Real homotopy theory and supersymmetric quantum mechanics

TL;DR

This paper explores the relationship between geometry, supersymmetric quantum mechanics, and string backgrounds, revealing how homotopy theory and entanglement relate to physical models and string compactifications.

Contribution

It reinterprets rational homotopy theory within supersymmetric quantum mechanics, linking Massey products to vacuum states and uncovering new insights into the geometric encoding in physics.

Findings

Massey products correspond to supersymmetric vacuum states.

Minimal models of rational homotopy are realized as supersymmetric Fock spaces.

A numerical coincidence suggests a deeper link in string compactification.

Abstract

In the context of studying string backgrounds, much work has been devoted to the question of how similar a general quantum field theory (specifically, a two-dimensional superconformal theory) is to a sigma model. Put differently, one would like to know how well or poorly one can understand the physics of string backgrounds in terms of concepts of classical geometry. Much attention has also been given of late to the question of how geometry can be encoded in a microscopic physical description that makes no explicit reference to space and time. We revisit the first question, and review both well-known and less well-known results about geometry and sigma models from the perspective of dimensional reduction to supersymmetric quantum mechanics. The consequences of arising as the dimensional reduction of a $d$-dimensional theory for the resulting quantum mechanics are explored. In this context, we reinterpret the minimal models of rational (more precisely, complex) homotopy theory as certain supersymmetric Fock spaces, with unusual actions of the supercharges. The data of the Massey products appear naturally as supersymmetric vacuum states that are entangled between different degrees of freedom. This connection between entanglement and geometry is, as far as we know, not well-known to physicists. In addition, we take note of an intriguing numerical coincidence in the context of string compactification on hyper-Kahler eight-manifolds.