The Bloch-Okounkov correlation functions of negative levels

Bloch and Okounkov introduced an $n$-point correlation function on the fermionic Fock space and found a closed formula in terms of theta functions. This function affords several distinguished interpretations and in particular can be formulated as correlation functions on irreducible ${\widehat{gl}}_{\mathrm{\infty }}$-modules of level one. These correlation functions have been generalized for irreducible integrable modules of ${\widehat{gl}}_{\mathrm{\infty }}$ and its classical Lie subalgebras of positive levels by the authors. In this paper we extend further these results and compute the correlation functions as well as the $q$-dimensions for modules of ${\widehat{gl}}_{\mathrm{\infty }}$ and its classical subalgebras at negative levels.