Spontaneously broken mass

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.


Published in:
Journal Of High Energy Physics, 1
Year:
2015
Publisher:
New York, Springer
ISSN:
1029-8479
Keywords:
Laboratories:




 Record created 2015-05-29, last modified 2018-09-13


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