A probe-brane construction yields multi-galileon theories on de Sitter space whose so(N)-breaking vacuum has Goldstone modes with vanishing kinetic terms, giving two dS vacua with different propagating degrees of freedom.
Scattering Amplitudes and Soft Theorems in Multi-Flavor Galileon Theories
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abstract
In this paper, we initiate the study of multi-flavor Galileon theories using the methods of scattering amplitudes. We explore this topic from different perspectives and extend the techniques employed so far mainly in the single-flavor case. This includes soft theorems, generalized soft theorems with non-trivial right-hand side, Galileon dualities, soft bootstrap and bonus relations. We demonstrate new properties on two examples, the multi-flavor U(N) Galileon and the three-flavor U(2)/U(1) Galileon.
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Multi-Galileons in Curved Space
A probe-brane construction yields multi-galileon theories on de Sitter space whose so(N)-breaking vacuum has Goldstone modes with vanishing kinetic terms, giving two dS vacua with different propagating degrees of freedom.