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arXiv 2105.03751gr-qchep-th
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来自量子引力的类椭球暗能量

Phantom-like dark energy from quantum gravity

Daniele Oriti, Xiankai Pang

摘要:

我们在张量群场论形式下分析了对应于量子引力凝聚的平均场流体动力学的涌现宇宙动力学。我们特别关注的宇宙学效应的基本相互作用,并从不同的量子几何模式的贡献。这种相互作用的一般结果是产生宇宙的加速膨胀,这可能发生在早期,在模型预测的量子反弹之后,也可能发生在晚期。我们的主要结果是,虽然这不能在早期宇宙中给出一个令人信服的暴胀场景,但它在晚期自然产生了一种幽灵般的暗能量动力学,与宇宙学观测相符。通过用一个有效的状态方程来重铸涌现宇宙动力学,我们证明了它可以一般地跨越幻影鸿沟,纯粹出于量子引力效应,而不需要任何额外的幻影物质。此外,我们表明,动力学避免任何大撕裂奇点,而不是接近德西特宇宙渐近。

英文摘要:

We analyse the emergent cosmological dynamics corresponding to the mean field hydrodynamics of quantum gravity condensates, in the tensorial group field theory formalism. We focus in particular on the cosmological effects of fundamental interactions, and on the contributions from different quantum geometric modes. The general consequence of such interactions is to produce an accelerated expansion of the universe, which can happen both at early times, after the quantum bounce predicted by the model, and at late times. Our main result is that, while this fails to give a compelling inflationary scenario in the early universe, it produces naturally a phantom-like dark energy dynamics at late times, compatible with cosmological observations. By recasting the emergent cosmological dynamics in terms of an effective equation of state, we show that it can generically cross the phantom divide, purely out of quantum gravity effects without the need of any additional phantom matter. Furthermore, we show that the dynamics avoids any Big Rip singularity, approaching instead a de Sitter universe asymptotically.

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