PT invariance and gravitational radiation: a remark
- 11 Downloads
In the presence of foam-like topology, topological charges (such as magnetic mass) can develop. In this set-up, the Pauli-Lubanski spin vector is shown to be proportional to the total 4-momentum, provided gravitational radiation (vanishing of the News function) is absent. This can be viewed as an expression of thePT invariance principle. If classicalPT invariance is to prevent radiation in similar set-ups, we suggest to explore the arrow of time (which is expected from the retardation of radiation) at the quantum level where a violation of thePT invariance is likely to appear.