Journal
PHYSICAL REVIEW LETTERS
Volume 121, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.101301
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Funding
- NASA [NNX15AL17G]
- NASA [NNX15AL17G, 799149] Funding Source: Federal RePORTER
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We develop a new method to constrain primordial non-Gaussianities of the local kind using unclustered tracers of the large scale structure. We show that, in the limit of low noise, zero bias tracers yield large improvement over standard methods, mostly due to vanishing sampling variance. We propose a simple technique to construct such a tracer, using environmental information obtained from the original sample and validate our method with N-body simulations. Our results indicate that sigma(loc)(NL) similar or equal to 1 can be reached using only information on a single tracer of sufficiently high number density.
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