Nonexistence of a ground state and breaking of the no-ghost theorem on a squeezed string

Yoshihiko Saito

Department of Physics, Osaka City University, Sumiyoshi-ku, Osaka 558, Japan

Received 11 June 1987

For the squeezed string (closed and open) based on the oscillator formalism, we show (i) that all real numbers are allowed for eigenvalues of the Hamiltonian and (ii) neither the Virasoro conditions nor the physical condition in the Becchi-Rouet-Stora formalism eliminate negative-norm states.