Dimming of supernovae by photon-pseudoscalar conversion and the intergalactic plasma
Dimming of supernovae by photon-pseudoscalar conversion and the intergalactic plasma
复制标题
通过光子赝标量转换和星系间等离子体使超新星变暗
DOI：
10.1103/physrevd.66.043517
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发表时间：
2001
影响因子：
5
通讯作者：
M. Zaldarriaga
中科院分区：
文献类型：
--
作者：
C. Deffayet;D. Harari;J. Uzan;M. Zaldarriaga
最近有人提出，观测到的遥远的Ia型超新星变暗可能是光子与非常轻的轴子混合的结果。我们指出，等离子体的影响，其中的光子传播，必须考虑在内。这种效应改变了振荡概率，并使调光频率依赖，与观察相反。人们可能希望通过在许多不同的相干域上平均振荡来容纳数据。我们估计相干损失的影响，无论是由于磁场的不均匀性或星系际等离子体。这些估计表明，消色差问题只能用星系际介质的非常特殊的，可能是不现实的性质来解决。
It has been suggested recently that the observed dimming of distant type Ia supernovae may be a consequence of mixing of the photons with very light axions. We point out that the effect of the plasma, in which the photons are propagating, must be taken into account. This effect changes the oscillation probability and renders the dimming frequency dependent, contrary to observations. One may hope to accommodate the data by averaging the oscillations over many different coherence domains. We estimate the effect of coherence loss, either due to the inhomogeneities of the magnetic field or of the intergalactic plasma. These estimates indicate that the achromaticity problem can be resolved only with very specific, and probably unrealistic, properties of the intergalactic medium.