物质框架：来自慢力载体的硬反冲
A Material Frame: Hard Recoils from Slow Force Carriers
浏览论文内容
中文总结 AI 辅助
本文修改标准模型使光子纵向分量以远小于光速的速度传播，破坏洛伦兹对称性，给出暗物质探测器约束下的$c_L$上限，提出该参考系为可吸收带电粒子动量的物质介质。
中文摘要 AI 辅助
我们修改了标准模型，使光子的纵向分量成为物理上的自由度，其传播速度满足$c_L \\ ll 1$。这种修改破坏了规范不变性和洛伦兹对称性，定义了一个优先参考系。该理论未引入新的场或尺度，且光子质量由伽利略高形式对称性保护，具有平滑的$c_L \\ to 0$极限：新模式与标准物质解耦，普通规范理论的预测得以恢复。实验约束极为严格：带电粒子会对这些慢模式产生切伦科夫辐射，从而受到来自优先参考系的硬反冲。反冲速率随$c_L$减小，但动量转移仍保持在粒子动量的量级。对keV尺度核反冲敏感的暗物质探测器，给出了量级约束$c_L \\ lesssim 10^{-60}$，这比速度差约束强了数十个量级。在如此小的数值下，$c_L$更应被理解为反冲速率因子，而非具有物理意义的速度。这些慢模式实际上固定在空间中，使得该参考系成为一种能够吸收带电粒子动量的物质介质。
英文摘要
We modify the Standard Model by making the longitudinal component of the photon physical, propagating with small speed $c_L \ll 1$. This modification breaks gauge invariance and Lorentz symmetry, defining a preferred reference frame. No new fields or scales are introduced, and the photon mass is protected by a Galilean higher-form symmetry. The theory has a smooth $c_L\to0$ limit: the new modes decouple from standard matter and ordinary gauge theory predictions are recovered. Experimental constraints are severe. Charged particles Cherenkov-emit these slow modes, experiencing hard recoils against the preferred frame. The recoil rate decreases with $c_L$, but the momentum transfer remains of the order of the particle's momentum. Dark matter detectors, sensitive to keV-scale nuclear recoils, imply an order-of-magnitude bound $c_L \lesssim 10^{-60}$, tens of orders of magnitude stronger than speed-difference bounds. At such values, $c_L$ is better understood as a recoil-rate factor rather than a physically relevant speed. The slow modes, practically fixed in space, make the reference frame a material medium capable of absorbing momentum from charged particles.
