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arXiv 2605.20102hep-phgr-qchep-th
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非相对论宇宙学碰撞体信号

Non-relativistic Cosmological Collider Signals

Brazilian Center for Research in Physics (CBPF)(巴西物理研究中心);Federal University of Espírito Santo (UFES)(圣埃斯皮里图联邦大学)

Matheus C. Ferreira, Felipe T. Falciano

AI总结:

该研究探讨了在通胀相互作用由质量倾斜虚谱观察者场介导的场景中非相对论碰撞体的实现,通过非相对论修正导致谱变形,产生独特的碰撞体信号,其核心方法是观察者模式的传播效应,主要贡献是揭示了非相对论传播对非高斯性的影响。

摘要:

我们研究了在通胀相互作用由质量倾斜虚谱观察者场介导的场景中非相对论碰撞体的实现。与标准无boost碰撞体构造不同,其中非高斯特征主要由break boosting相互作用顶点生成,而在当前框架中,主导效应直接来自观察者模式的传播。非相对论修正变形了bulk模式函数,诱导出倾斜,修改in-in相关子并产生独特的碰撞体信号。所产生的挤压极限非高斯性重现了无boost宇宙学碰撞体信号的定性结构,但源于根本不同的动力学机制。构造中的核心特征是有效化学势-like参数的出现,该参数控制了两个晚期振荡分支的相对权重。然而,倾斜虚模式表现出独特的动力学特征,不对应于常规的化学势变形。根据倾斜的符号,相应的非高斯信号可以被增强或抑制。我们展示了倾斜虚场景提供了一个简单的有效框架,在其中无boost碰撞体现象学和化学势-like分支不对称性自然地从非相对论传播效应中产生。

英文摘要:

We investigate a non-relativistic realization of the boostless cosmological collider in a scenario where inflationary interactions are mediated by a massive tilted-ghost spectator field. Unlike standard boostless collider constructions, in which the characteristic non-Gaussian signatures are mainly generated by boost-breaking interaction vertices, the dominant effect in the present framework arises directly from the propagation of the spectator modes. Non-relativistic corrections deform the bulk mode functions, inducing a tilt that modifies the in-in correlators and generates a distinctive collider signal. The resulting squeezed-limit non-Gaussianity reproduces the qualitative structure of boostless cosmological-collider signals while originating from a fundamentally different dynamical mechanism. A central feature of the construction is the emergence of an effective chemical-potential-like parameter that controls the relative weight of the two late-time oscillatory branches. However, the tilted-ghost mode exhibits distinctive dynamical features and does not correspond to a conventional chemical-potential deformation. Depending on the sign of the tilt, the corresponding non-Gaussian signal can be either enhanced or suppressed. We show that the tilted-ghost scenario provides a simple effective framework in which boostless-collider phenomenology and chemical-potential-like branch asymmetries arise naturally from non-relativistic propagation effects.

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