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We formulate a sentinel-triggered competitive susceptible\u2013infected\u2013susceptible\u2013AB model on a simplicial complex with two equal-sized communities. Sentinels respond to local misinformation exposure by temporarily becoming truth sources, coupling local detection and corrective response with higher-order reinforcement and cross-community invasion. We derive a heterogeneous mean-field description and compare its predictions with Monte Carlo simulations. The results reveal extinction, community-localized persistence, and network-wide spreading, separated by discontinuous transitions and initial-condition-dependent hysteresis in the examined parameter ranges. Increasing the sentinel fraction or the pairwise truth-spreading strength suppresses the high-misinformation state, whereas a higher sentinel activation threshold delays the response. Intercommunity coupling promotes misinformation invasion under weak intervention but can support truth spreading when sentinel intervention is sufficiently strong. Extensions to unequal community sizes and more general community structures remain topics for future work.<\/jats:p>","DOI":"10.1063\/5.0356660","type":"journal-article","created":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T14:50:09Z","timestamp":1791989409000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Competitive spreading dynamics under sentinel intervention in higher-order community networks"],"prefix":"10.1063","volume":"36","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0586-7132","authenticated-orcid":false,"given":"Hao","family":"Peng","sequence":"first","affiliation":[{"name":"School of Computer Science and Technology, Zhejiang Normal University 1 , Jinhua 321004, Zhejiang,","place":["China"]},{"name":"Key Laboratory of Intelligent Education Technology and Application of Zhejiang Province, Zhejiang Normal University 2 , Jinhua 321004, Zhejiang,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-8905-5998","authenticated-orcid":false,"given":"Zidi","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Computer Science and Technology, Zhejiang Normal University 1 , Jinhua 321004, Zhejiang,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanggang","family":"Cheng","sequence":"additional","affiliation":[{"name":"School of Computer Science and Technology, Zhejiang Normal University 1 , Jinhua 321004, Zhejiang,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bo","family":"Zhang","sequence":"additional","affiliation":[{"name":"China Electric Power Research Institute 3 , Beijing 100192,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9132-3782","authenticated-orcid":false,"given":"Ming","family":"Zhong","sequence":"additional","affiliation":[{"name":"School of Computer Science and Technology, Zhejiang Normal University 1 , Jinhua 321004, Zhejiang,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shenghong","family":"Li","sequence":"additional","affiliation":[{"name":"School of Cyber Science and Engineering, Shanghai Jiao Tong University 4 , Shanghai 200240,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dandan","family":"Zhao","sequence":"additional","affiliation":[{"name":"School of Computer Science and Technology, Zhejiang Normal University 1 , Jinhua 321004, Zhejiang,","place":["China"]},{"name":"Key Laboratory of Intelligent Education Technology and Application of Zhejiang Province, Zhejiang Normal University 2 , Jinhua 321004, Zhejiang,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4088-5395","authenticated-orcid":false,"given":"Wei","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Public Health, Chongqing Medical University 5 , Chongqing 400016,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2026,10,14]]},"reference":[{"key":"2026101410500299300_c1","doi-asserted-by":"publisher","first-page":"073122","DOI":"10.1063\/5.0006984","article-title":"Rumor spreading: A trigger for proliferation or fading away","volume":"30","year":"2020","journal-title":"Chaos"},{"key":"2026101410500299300_c2","doi-asserted-by":"publisher","first-page":"113123","DOI":"10.1063\/1.5121394","article-title":"Misinformation spreading on correlated multiplex networks","volume":"29","year":"2019","journal-title":"Chaos"},{"key":"2026101410500299300_c3","doi-asserted-by":"publisher","first-page":"554","DOI":"10.1073\/pnas.1517441113","article-title":"The spreading of misinformation online","volume":"113","year":"2016","journal-title":"Proc. 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