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Cosmology on Ultra-Large Scales with HI Intensity Mapping Limits on Primordial non-Gaussianity

Cosmology on Ultra-Large Scales with HI Intensity Mapping Limits on Primordial non-Gaussianity

The large-scale structure of the Universe supplies crucial information aboutthe physical processes at play at early times. Unresolved maps of the intensityof 21 cm emission from neutral hydrogen, HI, at redshifts z~1-5 are the besthope of accessing the ultra large-scale information, directly related to theearly Universe. A purpose built HI intensity experiment may be used to detectthe large scale effects of primordial non-Gaussianity, placing stringent boundson different models of inflation. We argue that it may be possible to placetight constraints on the non-Gaussianity parameter, f_NL, with an error closeto ~1.

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