On massive Nambu-Goldstone fields
Moscow Institute of Physics and Technology, Institutskii per. 9, Dolgoprudny 141700, Moscow Region, Russia,
2 Institute for Nuclear Research of the Russian Academy of Sciences, 60th October Anniversary Prospect, 7a, 117312 Moscow, Russia,
3 Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015, Lausanne, Switzerland
* e-mail: email@example.com
** e-mail: firstname.lastname@example.org 1By Nambu-Goldstone fields we understand the degrees of freedom (DoF) associated with the action of the broken generators on the vacuum.
Published online: 31 October 2018
We consider two theories undergoing the same spontaneous symmetry breaking pattern but with different representations of an order parameter under the Lorentz group. The effective description of the first theory includes a massive Nambu-Goldstone field, while in the second example it is absent. Based on this, we clarify the physical meaning of massive Nambu-Goldstone fields as non-radial modes needed to describe the fluctuations of an order parameter. The connection with the inverse Higgs phenomenon is also discussed.
© The Authors, published by EDP Sciences, 2018
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