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Apparent Fine Tunings for Field Theories with Broken Space-Time Symmetries

by Alberto Nicolis, Ira Z. Rothstein

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Submission summary

Authors (as registered SciPost users): Ira Rothstein
Submission information
Preprint Link: scipost_202401_00007v1  (pdf)
Date accepted: 2024-01-31
Date submitted: 2024-01-09 18:43
Submitted by: Rothstein, Ira
Submitted to: SciPost Physics
Ontological classification
Academic field: Physics
  • High-Energy Physics - Theory
Approach: Theoretical


We exhibit a class of effective field theories that have hierarchically small Wilson coefficients for operators that are not protected by symmetries but are not finely tuned. These theories possess bounded target spaces and vacua that break space-time symmetries. We give a physical interpretation of these theories as generalized solids with open boundary conditions. We show that these theories realize unusual RG flows where higher dimensional (seemingly irrelevant) operators become relevant even at weak coupling. Finally, we present an example of a field theory whose vacuum energy relaxes to a hierarchically small value compared to the UV cut-off.

Published as SciPost Phys. 16, 045 (2024)

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