Quantum gravity signatures in the late Universe
Quantum gravity signatures in the late Universe
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DOI：
10.1103/physrevd.108.083507
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发表时间：
2023-01
影响因子：
5
通讯作者：
M. Toomey;S. Koushiappas;B. Alexandre;J. Magueijo
中科院分区：
文献类型：
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作者：
M. Toomey;S. Koushiappas;B. Alexandre;J. Magueijo
在一类基于连接的量子引力模型中，我们计算了宇宙学可观测值的偏差作为参数的函数。在这一理论中，背景宇宙学的巨大修改可能是由于宇宙波函数在从物质到暗能量支配的转变(这在连接空间中起到“反射”作用)的扭曲而发生的。我们能够排除参数空间的一些区域，并用投影的约束表明未来的实验，如DESI，将能够进一步约束这些模型。这个理论的一个有趣的特点是，存在一个参数空间区域，它可以自然地缓解$S_8$的紧张。
We calculate deviations in cosmological observables as a function of parameters in a class of connection-based models of quantum gravity. In this theory non-trivial modifications to the background cosmology can occur due to a distortion of the wave function of the Universe at the transition from matter to dark energy domination (which acts as a"reflection"in connection space). We are able to exclude some regions of parameter space and show with projected constraints that future experiments like DESI will be able to further constrain these models. An interesting feature of this theory is that there exists a region of parameter space that could naturally alleviate the $S_8$ tension.