English

On the $\Delta_a$ invariants in non-perturbative complex Chern-Simons theory

Geometric Topology 2025-12-09 v2 High Energy Physics - Theory Mathematical Physics math.MP Quantum Algebra

Abstract

Recently a set of qq-series invariants, labelled by Spinc\operatorname{Spin}^c structures, for weakly negative definite plumbed 33-manifolds called the Z^a\widehat{Z}_a invariants were discovered by Gukov, Pei, Putrov and Vafa. The leading rational power of the Z^a\widehat{Z}_a invariants are invariants themselves denoted by Δa\Delta_a. In this paper we further analyze the structure of these Δa\Delta_a invariants. We review some of the foundations of the Δa\Delta_a invariants and analyze their structure for a subclass of integer homology spheres. In particular, we provide a complete description of the Δ0\Delta_0 invariants for Brieskorn spheres. Along the way we show that the Δa\Delta_a invariants are not homology cobordism invariants, thereby answering an open question in the literature.

Keywords

Cite

@article{arxiv.2306.11298,
  title  = {On the $\Delta_a$ invariants in non-perturbative complex Chern-Simons theory},
  author = {Shimal Harichurn},
  journal= {arXiv preprint arXiv:2306.11298},
  year   = {2025}
}

Comments

27 Pages. Comments are welcome. Removed Proposition 5.7 in previous version of paper which may be erroneous. To prepare for journal submission, the claims in Section 4 of the previous version were removed, but still warrant investigation. Similarly Lemma 5.6 in the previous version was removed as it was redundant