This work constructs perturbation theory for TDiff scalar fields in cosmology, analyzes pressure perturbations and adiabaticity including multi-field interaction effects, and checks stability via effective sound speed.
Di Valentino, et al., Snowmass2021 - Letter of in- terest cosmology intertwined II: The hubble constant tension, Astropart
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Cosmological perturbations of TDiff fields
This work constructs perturbation theory for TDiff scalar fields in cosmology, analyzes pressure perturbations and adiabaticity including multi-field interaction effects, and checks stability via effective sound speed.