass. We show that this universe remarkably satisfies the cosmological tests for the age of the Universe, Big-Bang Nucleosynthesis, and Type Ia Supernovae data. Most surprisingly, it also provides the degree scale for the first acoustic peak of the Cosmological Microwave Background. This simple model, without any adjustable parameter or need for Dark Matter or Dark Energy, is a reminder that we should look for simpler and more motivated cosmological models than the present LCDM standard model.
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