A note on large clusters of $E_2$-numbers

Source abstract

Let $q_n$ denote the $n$th product of two distinct primes. By completing a square in Sono's sieve and solving the resulting one-dimensional variational problem, we prove unconditionally that, for every $\varepsilon>0$ and all sufficiently large integers $ρ$, $$\liminf_{n\to\infty}(q_{n+ρ}-q_n) \leq \exp\left((π+\varepsilon)\sqrtρ\right).$$