标题： 来自河外天体VHE谱的EBL衰减的宇宙学参数约束 显示英文标题

标题： Constraints on cosmological parameters from the EBL attenuation of VHE spectra of extragalactic sources

摘要： 宇宙外背景光（EBL）通过电子对产生过程导致河外源的超高能谱衰减。 衰减的程度取决于源的距离，即取决于超高能光子沿视线路径的积分。 视线路径的计算取决于宇宙学参数及其演变的值。 随着观测结果最近表明EBL水平较低，以及未来切连科夫实验的更高灵敏度，将有可能探测到更高红移的源。 我们研究河外源的EBL衰减是否足够敏感，以对宇宙学参数施加限制。 显示英文摘要

摘要： The Extragalactic Background Light (EBL) causes attenuation of the VHE spectra of extragalactic sources, via pair-production. The amount of attenuation depends on the distance of the source, i.e. on the integration over the line of sight path taken by the VHE photons. The line of sight path calculation, depends on the values of the cosmological parameters and the evolution of these parameters. With the recent indications of a lower EBL level from observations and the greater sensitivity of the proposed future Cherenkov experiments it will be possible to detect higher redshift sources. We study whether the EBL attenuation of extragalactic sources is sensitive enough to put constrains on the cosmological parameters.