发表机构
University of Nottingham; Scuola Normale Superiore; INFN, Sezione di Pisa; Institute for Advanced Study and Department of Physics, Hong Kong University of Science and Technology; Department of Applied Mathematics and Theoretical Physics University of Cambridge（诺丁汉大学; 比萨高等师范学院; 意大利国家核物理研究所比萨分部; 香港科技大学高等研究院及物理系; 剑桥大学应用数学与理论物理系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究构建满足微观因果性等条件的Boostless Proca理论，将其与暴胀子耦合，发现双谱无新信号，三谱及更高阶点函数可产生含5个参数的新形状，为新物理提供模型无关探针。
AI 中文摘要
我们构建了在暴胀背景下传播的自旋-1场的一般理论，该理论满足标度不变性、旋转对称性、Bunch-Davies条件和微观因果性。我们的Boostless Proca理论将通常的有质量Proca理论推广为具有5个自由参数的拉格朗日量：4个对应宇称偶项，1个对应宇称奇项。我们从一开始就施加3个自由度，发现微观因果性（即场算符在光锥外为零的表述）要求动能项具有规范不变性。我们将该自旋-1态与暴胀子耦合，研究其在宇宙学关联函数上留下的特征。我们发现双谱没有新信号，这意味着已知信号是最一般的，从而为这种非高斯性的主导形式中的新物理提供了非常清晰的模型无关探针。对于三谱及更高阶点函数，Boostless Proca理论产生了新的形状，原则上所有5个参数均可测量。
英文摘要
We construct the general theory of a spin-1 field propagating on an inflationary background consistent with scale invariance, rotations, Bunch-Davies conditions and microcausality. Our Boostless Proca theory generalises the usual massive Proca theory to a Lagrangian with 5 free parameters: 4 corresponding to parity-even terms and a single parity-odd term. We impose three degrees of freedom from the outset and find that microcausality, the statement that field operators vanish outside the lightcone, requires the kinetic terms to be gauge invariant. We couple this spin-1 state to the inflaton and study the signatures it imprints on cosmological correlators. We find no new signals for the bispectrum meaning that the known signals are the most general thereby providing a very clean model-independent probe of new physics in this leading form of non-Gaussianity. For the trispectrum and higher-point functions, the boostless Proca theory produces new shapes with all 5 parameters in principle measurable.
Comments61 pages, 5 figures
