Stability Under Space Translations. Positive Energy
Franco Strocchi · Theoretical and mathematical physics · 2021
In this chapter we discuss the requirements III and IV stated in Chap. 5 . In the sequel we shall denote by $$\mathcal {H}_{\varphi _0}$$ the Hilbert space sector (HSS) defined by a $$\varphi _{0}\in L^{\infty }(\mathbb {R}^{s})$$ satisfying ( 5.3 ), taking always for granted that $$\psi _{0}\in L^{2}(\mathbb {R}^{s})$$ .