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arXiv 2102.08401hep-thmath-phmath.MP
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宇宙Yang-Mills场的不稳定性

Instability of cosmic Yang-Mills fields

Kaushlendra Kumar, Olaf Lechtenfeld, Gabriel Picanço Costa

摘要:

在任何共形平坦的四维时空中,存在一个小族SO(4)不变但依赖于时间的SU(2)杨-米尔斯解析解。这可能在早期宇宙学中起到稳定对称希格斯真空的作用。我们通过对角化它们周围的(与时间相关的)杨-米尔斯涨落算符并将Floquet理论应用于其本征频率和简正模,分析了这些“宇宙规范场”在保持度规冻结的同时对抗一般规范场扰动的线性稳定性。除了精确可解的SO(4)单重态微扰,它被发现是边缘稳定的线性,但有界的非线性,一般的正常模式往往是指数增长,由于共振效应。即使在非常高的能量下,所有的宇宙杨米尔斯背景都呈现线性不稳定。

英文摘要:

There exists a small family of analytic SO(4)-invariant but time-dependent SU(2) Yang-Mills solutions in any conformally flat four-dimensional spacetime. These might play a role in early-universe cosmology for stabilizing the symmetric Higgs vacuum. We analyze the linear stability of these "cosmic gauge fields" against general gauge-field perturbations while keeping the metric frozen, by diagonalizing the (time-dependent) Yang-Mills fluctuation operator around them and applying Floquet theory to its eigenfrequencies and normal modes. Except for the exactly solvable SO(4) singlet perturbation, which is found to be marginally stable linearly but bounded nonlinearly, generic normal modes often grow exponentially due to resonance effects. Even at very high energies, all cosmic Yang-Mills backgrounds are rendered linearly unstable.

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