Quantum theory of a test field on a quantum cosmological spacetime may be viewed as a theory of the test field on an emergent classical background. In such a case, the resulting dressed metric for the field propagation is a function of the quantum fluctuations of the original geometry. When the backreaction is negligible, massive modes can experience an anisotropic Bianchi type I background. The field modes propagating on such a quantum-gravity-induced spacetime can then unveil interesting phenomenological consequences of the super-Planckian scales, such as gravitational particle production. The aim of this paper is to address the issue of gravitational particle production associated with the massive modes in such an anisotropic dressed spacetime. By imposing a suitable adiabatic condition on the vacuum state and computing the energy density of the created particles, the significance of the particle production on the dynamics of the universe in Planck era is discussed.

中文翻译：

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量子引力中的宇宙粒子产生

量子宇宙学时空上的测试场的量子理论可以看作是在涌现的经典背景下的测试场理论。在这种情况下，场传播的最终修整度量是原始几何的量子涨落的函数。当反向反应可以忽略不计时，大量模式可以体验各向异性的 Bianchi I 型背景。在这种量子引力诱导的时空中传播的场模式可以揭示超普朗克尺度的有趣现象学后果，例如引力粒子的产生。本文的目的是解决与这种各向异性修饰时空中的质量模式相关的引力粒子产生问题。