Optimizers for the finite-rank fractional Lieb--Thirring inequality

Abstract: The finite-rank fractional Lieb--Thirring inequality provides an estimate on the Riesz sum of the first $N$ negative eigenvalues of the fractional Schrödinger operator $(-Δ)<sup>s-V$ in terms of the $L^{{γ+\frac{d}{2s}}(\mathbb} R<sup>d)$ norm of the potential $V$, where the Riesz exponent $γ&gt;\max\left{0,1-d/(2s)\right}$. We prove the existence of optimizers for every finite rank by establishing a result on the spectrum in the case of dichotomy. We further characterize the spectral gap and qualitative properties of optimizers, including the Euler--Lagrange equation, regularity, and asymptotic behavior at infinity. In particular, under the condition $γ+{d}/{(2s)}\geq 3+{4s}/{d}$, we show that all normalized maximizing sequences are precompact modulo translations. Moreover, we derive a strict binding inequality for the optimal constants in the finite-rank setting, which implies that the optimal fractional Lieb--Thirring constant, if it exists, cannot be attained by a potential with finitely many negative eigenvalues.