The persistence barcode is a topological descriptor of data that plays a fundamental role in topological data analysis. Given a filtration of data, the persistence barcode tracks the evolution of its homology groups. In this paper, we introduce a new type of barcode, called the harmonic chain barcode, which tracks the evolution of harmonic chains. In addition, we show that the harmonic chain barcode is stable. Given a filtration of a simplicial complex of size m, we present an algorithm to compute its harmonic chain barcode in O(m³) time. Consequently, the harmonic chain barcode can enrich the family of topological descriptors in applications where a persistence barcode is applicable, such as feature vectorization and machine learning.
@InProceedings{hou_et_al:LIPIcs.SoCG.2025.58, author = {Hou, Tao and Parsa, Salman and Wang, Bei}, title = {{Tracking the Persistence of Harmonic Chains: Barcode and Stability}}, booktitle = {41st International Symposium on Computational Geometry (SoCG 2025)}, pages = {58:1--58:16}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-370-6}, ISSN = {1868-8969}, year = {2025}, volume = {332}, editor = {Aichholzer, Oswin and Wang, Haitao}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.SoCG.2025.58}, URN = {urn:nbn:de:0030-drops-232100}, doi = {10.4230/LIPIcs.SoCG.2025.58}, annote = {Keywords: Persistent homology, harmonic chains, topological data analysis} }
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