Anomalous Bootstrap on the half line

TL;DR

This paper investigates the bootstrap method on the half line, emphasizing the importance of the full set of Stieltjes constraints, and introduces corrections for boundary conditions, demonstrating their effectiveness with the linear potential example.

Contribution

It highlights the necessity of enlarging positive matrices and correcting recursion relations for accurate bootstrap analysis on the half line, especially for boundary conditions.

Findings

Constraints alone do not fix boundary conditions.

Additional anomalous contributions are needed in recursion relations.

Bootstrap results match analytical solutions for the linear potential.

Abstract

We study carefully the problem of the bootstrap on the half line. We show why one needs the full set of constraints derived from the Stieltjes theorem on the moment problem by reexamining previous results on the hydrogen atom. We also study the hydrogen atom at continuous angular momentum. We show that the constraints on the moment problem alone do not fix the boundary conditions in all cases and at least one of the positive matrices needs to be slightly enlarged to remove unphysical branches. We explain how to solve the more general problem of the bootstrap for Robin boundary conditions. The recursion relations that are usually used receive additional anomalous contributions. These corrections are necessary to compute the moments of the measure. We apply these to the linear potential and we show how the bootstrap matches the analytical results, based on the Airy function, for this example.