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arXiv 2107.01044astro-ph.COgr-qchep-phhep-th
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关于暗能量的快子稳定性先验

On tachyonic stability priors for dark energy

Rafaela Gsponer, Johannes Noller

摘要:

对于暗能量理论,存在许多稳定性标准,这些标准要求没有鬼、梯度和快子不稳定性。快子不稳定性是最不好的探讨这些在暗能量的背景下,我们在这里讨论和推导出标准的存在和大小的细节。我们的研究结果表明,虽然鬼和梯度不稳定性的情况下,确实是必不可少的物理上可行的模型,因此先验与不存在这种不稳定性显着提高效率的参数估计,而不引入非物理的偏见,这是不是快子不稳定性的情况下。即使是如此强烈的不稳定性也可以存在,而不会破坏基础模型的宇宙学有效性。因此,我们警告使用排除先验的基础上,需要在推导宇宙学参数约束的情况下(强)快子不稳定性。我们说明了这一点,明确计算的上下文中的Horndeski理论的约束,同时量化的大小和相关的快子不稳定性的影响。

英文摘要:

A number of stability criteria exist for dark energy theories, associated with requiring the absence of ghost, gradient and tachyonic instabilities. Tachyonic instabilities are the least well explored of these in the dark energy context and we here discuss and derive criteria for their presence and size in detail. Our findings suggest that, while the absence of ghost and gradient instabilities is indeed essential for physically viable models and so priors associated with the absence of such instabilities significantly increase the efficiency of parameter estimations without introducing unphysical biases, this is not the case for tachyonic instabilities. Even strong such instabilities can be present without spoiling the cosmological validity of the underlying models. Therefore, we caution against using exclusion priors based on requiring the absence of (strong) tachyonic instabilities in deriving cosmological parameter constraints. We illustrate this by explicitly computing such constraints within the context of Horndeski theories, while quantifying the size and effect of related tachyonic instabilities.

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