ダウンロード数: 210
このアイテムのファイル:
ファイル | 記述 | サイズ | フォーマット | |
---|---|---|---|---|
JHEP03(2016)039.pdf | 364.89 kB | Adobe PDF | 見る/開く |
タイトル: | Acausality in nonlocal gravity theory |
著者: | Zhang, Ying li Koyama, Kazuya Sasaki, Misao Zhao, Gong Bo |
著者名の別形: | 佐々木, 節 |
キーワード: | Classical Theories of Gravity Models of Quantum Gravity |
発行日: | Mar-2016 |
出版者: | Springer Berlin Heidelberg |
誌名: | Journal of High Energy Physics |
巻: | 2016 |
論文番号: | 039 |
抄録: | We investigate the nonlocal gravity theory by deriving nonlocal equations of motion using the traditional variation principle in a homogeneous background. We focus on a class of models with a linear nonlocal modification term in the action. It is found that the resulting equations of motion contain the advanced Green’s function, implying that there is an acausality problem. As a consequence, a divergence arises in the solutions due to contributions from the future infinity unless the Universe will go back to the radiation dominated era or become the Minkowski spacetime in the future. We also discuss the relation between the original nonlocal equations and its biscalar-tensor representation and identify the auxiliary fields with the corresponding original nonlocal terms. Finally, we show that the acusality problem cannot be avoided by any function of nonlocal terms in the action. |
著作権等: | © 2016, The Author(s). This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. JHEP is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0 |
URI: | http://hdl.handle.net/2433/210366 |
DOI(出版社版): | 10.1007/JHEP03(2016)039 |
出現コレクション: | 学術雑誌掲載論文等 |
このリポジトリに保管されているアイテムはすべて著作権により保護されています。