The observed Lorentz invariance of space-time allows only the formation of condensates which are Lorentz scalars and have vanishing charge. Thus fermion condensates must be of the form ⟨ ⟨ ψ ψ ¯ ¯ ψ ψ ⟩ ⟩ , where ψ is the fermion field. Similarly a tensor field, G μν, can only have a scalar expectation value such as ⟨ ⟨ G μ μ ν ν G μ μ ν ν ⟩ ⟩ .