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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Dark radiation ： ウィキペディア英語版 Dark radiation Dark radiation is a postulated species of radiation that mediates interactions in the dark sector. That is, just the way photons mediate electromagnetic interactions between particles in the Standard Model (baryonic matter in cosmology), dark radiation is supposed to mediate interactions between dark matter particles.〔 〕 And, similar to dark matter particles, dark radiation doesn't interact with Standard Model particles. Though there has been no notable evidence for the existence of such a species, since the baryonic sector contains multiple interacting species, it is reasonable that the dark sector also does. Moreover, it has been pointed out recently that the cosmic microwave background data seem to suggest that the number of effective neutrino degrees of freedom is more than 3.046, which is the standard case for 3 species of neutrinos.〔(【引用サイトリンク】url=http://arxiv.org/PS_cache/arxiv/pdf/1109/1109.2767v1.pdf )〕 This extra degree of freedom could arise from having a non-trivial amount of dark radiation in the universe. One possible candidate for dark radiation is a sterile neutrino. ==See also== *Dark photon 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Dark radiation」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.