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UV completion without symmetry restoration
Solomon Endlich, Alberto Nicolis, Riccardo Penco
We show that it is not possible to UV-complete certain low-energy effective theories with spontaneously broken space-time symmetries by embedding them into linear sigma models, tha…
Spontaneously broken mass
Solomon Endlich, Alberto Nicolis, Riccardo Penco
The Galilei group involves mass as a central charge. We show that the associated superselection rule is incompatible with the observed phenomenology of superfluid helium 4: this is…
The squeezed limit of the solid inflation three-point function
Solomon Endlich, Bart Horn, Alberto Nicolis +1
The recently proposed model of 'solid inflation' features a peculiar three-point function for scalar perturbations with an anisotropic, purely quadrupolar, squeezed limit. We confi…
Relativistic Fluids, Superfluids, Solids and Supersolids from a Coset Construction
Alberto Nicolis, Riccardo Penco, Rachel A. Rosen
We provide a systematic coset construction of the effective field theories governing the low-energy dynamics of relativistic fluids and solids, and of their "super" counterparts. T…
More on gapped Goldstones at finite density: More gapped Goldstones
Alberto Nicolis, Riccardo Penco, Federico Piazza +1
It was recently argued that certain relativistic theories at finite density can exhibit an unconventional spectrum of Goldstone excitations, with gapped Goldstones whose gap is exa…
The incompressible fluid revisited: vortex-sound interactions
Solomon Endlich, Alberto Nicolis
We study the dynamics of a nearly incompressible fluid via (classical) effective field theory. In the kinematical regime corresponding to near incompressibility (small fluid veloci…