AXIONS: RECENT SEARCHES AND NEW LIMITS ∗
AXIONS: RECENT SEARCHES AND NEW LIMITS ∗
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轴子：最近的搜索和新的限制*
DOI：
10.4230/lipics.itcs.2019.20
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
G. Raffelt
中科院分区：
文献类型：
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作者：
G. Raffelt
欧洲核子研究中心的轴子太阳望远镜(CAST)实验用“日光镜”的方法寻找太阳轴子。第一个结果表明，在这个质量范围内，对于Ma∼0.02 eV，Ga<；1.16×1010GeV1(95%CL)的轴光子耦合存在一个上限，取代了以前球状星系星的能量损失上限。由于变压氦填充了磁过渡区，CAST II将把对轴子质量的灵敏度扩展到大约1 eV，这是第一次在实验室实验中测试真实的轴子参数。在这个质量范围内，轴子将贡献宇宙热暗物质成分。新的结构形成极限意味着1-2 eV。对于具有标准轴子-介子耦合的强子轴子的特殊情况，现在的宇宙轴子密度约为50cm3，宇宙质量极限为mA<；1.05 eV(95%CL)。我们还对在PVLAS实验中观察到的反常信号的轴子解释进行了评论。
The CERN Axion Solar Telescope (CAST) experiment searches for solar axions by the “helioscope” method. First results imply an upper limit on the axionphoton coupling of ga < 1.16 × 10 10 GeV 1 (95% CL) for ma ∼0.02 eV, in this mass range superseding the previous energy-loss limit from globular cluster stars. By virtue of a variable-pressure helium filling of the magnetic transition region, CAST II will extend the sensitivity to axion masses up to about 1 eV, for the first time testing realistic axion parameters in a laboratory experiment. In this mass range axions would contribute a cosmic hot dark matter component. New structure-formation limits imply that ma < 1–2 eV. For the particular case of hadronic axions with a standard axion-pion coupling, the present-day cosmic axion density would be about 50 cm 3 and the cosmic mass limit is ma < 1.05 eV (95% CL). We also comment on the axion interpretation of the anomalous signature observed in the PVLAS experiment.