An Expression of the Ground State Energy
โ
Masao Hirokawa
๐
Article
๐
1999
๐
Elsevier Science
๐
English
โ 270 KB
An expression of the ground state energy E SB of the spin-boson Hamiltonian H SB is considered. The expression in the cases of both massive and massless bosons is given by a nonperturbative method. By using the expression, we show a necessary and sufficient condition with respect to a parameter G #