Superluminal propagation on a moving braneworld
Superluminal propagation on a moving braneworld
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移动膜世界上的超光速传播
DOI:
10.1103/physrevd.106.085001
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发表时间:
2022
影响因子:
5
通讯作者:
Menon, Arjun S.
中科院分区:
文献类型:
--
作者:
Greene, Brian;Kabat, Daniel;Levin, Janna;Menon, Arjun S.
We consider a braneworld scenario in the simplest setting,, with a four-dimensional (4D) Minkowski metric induced on the brane, and establish the possibility of superluminal propagation. If the brane is at rest, the 4D Lorentz symmetry of the brane is exact, but if the brane is in motion, it is broken globally by the compactification. By measuring bulk fields, an observer on the brane sees a slice through a higher-dimensional field profile, which carries an imprint of the extra dimensions even when the brane is at rest. If the brane is in motion, we find that bulk fields can propagate outside the brane light cone by a parametrically large amount set by the brane velocity. We mention observational tests and possible applications to cosmology.
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