Neutrino physics from future weak lensing surveys
نویسندگان
چکیده
منابع مشابه
Neutrino physics from future weak lensing surveys
Given recent indications of additional neutrino species and cosmologically significant neutrino masses, we analyze their signatures in the weak lensing shear power spectrum. We find that a shear deficit in the 20-40% range or excess in the 20-80% range cannot be explained by variations in parameters of the flat ΛCDM model that are allowed by current observations of the expansion history from Ty...
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We present a survey of the cosmological applications of the next generation of weak lensing surveys, paying special attention to the computational challenges presented by the number of galaxies, N gal ∼ 10 5. We focus on optimal methods with no pixelization and derive a multigrid P 3 M algorithm that performs the relevant computations in O(N gal log N gal) time. We test the algorithm by studyin...
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Focusing on the well motivated aperture mass statistics Map, we study the possibility of constraining cosmological parameters using future space based SNAP class weak lensing missions. Using completely analytical results we construct the covariance matrix for estimators based on two-point and three-point statistics. Our approach incorporates an accurate modelling of higher-order statistics to d...
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Weak gravitational lensing is responsible for the shearing and magnification of the images of high-redshift sources due to the presence of intervening mass. Since the lensing effects arise from deflections of the light rays due to fluctuations of the gravitational potential, they can be directly related to the underlying density field of the large-scale structures. Weak gravitational surveys ar...
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The distortion of the images of faint high-redshift galaxies can be used to probe the intervening mass distribution. This weak gravitaional lensing effect has been used recently to study the (projected) mass distribution of several clusters at intermediate and high redshifts. In addition, the weak lensing effect can be employed to detect (dark) matter concentrations in the Universe, based on th...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2013
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.87.063510