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arXiv 2301.07718hep-phastro-ph.CO
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来自振荡伸缩子的暗光子暗物质

Dark photon dark matter from an oscillating dilaton

Peter Adshead, Kaloian D. Lozanov, Zachary J. Weiner

AI总结:

本文提出通过振荡伸缩子与暗光子动能项耦合在早期宇宙共振产生超轻暗光子暗物质,并证明在暗光子质量为伸缩子一半时,即使小振幅振荡也能高效产生质量低至10^-20 eV的矢量暗物质。

摘要:

我们提出了一种在早期宇宙中通过类伸缩子标量场与暗光子动能项耦合来产生超轻暗光子暗物质的机制。能量最初储存在伸缩子的凝聚体中,当伸缩子在早期宇宙中开始振荡时,它会共振地产生暗光子。虽然类似的轴子-暗光子耦合情形需要较大的耦合系数才能完全产生暗光子,但伸缩子耦合具有一个独特的机制:当暗光子的质量是伸缩子质量的一半时,即使伸缩子进行小振幅振荡,暗光子也会被大量产生。与宇宙微波背景相符的情形允许质量低至 $10^{-20}$ eV 的超轻矢量暗物质。

英文摘要:

We present a mechanism for generating ultralight dark photon dark matter in the early Universe via a dilatonlike scalar field coupled to the dark photon's kinetic term. Energy is initially stored in the condensate of the dilaton, which resonantly produces dark photons when it begins oscillating in the early Universe. While similar scenarios with axion--dark-photon couplings require large coupling coefficients to fully populate the dark photon, the dilatonic coupling features a unique regime: When the dark photon's mass is half that of the dilaton, dark photons are copiously produced even when the dilaton undergoes small-amplitude oscillations. Scenarios consistent with the cosmic microwave background allow for ultralight vector dark matter with mass as light as $10^{-20}$ eV.

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