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arXiv 2507.02410gr-qchep-phhep-th
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引力生产不确定性的估计

Estimation of gravitational production uncertainties

Universidad Complutense de Madrid(马德里康普顿斯大学);Instituto de Física Teórica UAM/CSIC(UAM/CSIC理论物理研究所);University of the Basque Country UPV/EHU(巴斯克地区大学)

Jose A. R. Cembranos, Luis J. Garay, Álvaro Parra-López, Javier Ortega del Río

AI总结:

该研究通过分析不同暴胀模型,发现暗物质产生机制在特定条件下具有鲁棒性,其丰度主要由几何耦合决定。

摘要:

宇宙学中标量非最小耦合暗物质的产生依赖于所考虑的暴胀模型的具体细节。我们分析了Starobinsky暴胀和二次势两种情况,求解了完整的背景动力学,研究了暴胀和再加热期间的粒子对产生,并发现观测到的暗物质丰度可以仅由这种机制解释,无论所考虑的暴胀模型如何。两种情况之间仅在暗物质质量接近暴胀尺度时出现定性差异。此外,我们识别出参数空间中一个较大的区域,在该区域中宇宙学产生暗物质主要独立于所选的暴胀势能,突显了这种暗物质产生机制的鲁棒性和对未知暴胀细节的独立性。在质量低于暴胀尺度且远离共形极限的情况下,所产生的粒子的总共动数密度仅取决于其对几何的耦合程度。这使得我们能够提供一个近似的解析表达式来拟合由此产生的丰度。

英文摘要:

Cosmological production of scalar, non-minimally coupled dark matter depends on the specifics of the inflationary model under consideration. We analyze both Starobinsky inflation and a quadratic potential, solve the full background dynamics, study pair production during inflation and reheating, and find that the observed dark matter abundance can be explained solely by this mechanism, regardless of the inflationary model. Qualitative differences between the two cases only appear for dark matter masses close to the inflationary scale. In addition, we identify a large region in parameter space in which cosmological production of dark matter is mostly independent of the chosen inflationary potential, highlighting the robustness of this dark matter production mechanism and its independence of the unknown particular details of inflation. In the region of masses lower than the scale of inflation, and sufficiently away from the conformal limit, the total comoving number density of produced particles becomes a function of the coupling to the geometry alone. This allows us to provide an approximated analytic expression for fitting the resulting abundance.

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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