Cosmic shear bispectrum from second-order perturbations in general relativity
نویسندگان
چکیده
منابع مشابه
Cosmic Microwave Background anisotropies from second order gravitational perturbations
This paper presents a complete analysis of the effects of second order gravitational perturbations on Cosmic Microwave Background anisotropies, taking explicitly into account scalar, vector and tensor modes. We also consider the second order perturbations of the metric itself obtaining them, for a universe dominated by a collision-less fluid, in the Poisson gauge, by transforming the known resu...
متن کاملCMB anisotropies at second order III: bispectrum from products of the first-order perturbations
We calculate the bispectrum of the Cosmic Microwave Background (CMB) temperature anisotropies induced by the second-order fluctuations in the Boltzmann equation. In this paper, which is one of a series of papers on the numerical calculation of the bispectrum from the second-order fluctuations, we consider the terms that are products of the first-order perturbations, and leave intrinsically seco...
متن کاملThe bispectrum of matter perturbations from cosmic strings
We present the first calculation of the bispectrum of the matter perturbations induced by cosmic strings. The calculation is performed in two different ways: the first uses the unequal time correlators (UETCs) of the string network computed using a Gaussian model previously employed for cosmic string power spectra. The second approach uses the wake model, where string density perturbations are ...
متن کاملCosmological parameters from combined second - and third - order aperture mass statistics of cosmic shear
We present predictions for cosmological parameter constraints from combined measurements of secondand thirdorder statistics of cosmic shear. We define the generalized third-order aperture mass statistics 〈M3 ap〉 and show that it contains much more information about the bispectrum of the projected matter density than the skewness of the aperture mass. From theoretical models as well as from ΛCDM...
متن کامل“ Gauge ” in General Relativity : — Second - order general relativistic gauge - invariant perturbation theory —
As in the case of the other gauge field theories, there is so called “gauge” also in general relativity. This “gauge” is unphysical degree of freedom. There are two kinds of “gauges” in general relativity. These are called the firstand the second-kind of gauges, respectively. The gauge of the first kind is just coordinate system on a single manifold. On the other hand, the gauge of the second k...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review D
سال: 2012
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.86.023001