2023 Articles
Soft theorems for boosts and other time symmetries
We derive soft theorems for theories in which time symmetries — symmetries that involve the transformation of time, an example of which are Lorentz boosts — are spontaneously broken. The soft theorems involve unequal-time correlation functions with the insertion of a soft Goldstone in the far past. Explicit checks are provided for several examples, including the effective theory of a relativistic superfluid and the effective field theory of inflation. We discuss how in certain cases these unequal-time identities capture information at the level of observables that cannot be seen purely in terms of equal-time correlators of the field alone. We also discuss when it is possible to phrase these soft theorems as identities involving equal-time correlators.
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Also Published In
- Title
- Journal of High Energy Physics
- DOI
- https://doi.org/10.1007/JHEP02(2023)123
More About This Work
- Published Here
- July 22, 2024
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- Soft theorems for boosts and other time symmetries
Notes
Classical Theories of Gravity, Effective Field Theories, Space-Time Symmetries, Spontaneous Symmetry Breaking