{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,16]],"date-time":"2025-12-16T09:55:21Z","timestamp":1765878921542,"version":"3.48.0"},"reference-count":37,"publisher":"World Scientific Pub Co Pte Ltd","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Mod. Phys. Lett. A"],"abstract":"<jats:p>This paper presents the C++ code RelExt for Standard Model extensions with a Dark Matter candidate. The code implements efficient scan algorithms for the search of parameter configurations in these models that lead to relic densities compatible with the measured value, where the relic density is calculated for freeze-out (co-)annihilation processes. The code comes with several pre-installed models and supports any arbitrary other model with a discrete [Formula: see text] symmetry, once the FeynRules model file is provided by the user. The code generates the required (co-)annihilation amplitudes and thermally averaged cross-sections automatically and solves the Boltzmann equation to determine the relic density.<\/jats:p>","DOI":"10.1142\/s021773232541010x","type":"journal-article","created":{"date-parts":[[2025,12,16]],"date-time":"2025-12-16T09:50:33Z","timestamp":1765878633000},"source":"Crossref","is-referenced-by-count":0,"title":["<tt>RelExt<\/tt>\n                    : A new tool for dark matter parameter searches"],"prefix":"10.1142","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7514-3503","authenticated-orcid":false,"given":"Rodrigo","family":"Capucha","sequence":"first","affiliation":[{"name":"Centro de F\u00edsica Te\u00f3rica e Computacional, Faculdade de Ci\u00eancias, Universidade de Lisboa, Campo Grande, Edif\u00edcio C8 1749-016, Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-0131-5233","authenticated-orcid":false,"given":"Karim","family":"Elyaouti","sequence":"additional","affiliation":[{"name":"Institute for Theoretical Physics, Karlsruhe Institute of Technology, Wolfgang-Gaede-Str. 1 76131, Karlsruhe, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3922-0281","authenticated-orcid":false,"given":"Margarete","family":"M\u00fchlleitner","sequence":"additional","affiliation":[{"name":"Institute for Theoretical Physics, Karlsruhe Institute of Technology, Wolfgang-Gaede-Str. 1 76131, Karlsruhe, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-6128-128X","authenticated-orcid":false,"given":"Johann","family":"Plotnikov","sequence":"additional","affiliation":[{"name":"Institute for Theoretical Physics, Karlsruhe Institute of Technology, Wolfgang-Gaede-Str. 1 76131, Karlsruhe, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7948-0355","authenticated-orcid":false,"given":"Rui","family":"Santos","sequence":"additional","affiliation":[{"name":"Centro de F\u00edsica Te\u00f3rica e Computacional, Faculdade de Ci\u00eancias, Universidade de Lisboa, Campo Grande, Edif\u00edcio C8 1749-016, Lisboa, Portugal"},{"name":"ISEL - Instituto Superior de Engenharia de Lisboa, Instituto Polit\u00e9cnico de Lisboa 1959-007 Lisboa, Portugal"}]}],"member":"219","published-online":{"date-parts":[[2025,12,17]]},"reference":[{"key":"S021773232541010XBIB001","doi-asserted-by":"publisher","DOI":"10.1016\/S1387-6473(02)00245-2"},{"key":"S021773232541010XBIB002","doi-asserted-by":"publisher","DOI":"10.1086\/345423"},{"key":"S021773232541010XBIB003","doi-asserted-by":"publisher","DOI":"10.1086\/383243"},{"key":"S021773232541010XBIB004","doi-asserted-by":"publisher","DOI":"10.1046\/j.1365-8711.2003.06055.x"},{"key":"S021773232541010XBIB005","doi-asserted-by":"publisher","DOI":"10.1086\/150317"},{"key":"S021773232541010XBIB006","doi-asserted-by":"publisher","DOI":"10.1086\/381970"},{"key":"S021773232541010XBIB007","doi-asserted-by":"publisher","DOI":"10.1007\/JHEP03(2010)080"},{"key":"S021773232541010XBIB008","doi-asserted-by":"publisher","DOI":"10.1016\/B978-1-4831-9921-4.50011-9"},{"key":"S021773232541010XBIB009","doi-asserted-by":"publisher","DOI":"10.1016\/j.physrep.2004.08.031"},{"key":"S021773232541010XBIB010","unstructured":"Planck. (N. Aghanim\n                      et al.\n                      ),\n                      Astron. Astrophys.\n                      641\n                      , A6 (2020) [Erratum-ibid.\n                      652\n                      , C4 (2021)]."},{"key":"S021773232541010XBIB011","first-page":"001","volume":"2020","author":"Arina C.","year":"2021","journal-title":"PoS"},{"key":"S021773232541010XBIB012","unstructured":"R. Capucha, K. Elyaouti, M. M. M\u00fchlleitner, J. Plotnikov and R. Santos (2025), arXiv: 2503.13087."},{"key":"S021773232541010XBIB013","doi-asserted-by":"publisher","DOI":"10.1016\/j.cpc.2014.04.012"},{"key":"S021773232541010XBIB014","doi-asserted-by":"publisher","DOI":"10.1140\/epjc\/s10052-013-2428-4"},{"key":"S021773232541010XBIB015","doi-asserted-by":"publisher","DOI":"10.1140\/epjc\/s10052-022-10139-w"},{"key":"S021773232541010XBIB016","doi-asserted-by":"publisher","DOI":"10.1016\/j.cpc.2018.11.006"},{"key":"S021773232541010XBIB017","doi-asserted-by":"publisher","DOI":"10.1016\/j.cpc.2021.108124"},{"key":"S021773232541010XBIB018","doi-asserted-by":"publisher","DOI":"10.1016\/j.cpc.2025.109766"},{"key":"S021773232541010XBIB019","doi-asserted-by":"publisher","DOI":"10.1007\/JHEP06(2016)034"},{"key":"S021773232541010XBIB020","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.79.015018"},{"key":"S021773232541010XBIB021","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.86.043511"},{"key":"S021773232541010XBIB022","doi-asserted-by":"publisher","DOI":"10.1007\/JHEP08(2017)132"},{"key":"S021773232541010XBIB023","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.97.015005"},{"key":"S021773232541010XBIB024","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.106.095030"},{"key":"S021773232541010XBIB025","doi-asserted-by":"publisher","DOI":"10.1007\/JHEP11(2023)116"},{"key":"S021773232541010XBIB026","doi-asserted-by":"publisher","DOI":"10.1007\/JHEP08(2020)085"},{"key":"S021773232541010XBIB027","doi-asserted-by":"publisher","DOI":"10.1007\/JHEP10(2021)044"},{"key":"S021773232541010XBIB028","doi-asserted-by":"publisher","DOI":"10.1007\/JHEP11(2018)091"},{"key":"S021773232541010XBIB029","doi-asserted-by":"publisher","DOI":"10.1140\/epjc\/s10052-023-11612-w"},{"key":"S021773232541010XBIB030","first-page":"024","volume":"2022","author":"Biermann L.","year":"2024","journal-title":"PoS"},{"key":"S021773232541010XBIB031","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.93.055012"},{"key":"S021773232541010XBIB032","doi-asserted-by":"publisher","DOI":"10.1140\/epjc\/s10052-020-7655-x"},{"key":"S021773232541010XBIB033","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.102.075009"},{"key":"S021773232541010XBIB034","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.106.095032"},{"key":"S021773232541010XBIB035","doi-asserted-by":"publisher","DOI":"10.1016\/S0010-4655(97)00123-9"},{"key":"S021773232541010XBIB036","doi-asserted-by":"publisher","DOI":"10.1016\/j.cpc.2018.12.010"},{"key":"S021773232541010XBIB037","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.50.3637"}],"container-title":["Modern Physics Letters A"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.worldscientific.com\/doi\/pdf\/10.1142\/S021773232541010X","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,12,16]],"date-time":"2025-12-16T09:50:45Z","timestamp":1765878645000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.worldscientific.com\/doi\/10.1142\/S021773232541010X"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,12,17]]},"references-count":37,"alternative-id":["10.1142\/S021773232541010X"],"URL":"https:\/\/doi.org\/10.1142\/s021773232541010x","relation":{},"ISSN":["0217-7323","1793-6632"],"issn-type":[{"value":"0217-7323","type":"print"},{"value":"1793-6632","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,12,17]]},"article-number":"2541010"}}