Small fluctuations around a constant electric or constant magnetic field F are analyzed in a theory with pseudo scalar phi with a coupling gphiFtilde F. It is found that a magnetic external field leads to mass generation for the small perturbations, while an electric field suffers from a tachyonic mass generation in the case in which the field strength is higher than a critical value (related to the pseudo scalar mass). The vacuum energy can be exactly evaluated and it is found that an imaginary part is present when the external electric field exceeds its critical value.

Real and imaginary mass generation in the presence of external fields and axions

SPALLUCCI, EURO
2003-01-01

Abstract

Small fluctuations around a constant electric or constant magnetic field F are analyzed in a theory with pseudo scalar phi with a coupling gphiFtilde F. It is found that a magnetic external field leads to mass generation for the small perturbations, while an electric field suffers from a tachyonic mass generation in the case in which the field strength is higher than a critical value (related to the pseudo scalar mass). The vacuum energy can be exactly evaluated and it is found that an imaginary part is present when the external electric field exceeds its critical value.
2003
http://iopscience.iop.org/1126-6708/2003/09/044
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2500942
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