Proofs of Mizuno’s conjectures on generalized rank two Nahm sums

Recently, Mizuno studied generalized Nahm sums associated with symmetrizable matrices. He provided 14 sets of candidates of modular Nahm sums in rank two and justified four of them. We prove the modularity for eight other sets of candidates and present conjectural formulas for the remaining two sets of candidates. This is achieved by finding Rogers–Ramanujan type identities associated with these Nahm sums. We also prove Mizuno’s conjectural modular transformation formula for a vector-valued function consisting of Nahm sums. Meanwhile, we find some new non-modular identities for some other Nahm sums associated with the matrices in Mizuno’s candidates.