Quantum gravity effects are traditionally tied to short distances and high energies. In this essay, we argue that, perhaps surprisingly, quantum gravity may have important consequences for the phenomenology of the infrared. We center our discussion around a conception of quantum gravity involving a notion of quantum spacetime that arises in metastring theory. This theory allows for an evolution of a cosmological Universe in which string-dual degrees of freedom decouple as the Universe ages. Importantly, such an implementation of quantum gravity allows for the inclusion of a fundamental length scale without introducing the fundamental breaking of Lorentz symmetry. The mechanism seems to have potential for an entirely novel source for dark matter/energy. The simplest observational consequences of this scenario may very well be residual infrared modifications that emerge through the evolution of the Universe.

中文翻译：

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红外中的量子引力现象学

量子引力效应传统上与短距离和高能量有关。在这篇文章中，我们认为，也许令人惊讶的是，量子引力可能对红外现象学产生重要影响。我们将讨论集中在量子引力的概念上，该概念涉及超弦理论中出现的量子时空概念。该理论允许宇宙学宇宙的演化，其中弦双自由度随着宇宙年龄的增长而解耦。重要的是，这种量子引力的实现允许包含基本长度尺度，而不会引入洛伦兹对称性的基本破坏。该机制似乎有可能成为一种全新的暗物质/能量来源。