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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 Two-photon physics ： ウィキペディア英語版 Two-photon physics Two-photon physics, also called gamma–gamma physics, is a branch of particle physics that describes the interactions between two photons. If the energy density of the system of the two photons is large enough, matter can be created. ==Astronomy== Photon–photon scattering limits the spectrum of observed gammas to below 80 TeV. The other photon is one of the many photons of the cosmic microwave background. In the frame of reference where the invariant mass of the two photons is at rest, both photons are gammas with just enough energy to pair-produce an electron–positron pair. 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「Two-photon physics」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.