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arXiv 2402.19459gr-qcastro-ph.GAhep-th
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随机时空对银河旋转曲线的反常贡献

Anomalous contribution to galactic rotation curves due to stochastic spacetime

Jonathan Oppenheim, Andrea Russo

AI总结:

本研究提出随机时空导致低加速度下广义相对论修正,产生熵力,表现为宇宙学常数及反相关的银河旋转曲线拟合贡献,需数值模拟进一步验证。

摘要:

我们考虑一种量子引力的替代方案,其中时空度规被当作经典对象处理,即使物质场仍保持量子性质。该理论的一致性必然要求度规随机演化。在此,我们表明这种随机行为导致广义相对论在低加速度下发生修正。在低加速度区域,引力场产生的加速度方差相对于牛顿势产生的加速度方差较高,并且可以作为熵力,导致偏离爱因斯坦的广义相对论。我们表明,在这种“扩散区域”中,熵力从引力角度来看,表现得如同对物质分布的贡献。我们通过路径积分形式计算度规期望值的修正,并发现一个反常贡献,对应于一个宇宙学常数,与一个用于无暗物质拟合银河旋转曲线的贡献反相关。我们提醒,在得出结论之前需要更深入地理解这种效应,最有可能通过数值模拟来实现,并提供一个计算广义相对论偏差的模板,该偏差可作为时空布朗运动的实验特征。

英文摘要:

We consider a proposed alternative to quantum gravity, in which the spacetime metric is treated as classical, even while matter fields remain quantum. Consistency of the theory necessarily requires that the metric evolve stochastically. Here, we show that this stochastic behaviour leads to a modification of general relativity at low accelerations. In the low acceleration regime, the variance in the acceleration produced by the gravitational field is high in comparison to that produced by the Newtonian potential, and can act as an entropic force, causing a deviation from Einstein's theory of general relativity. We show that in this "diffusion regime", the entropic force acts from a gravitational point of view, as if it were a contribution to the matter distribution. We compute modifications to the expectation value of the metric via the path integral formalism, and find an anomalous contribution which corresponds to a cosmological constant, anti-correlated with a contribution which has been used to fit galactic rotation curves without dark matter. We caution that a greater understanding of this effect is needed before conclusions can be drawn, most likely through numerical simulations, and provide a template for computing the deviation from general relativity which serves as an experimental signature of the Brownian motion of spacetime.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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