期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 1, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP01(2015)146
关键词
Space-Time Symmetries; Global Symmetries
资金
- NASA [NNX10AH14G]
- DOE [DE-FG02-11ER41743]
- NASA [NNX10AH14G, 133622] Funding Source: Federal RePORTER
The Galilei group involves mass as a central charge. We show that the associated superselection rule is incompatible with the observed phenomenology of superfluid helium 4: this is recovered only under the assumption that mass is spontaneou.519 broken. This remark is somewhat immaterial for the real world, where the correct space-time symmetries are encoded by the Poincare group, which has no central charge. Yet it provides an explicit example of how superselection rules can be experimentally tested. -We elaborate on what conditions must be met for our ideas to be generalizable to the relativistic case of the integer/half-integer angular momentum superselection rule.
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