Let $M(1)$ be the vertex operator algebra with the Virasoro element $\omega$ associated to the Heisenberg algebra of rank $1$ and let $M(1)^{ +}$ be the subalgebra of $M(1)$ consisting of the fixed points of an automorphism of $M(1)$ of order $2$. We classify the simple weak $M(1)^{ +}$-modules with a non-zero element $w$ such that for some integer $s\geq 2$, $\omega_i w\in{ \mathbb C}w$ ($i=\lfloor s/2\rfloor+1,\lfloor s/2\rfloor+2,\ldots,s-1$), $\omega_{ s}w\in{ \mathbb C}^{ \times}w$, and $\omega_i w=0$ for all $i>s$. The result says that any such simple weak $M(1)^{ +}$-module is isomorphic to some simple weak $M(1)$-module or to some $\theta$-twisted simple weak $M(1)$-module.
Categories: math.QA