标题： 显式时空对称性破缺与原初场的动力学 显示英文标题

标题： Explicit spacetime-symmetry breaking and the dynamics of primordial fields

摘要： 我们使用洛伦兹/CPT破坏的有效场论来研究显式时空对称性破缺对原初张量扰动的影响。 我们发现胶子仍然是无质量的，但张量模式的传播速度被修改，并且我们从引力速度的最新测量中得到了一个关于对称性破缺系数的约束，其数量级为$10^{-15}$。 由于对称性破缺，德西特阶段被修改，在这个暴胀时期，谱功率围绕广义相对论极限出现缓慢振荡；此外，我们发现原初张量功率谱保持尺度不变性，但振幅被修改。 我们还发现，在辐射主导期间成为视界内的模式会获得一个与洛伦兹破坏系数成比例的相位变化。 显示英文摘要

摘要： We study the effects of explicit spacetime-symmetry breaking on primordial tensor fluctuations using an effective-field theory for Lorentz/CPT violation. We find that the graviton is still massless, but that the propagation speed of tensor modes is modified, and we obtain a constraint on the coefficient determining the symmetry breaking on the order of $10^{-15}$ from the recent measurements of the speed of gravity. Due to the symmetry breaking, the de-Sitter phase is modified, and during this inflationary epoch, the power spectrum assumes a slow oscillation around the general-relativity limit; further, we find that the primordial tensor power spectrum retains its scale invariance, but that the amplitude is modified. We also find that the modes which become subhorizon during radiation domination acquire a phase shift proportional to the coefficient for Lorentz violation.