标题： 非定域暗物质：量子引力的宇宙遗物 显示英文标题

标题： Off-shell Dark Matter: A Cosmological relic of Quantum Gravity

摘要： 我们研究了宇宙学冷暗物质（CDM）起源的一个新提议，该提议根植于时空的量子性质。 在这个模型中，由于时空非局域性（量子引力的一般理论中预期的现象），量子场的非定域模态可以在渐近态中存在，并扮演冷暗物质的角色，我们将其称为非定域暗物质（OfDM）。 然而，它们的产生速率被非局域性的尺度（例如普朗克长度）抑制。 因此，我们表明OfDM仅在大爆炸的最初时刻产生，并随后有效地脱离相互作用（除了通过其引力相互作用外）。 我们检验了这个模型的观测预测：在宇宙膨胀的背景下，我们证明了这一提议将重新加热温度与暴胀子质量联系起来，这缩小了特定暴胀情景下指数膨胀次数的不确定性。 我们还证明了OfDM确实是冷的，并讨论了可能在小尺度物质功率谱上观察到的特征。 显示英文摘要

摘要： We study a novel proposal for the origin of cosmological cold dark matter (CDM) which is rooted in the quantum nature of spacetime. In this model, off-shell modes of quantum fields can exist in asymptotic states as a result of spacetime nonlocality (expected in generic theories of quantum gravity), and play the role of CDM, which we dub off-shell dark matter (OfDM). However, their rate of production is suppressed by the scale of non-locality (e.g. Planck length). As a result, we show that OfDM is only produced in the first moments of big bang, and then effectively decouples (except through its gravitational interactions). We examine the observational predictions of this model: In the context of cosmic inflation, we show that this proposal relates the reheating temperature to the inflaton mass, which narrows down the uncertainty in the number of e-foldings of specific inflationary scenarios. We also demonstrate that OfDM is indeed cold, and discuss potentially observable signatures on small scale matter power spectrum.