Ultralarge-scale limits on primordial non-Gaussinianity |
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The
large-scale structure of the Universe supplies crucial information
about the physical processes at play at early times. However, usual
galaxy surveys - even from the next-generation of telescopes and
satellites - will not be able to probe the largest cosmic scales. In a
recently published Physical Review Letters.
CENTRA's researchers Stefano Camera, Mário Santos and Luís Ferramacho
have investigated a novel, cheap and feasible way to eventually access
such ultralarge scale information. Unresolved maps of the intensity of
21 cm emission from neutral hydrogen HI at redshifts z~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 ~1 |
Last Updated on Tuesday, 29 October 2013 15:01 |