Recently,it has been realized that in some systems internal space rotation can induce energy amplification for scattered waves,similar to rotation in real space.In particularly,it has been shown that energy extraction is possible for a Q-ball,a stationary non-topological soliton that is coherently rotating in its field space.In this paper,we generalize the analysis to the case of boson stars,and show that the same energy extraction mechanism still works for boson stars.
School of Physical Sciences,University of Science and Technology of China,Hefei 230026,China
School of Physics and Astronomy,University of Nottingham,University Park,Nottingham NG7 2RD,UK
Interdisciplinary Center for Theoretical Study,University of Science and Technology of China,Hefei 230026,China
Peng Huanwu Center for Fundamental Theory,Hefei 230026,China
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Fundamental Research Funds for the Central UniversitiesNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Key R&D Program of ChinaSTFC ConsolidatedNational Natural Science Foundation of China
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