A weak lensing view on primordial non-Gaussianities

Schaefer BM, Grassi A, Gerstenlauer M, Byrnes C (2011)
Monthly Notices of the Royal Astronomical Society 421(1): 797-807.

Download
No fulltext has been uploaded. References only!
Journal Article | Original Article | Published | English

No fulltext has been uploaded

Author
; ; ;
Abstract
We investigate the signature of primordial non-Gaussianities in the weak lensing bispectrum, in particular the signals generated by local, orthogonal and equilateral non-Gaussianities. The questions we address include the signal-to-noise ratio generated in the Euclid weak lensing survey (we find the 1sigma-errors for fNL are 200, 575 and 1628 for local, orthogonal and equilateral non-Gaussianities, respectively), misestimations of fNL if one chooses the wrong non-Gaussianity model (misestimations by up to a factor of +/-3 in fNL are possible, depending on the choice of the model), the probability of noticing such a mistake (improbably large values for the chi^2-functional occur from fNL 200 on), degeneracies of the primordial bispectrum with other cosmological parameters (only the matter density Omega_m plays a significant role), and the subtraction of the much larger, structure-formation generated bispectrum. If a prior on a standard wCDM-parameter set is available from Euclid and Planck, the structure formation bispectrum can be predicted accurately enough for subtraction, and any residual structure formation bispectrum would influence the estimation of fNL to a minor degree. Configuration-space integrations which appear in the evaluation of chi^2-functionals and related quantities can be carried out very efficiently with Monte-Carlo techniques, which reduce the complexity by a factor of O(10^4) while delivering sub-percent accuracies. Weak lensing probes smaller scales than the CMB and hence provide an additional constraint on non-Gaussianities, even though they are not as sensitive to primordial non-Gaussianities as the CMB.
Publishing Year
ISSN
PUB-ID

Cite this

Schaefer BM, Grassi A, Gerstenlauer M, Byrnes C. A weak lensing view on primordial non-Gaussianities. Monthly Notices of the Royal Astronomical Society. 2011;421(1):797-807.
Schaefer, B. M., Grassi, A., Gerstenlauer, M., & Byrnes, C. (2011). A weak lensing view on primordial non-Gaussianities. Monthly Notices of the Royal Astronomical Society, 421(1), 797-807. doi:10.1111/j.1365-2966.2011.20357.x
Schaefer, B. M., Grassi, A., Gerstenlauer, M., and Byrnes, C. (2011). A weak lensing view on primordial non-Gaussianities. Monthly Notices of the Royal Astronomical Society 421, 797-807.
Schaefer, B.M., et al., 2011. A weak lensing view on primordial non-Gaussianities. Monthly Notices of the Royal Astronomical Society, 421(1), p 797-807.
B.M. Schaefer, et al., “A weak lensing view on primordial non-Gaussianities”, Monthly Notices of the Royal Astronomical Society, vol. 421, 2011, pp. 797-807.
Schaefer, B.M., Grassi, A., Gerstenlauer, M., Byrnes, C.: A weak lensing view on primordial non-Gaussianities. Monthly Notices of the Royal Astronomical Society. 421, 797-807 (2011).
Schaefer, Bjoern Malte, Grassi, Alessandra, Gerstenlauer, Mischa, and Byrnes, Christian. “A weak lensing view on primordial non-Gaussianities”. Monthly Notices of the Royal Astronomical Society 421.1 (2011): 797-807.
This data publication is cited in the following publications:
This publication cites the following data publications:

Export

0 Marked Publications

Open Data PUB

Web of Science

View record in Web of Science®

Sources

arXiv 1107.1656

Inspire 917524

Search this title in

Google Scholar