arXiv 1306.43262013-06-18astro-ph.CO

变色龙场论

Chameleon Field Theories

Justin Khoury

备注：: 19 pages, 3 figures. To appear in a Classical and Quantum Gravity focus issue on "Gravity and Scalar Fields"
DOI：: 10.1088/0264-9381/30/21/214004

摘要：

变色龙是具有显著性质的光标量场。通过自相互作用和与物质的耦合，变色龙粒子的质量取决于周围物质的密度。因此，由变色龙介导的第五种力量的表现敏感地依赖于它们的环境，这构成了丰富的现象学。在这篇文章中，我们回顾了变色龙现象学的两个最新结果。第一个结果是一对限制变色龙及其推广的宇宙学影响的不可行定理：i）今天宇宙密度下变色龙力的范围最多可以是~Mpc; ii）与爱因斯坦和约旦标度因子相关的共形因子在最后的哈勃时间内基本上是恒定的。这些定理意味着变色龙对结构的线性增长的影响可以忽略不计，并且除了作为某种形式的暗能量之外，不能解释观测到的宇宙加速。第二个结果与变色龙理论的量子稳定性有关。我们展示了如何要求量子修正很小，以便能够可靠地预测第五力，导致引力强度耦合的上限m < 0.0073（ρ/ 10 g cm^{-3}）^{1/3} eV，而第五力实验的下限m>0.0042 eV。在第五力实验的范围内，如果改进不到2倍，就可以检验所有经典的变色龙场论，这些场论的量子修正得到了很好的控制，并且与具有接近引力强度的物质耦合，而不管变色龙势的具体形式如何。

英文摘要：

Chameleons are light scalar fields with remarkable properties. Through the interplay of self-interactions and coupling to matter, chameleon particles have a mass that depends on the ambient matter density. The manifestation of the fifth force mediated by chameleons therefore depends sensitively on their environment, which makes for a rich phenomenology. In this article, we review two recent results on chameleon phenomenology. The first result a pair of no-go theorems limiting the cosmological impact of chameleons and their generalizations: i) the range of the chameleon force at cosmological density today can be at most ~Mpc; ii) the conformal factor relating Einstein- and Jordan-frame scale factors is essentially constant over the last Hubble time. These theorems imply that chameleons have negligible effect on the linear growth of structure, and cannot account for the observed cosmic acceleration except as some form of dark energy. The second result pertains to the quantum stability of chameleon theories. We show how requiring that quantum corrections be small, so as to allow reliable predictions of fifth forces, leads to an upper bound of m < 0.0073 (ρ/ 10 g cm^{-3})^{1/3} eV for gravitational strength coupling, whereas fifth force experiments place a lower bound of m>0.0042 eV. An improvement of less than a factor of two in the range of fifth force experiments could test all classical chameleon field theories whose quantum corrections are well-controlled and couple to matter with nearly gravitational strength regardless of the specific form of the chameleon potential.

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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