论文标题
运动中的通货膨胀：有效的洛伦兹对称性损坏的有效场理论中的单位性约束
Inflation in Motion: Unitarity Constraints in Effective Field Theories with Broken Lorentz Symmetry
论文作者
论文摘要
在通货膨胀期间，有一个优选的参考框架，其中背景时空的膨胀在空间上是各向同性的。与Minkowski时空相反，可观察物可以取决于系统相对于此宇宙休息框架的速度。我们从辐射稳定性和单位性中得出了新的约束，并具有如此自发损坏的洛伦兹对称性的有效野外理论。除了最大的能量量表外，现在还有一个临界速度，该理论分解了。因此，该理论在时间和空间中具有不同的解决能力，我们表明，只有在没有立方体洛伦兹侵略性相互作用的情况下才能重合。将这些界限应用于有效的通货膨胀理论，我们确定了参数空间的区域，其中通货膨胀既可以是单场又弱耦合到亚场量表。这可以作为理论上的先验实现，我们使用原始双光谱的普朗克观察约束明确说明了这一点。
During inflation, there is a preferred reference frame in which the expansion of the background spacetime is spatially isotropic. In contrast to Minkowski spacetime, observables can depend on the velocity of the system with respect to this cosmic rest frame. We derive new constraints from radiative stability and unitarity on effective field theories with such spontaneously broken Lorentz symmetry. In addition to a maximum energy scale, there is now also a critical velocity at which the theory breaks down. The theory therefore has different resolving power in time and in space, and we show that these can only coincide if cubic Lorentz-violating interactions are absent. Applying these bounds to the Effective Field Theory of Inflation, we identify the region of parameter space in which inflation can be both single-field and weakly coupled on subhorizon scales. This can be implemented as a theoretical prior, and we illustrate this explicitly using Planck observational constraints on the primordial bispectrum.
