Importance of studying mass deformed field theory

Question

I'm sorry if I will be a little vague in the question but I want to know more things as possible about field theories (in general but in particular supersymmetric or string theories) in which is useful to considered mass deformations. When, where and why is useful or important to study what are the effects of mass deformations in some string theory / supersymmetric gauge theory or ecc.?

I hope you will give me some reference or some example to make me to understand better the reasons why the mass deformations can be relevant.

Sometimes they require from me to be more specific but this time I really want to know anything about this kind of object from any point of view, so I really appreciate any contribution which can help me to make me to do a better idea.

This post imported from StackExchange Physics at 2017-05-24 17:11 (UTC), posted by SE-user Alessandro Mininno

Comments

It's indeed to vague a questions, so you deserve a vague answer :-) In my experience mass deformations are interesting as a way to trigger an RG flow, that is to find a new theory that emerge in the IR following the deformation of the UV theory.

This post imported from StackExchange Physics at 2017-05-24 17:11 (UTC), posted by SE-user TwoBs

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Mass is just a parameter and cannot be deformed. Do you mean mass perturbations?