洛伦兹破坏引起的增强的CMBR非高斯性
Enhanced CMBR non-Gaussianities from Lorentz violation
摘要：
我们研究了洛伦兹对称性破坏对标量CMBR双谱的影响。我们的定量结果表明，在早期宇宙中，当对称性破缺导致的修正色散关系在短时间内违反绝热条件时，动量空间中特定构型的双谱可以增强。被增强的组态的种类和一般出现在双谱中的波数振荡模式严格取决于修正色散关系的形式，因此也取决于洛伦兹破坏的模式。这些效果被发现是不同的，当非常高的能量（transplanckian）物理建模时，通过修改边界条件（修改真空）。事实上，在某些条件下，增强甚至更强，并可能通过这些现象打开一扇实验研究洛伦兹破坏的大门。
英文摘要：
We study the effects of Lorentz symmetry violation on the scalar CMBR bispectrum. Our quantitative results show that there can be enhancements in the bispectrum for specific configurations in momentum space, when the modified dispersion relations resulting from the symmetry breaking violate the adiabatic condition for a short period of time in the early Universe. The kind of configurations that are enhanced and the pattern of oscillations in wavenumbers that generically appear in the bispectrum strictly depend on the form of the modified dispersion relation, and therefore on the pattern of Lorentz violation. These effects are found to be distinct from those that appear when modelling very high-energy (transplanckian) physics via modified boundary conditions (modified vacuum). In fact, under certain conditions, the enhancements are even stronger, and possibly open a door to the experimental study of Lorentz violation through these phenomena.
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