The quantum N-body problem with a minimal length

TL;DR

This paper investigates the quantum N-body problem within a deformed Heisenberg algebra introducing a minimal length, deriving formulas to estimate ground-state energies and exploring how minimal length effects become more pronounced with increasing particle number.

Contribution

It provides analytical estimates for N-body ground-state energies in a minimal length quantum framework, highlighting the enhanced effects in many-particle systems.

Findings

Ground-state energy estimates for N-body systems with minimal length

Minimal length effects grow faster with N in harmonic oscillator cases

Potential for observing nontrivial minimal length manifestations in multi-particle bound states

Abstract

The quantum $N$-body problem is studied in the context of nonrelativistic quantum mechanics with a one-dimensional deformed Heisenberg algebra of the form $[\hat x,\hat p]=i(1+\beta \hat p^2)$, leading to the existence of a minimal observable length $\sqrt\beta$. For a generic pairwise interaction potential, analytical formulas are obtained that allow to estimate the ground-state energy of the $N$-body system by finding the ground-state energy of a corresponding two-body problem. It is first shown that, in the harmonic oscillator case, the $\beta$-dependent term grows faster with $N$ than the $\beta$-independent one. Then, it is argued that such a behavior should be observed also with generic potentials and for $D$-dimensional systems. In consequence, quantum $N$-body bound states might be interesting places to look at nontrivial manifestations of a minimal length since, the more particles are present, the more the system deviates from standard quantum mechanical predictions.