On the $L_p$ Brunn--Minkowski inequality for planar dual quermassintegrals

We determine the sharp $L_p$ Brunn–Minkowski range for planar dual quermassintegrals on origin-symmetric convex bodies: $0<q\le 2$ for $0\le p<1$, and $0<q\le 4$ for $p=1$. The main new results are the Minkowski inequality for $2<q<4$, proved using a weighted spectral inequality on the projective circle, and parallelogram counterexamples for $0<p<1$ and $q>2$. Together with the known logarithmic and endpoint results, we obtain the complete equality classification: only positive dilates occur, except at $(p,q)=(0,2)$, where parallelograms with corresponding sides parallel also give equality.