Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.171302
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Funding
- FCT-Portugal Project [PTDC/FIS/100170/2008]
- FCT-Portugal [SFRH/BPD/80274/2011]
- STFC
- BIPAC
- Leverhulme Trust
- Oxford Martin School
- Science and Technology Facilities Council [ST/K00106X/1, ST/I00193X/1] Funding Source: researchfish
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/80274/2011] Funding Source: FCT
- STFC [ST/K00106X/1, ST/I00193X/1] Funding Source: UKRI
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The large-scale structure of the Universe supplies crucial information about the physical processes at play at early times. Unresolved maps of the intensity of 21 cm emission from neutral hydrogen HI at redshifts z similar or equal to 1-5 are the best hope of accessing the ultralarge-scale information, directly related to the early Universe. A purpose-built HI intensity experiment may be used to detect the large scale effects of primordial non-Gaussianity, placing stringent bounds on different models of inflation. We argue that it may be possible to place tight constraints on the non-Gaussianity parameter f(NL), with an error close to sigma(fNL) similar to 1.
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