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By contrast, in the bispectrum the relativistic signal couples to short-scale modes, leading to\nan imaginary contribution that scales as \t\n\u210b\/k, thus increasing the possibility of detection.\nPrevious work has shown that this relativistic signal is detectable in a Stage IV H\u03b1 galaxy survey.\nWe show that the signal is also detectable by next-generation  21cm intensity maps, but typically with a lower signal-to-noise, due to foreground and telescope beam effects.<\/jats:p>","DOI":"10.1088\/1475-7516\/2021\/06\/039","type":"journal-article","created":{"date-parts":[[2021,6,22]],"date-time":"2021-06-22T13:35:59Z","timestamp":1624368959000},"page":"039","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":24,"title":["Detecting the relativistic bispectrum in 21cm intensity maps"],"prefix":"10.1088","volume":"2021","author":[{"given":"Sheean","family":"Jolicoeur","sequence":"first","affiliation":[]},{"given":"Roy","family":"Maartens","sequence":"additional","affiliation":[]},{"given":"Eline M.","family":"De Weerd","sequence":"additional","affiliation":[]},{"given":"Obinna","family":"Umeh","sequence":"additional","affiliation":[]},{"given":"Chris","family":"Clarkson","sequence":"additional","affiliation":[]},{"given":"Stefano","family":"Camera","sequence":"additional","affiliation":[]}],"member":"266","published-online":{"date-parts":[[2021,6,22]]},"reference":[{"key":"bbe1dd85b4bd7a43b4a4ec956ca0932ba","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevD.92.083532","article-title":"Fast Estimators for Redshift-Space Clustering","volume":"92","author":"Scoccimarro","year":"2015","journal-title":"Phys. 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