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We investigate the detectability of leading-order relativistic effects in thebispectrum of future 21cm intensity mapping surveys. The relativistic signalarises from Doppler and other line-of-sight effects in redshift space. In thepower spectrum of a single tracer, these effects are suppressed by a factor$\cH^2/k^2$. By contrast, in the bispectrum the relativistic signal couples toshort-scale modes, leading to an imaginary contribution that scales as $\cH/k$,thus increasing the possibility of detection. Previous work has shown that thisrelativistic signal is detectable in a Stage IV H$\alpha$ galaxy survey. {Weshow that the signal is also detectable by next-generation 21cm intensity maps,but typically with a lower signal-to-noise, due to foreground and telescopebeam effects.

Detecting the relativistic bispectrum in 21cm intensity maps