CMB lensing extraction and primordial non-Gaussianity
نویسندگان
چکیده
منابع مشابه
CMB lensing extraction and primordial non-Gaussianity
The next generation of CMB experiments should get a better handle on cosmological parameters by mapping the weak lensing deflection field, which is separable from primary anisotropies thanks to the non-Gaussianity induced by lensing. However, the generation of perturbations in the Early Universe also produces a level of non-Gaussianity which is known to be small, but can contribute to the aniso...
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Recent second-order perturbation computations have provided an accurate prediction for the primordial gravitational potential, Φ(x), in scenarios in which cosmological perturbations are generated either during or after inflation. This enables us to make realistic predictions for a nonGaussian part of Φ(x), which is generically written in momentum space as a double convolution of its Gaussian pa...
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A convincing detection of primordial non-Gaussianity in the local form of the bispectrum, whose amplitude is given by the ƒNL parameter, offers a powerful test of inflation. In this paper, we calculate the modification of two-point cross-correlation statistics of weak lensing—galaxy-galaxy lensing and galaxycosmic microwave background (CMB) crosscorrelation—due to ƒNL. We derive and calculate t...
متن کاملEffect of lensing non-Gaussianity on the CMB power spectra
Observed CMB anisotropies are lensed, and the lensed power spectra can be calculated accurately assuming the lensing deflections are Gaussian. However, the lensing deflections are actually slightly non-Gaussian due to both non-linear large-scale structure growth and post-Born corrections. We calculate the leading correction to the lensed CMB power spectra from the non-Gaussianity, which is dete...
متن کاملMeasuring primordial non-Gaussianity through weak lensing peak counts
We explore the possibility of detecting primordial non-Gaussianity of the local type using weak-lensing peak counts. We measure the peak abundance in sets of simulated weak-lensing maps corresponding to three models f NL = 0, 100, and 100. Using survey specifications similar to those of EUCLID and without assuming any knowledge of the lens and source redshifts, we find the peak functions of the...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2005
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.71.103514