Emergent Majorana mass and axion couplings in superfluids
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Axions (in the general sense) may acquire qualitatively new couplings inside superfluids. Their conventional couplings to fermions, in empty space, involve purely imaginary masses; the new couplings involve emergent Majorana masses. A generalized concept of Majorana mass is proposed, which allows continuous interpolation between Majorana and Dirac fermions, and also extension to bosons. The possibility of weak links for axions, recently put forward, is analyzed and replaced with a non-local analogue.
DepartmentMassachusetts Institute of Technology. Center for Theoretical Physics; Massachusetts Institute of Technology. Department of Physics
New Journal of Physics
Wilczek, Frank. “Emergent Majorana Mass and Axion Couplings in Superfluids.” New Journal of Physics 16, no. 8 (August 1, 2014): 082003. © 2014 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft
Final published version