Ghosts in the Wall
arXiv:2010.14028 · doi:10.1103/PhysRevD.102.115039
Abstract
We consider the possibility of an axion-like particle (ALP) that is a ghost, with wrong-sign kinetic and mass terms. Such an ALP can arise as the partner to an ordinary particle in theories with higher-derivative quadratic terms. We compute the photon regeneration probability in light-shining-through-wall experiments and show that the presence of such a ghostly ALP can lead, in principle, to discernible effects.
arXiv comment13 pages LaTeX, 2 pdf figures
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