Differential Contracting Homotopy in Higher-Spin Theory

TL;DR

This paper introduces a novel, simplified method for analyzing nonlinear higher-spin equations that uses homotopy parameters and auxiliary variables, enabling more efficient vertex reconstruction and insights into higher-order corrections.

Contribution

The paper develops a general, simpler approach to higher-spin equations that avoids complex identities and maps vertex reconstruction to polyhedra cohomology, advancing the study of higher-spin interactions.

Findings

Reproduces known lower-order vertices

Identifies projectively-compact vertices with minimal derivatives

Provides a new tool for higher-order correction analysis

Abstract

A new efficient approach to the analysis of nonlinear higher-spin equations, that treats democratically auxiliary spinor variables $Z_A$ and integration homotopy parameters in the non-linear vertices of the higher-spin theory, is developed. Being most general, the proposed approach is the same time far simpler than those available so far. In particular, it is free from the necessity to use the Schouten identity. Remarkably, the problem of reconstruction of higher-spin vertices is mapped to certain polyhedra cohomology in terms of homotopy parameters themselves. The new scheme provides a powerful tool for the study of higher-order corrections in higher-spin theory and, in particular, its spin-locality. It is illustrated by the analysis of the lower order vertices, reproducing not only the results obtained previously by the shifted homotopy approach but also projectively-compact vertices with the minimal number of derivatives, that were so far unreachable within that scheme.