Conformally invariant trilinear forms on the sphere
Conformally invariant trilinear forms on the sphere
To each complex number λ is associated a representation π λ of the conformal group SO 0 (1,n) on 𝒞 ∞ (S n-1 ) (spherical principal series). For three values λ 1 ,λ 2 ,λ 3 , we construct a trilinear form on 𝒞 ∞ (S n-1 )×𝒞 ∞ (S …