Isometry Group Orbit Quantization of Spinning Strings in AdS_3 x S^3

TL;DR

This paper develops a Hamiltonian framework for quantizing spinning strings in AdS_3 x S^3 using isometry group orbits, leading to a novel oscillator-based energy spectrum and insights into short string states.

Contribution

It introduces a Hamiltonian approach to orbit quantization of spinning strings in AdS_3 x S^3, applying Holstein-Primakoff realization to analyze their spectra.

Findings

Derived a one-parameter family of particle orbits with oscillator spectra.

Extended the method to spinning strings with specific winding numbers.

Verified the spectrum of short strings at strong coupling.

Abstract

Describing the bosonic AdS_3 x S^3 particle and string in SU(1,1) x SU(2) group variables, we provide a Hamiltonian treatment of the isometry group orbits of solutions via analysis of the pre-symplectic form. For the particle we obtain a one-parameter family of orbits parameterized by creation-annihilation variables, which leads to the Holstein-Primakoff realization of the isometry group generators. The scheme is then applied to spinning string solutions characterized by one winding number in AdS_3 and two winding numbers in S^3. We find a two-parameter family of orbits, where quantization again provides the Holstein-Primakoff realization of the symmetry generators with an oscillator type energy spectrum. Analyzing the minimal energy at strong coupling we verify the spectrum of short strings at special values of winding numbers.