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I was reading some papers in the ABJM theory. I keep reading the term mass deformation but am not sure what it really means. I think the papers assume the reader is familiar with the term. Example paper: http://inspirehep.net/record/1300553?ln=en What is mass deformation?

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In general it is simply an addition (i.e. a deformation) of a mass term to the (super)potential.

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