Abstract
It was pointed out in a recent paper that the observed cooling rate of old, cold neutron stars (NS) can provide an upper limit on the transition rate of neutron to mirror neutron (). This limit is so stringent that it would preclude any discovery of oscillation in the current round of terrestrial searches for the process. Motivated by this crucially important conclusion, we critically analyze this suggestion and note an interesting new effect present in nearly exact mirror models for oscillation, which significantly affects this bound. The new element is the decay , which creates a cloud of mirror particles , , , and inside the NS core. The can “rob” the energy generated by the transition via scattering enabled by the presence of a (minute) millicharge in mirror particles. This energy is emitted as unobserved mirror photons via fast mirror bremsstrahlung leading to a relaxation of this upper limit.
- Received 23 March 2022
- Accepted 21 July 2022
DOI:https://doi.org/10.1103/PhysRevLett.129.061103
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society