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arXiv 1402.4776hep-phastro-ph.CO
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轴子暗物质玻色-爱因斯坦凝聚的远离平衡态动力学

Far from equilibrium dynamics of Bose-Einstein condensation for Axion Dark Matter

Juergen Berges, Joerg Jaeckel

摘要:

轴子和类似的相互作用非常弱的粒子越来越成为宇宙中冷暗物质的有力候选者。轴子的质量非常低,在早期宇宙中以非热的方式产生,其特征是占据数非常高。有人认为这会导致玻色-爱因斯坦凝聚体的形成,对观测和直接探测实验有潜在的重大影响。在本文中,我们的目的是澄清,如果玻色-爱因斯坦凝聚发生在光和非常弱的相互作用暗物质粒子,它不会发生在热平衡,但描述了一个远离平衡态。特别是,我们指出,动态的特点是由两个非常不同的时间尺度,使冷凝发生在一个更短的时间尺度比充分热化。

英文摘要:

Axions and similar very weakly interacting particles are increasingly compelling candidates for the cold dark matter of the universe. Having very low mass and being produced non-thermally in the early Universe, axions feature extremely high occupation numbers. It has been suggested that this leads to the formation of a Bose-Einstein condensate with potentially significant impact on observation and direct detection experiments. In this note we aim to clarify that if Bose-Einstein condensation occurs for light and very weakly interacting dark matter particles, it does not happen in thermal equilibrium but is described by a far-from-equilibrium state. In particular we point out that the dynamics is characterized by two very different timescales, such that condensation occurs on a much shorter timescale than full thermalization.

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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