Very recently, E. H. Lieb and J. P. Solovej stated a conjecture about the constant of embedding between two Bergman spaces of the upper-half plane. A question in relation with a Werhl-type entropy inequality for the affine $AX+B$ group. More precisely, that for any holomorphic function $F$ on the upper-half plane $Pi^+$, $$int_{Pi^+}|F(x+iy)|^{2s}y^{2s-2}dxdyle frac{pi^{1-s}}{(2s-1)2^{2s-2}}left(int_{Pi^+}|F(x+iy)|^2 dxdyright)^s $$ for $sge 1$, and the constant $frac{pi^{1-s}}{(2s-1)2^{2s-2}}$ is sharp. We prove differently that the above holds whenever $s$ is an integer and we prove that it holds when $srightarrowinfty$. We also prove that when restricted to powers of the Bergman kernel, the conjecture holds. We next study the case where $s$ is close to $1.$ Hereafter, we transfer the conjecture to the unit disc where we show that the conjecture holds when restricted to analytic monomials. Finally, we overview the bounds we obtain in our attempts to prove the conjecture.
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