2016/08/31 by Jan Dereziński · 1 citation
Physics and Astronomy · Mathematics · #math-ph #math.MP
paper · pdf · doi:10.1063/1.5017931
In the 1st version Theorem 3.11 was incorrect. Main changes in the 2nd version is correction of this mistake and a more detailed introduction
arxiv created 2017/01/01 · arxiv updated 2018/01/17
We discuss self-adjoint operators given formally by expressions quadratic in bosonic creation and annihilation operators. We give conditions when they can be defined as self-adjoint operators, possibly after an infinite renormalization. We also discuss explicit formulas for their infimum. Our main motivation comes from Local Quantum Field Theory, which furnishes interesting examples of bosonic quadratic Hamiltonians that require an infinite renormalization.