Measuring the integrated Sachs-Wolfe effect
نویسندگان
چکیده
منابع مشابه
Measuring dark energy with the integrated Sachs-Wolfe effect
I present to this conference our latest measurements of the integrated Sachs-Wolfe (ISW) effect. After a brief review of the reasons for which this effect arises and of the technique to detect it by cross-correlating the cosmic microwave background (CMB) with the large scale structure of the Universe (LSS), I describe the current state of the art measurement. This is obtained from a combined an...
متن کاملNonlinear integrated Sachs-Wolfe effect
We discuss the nonlinear extension to the integrated Sachs-Wolfe effect ~ISW! resulting from the divergence of the large scale structure momentum density field. The nonlinear ISW effect leads to an increase in the total ISW contribution by roughly two orders of magnitude at l;1000. This increase, however, is still below the cosmic variance limit of the primary anisotropies; at further small ang...
متن کاملADetection of the Integrated Sachs-Wolfe Effect
We have detected statistically significant correlations between the cosmic microwave background and two tracers of large-scale structure, the HEAO1 A2 full sky hard X-ray map (Boldt, 1987) and the NVSS 1.4 GHz, nearly full sky radio galaxy survey (Condon et al., 1998). The level of correlations in these maps is consistent with that predicted for the integrated Sachs-Wolfe (ISW) effect in the co...
متن کاملThe Sachs-Wolfe effect
We present a pedagogical derivation of the SachsWolfe effect, specifically the factor 3 relating the temperature fluctuations to gravitational potentials. The result arises from a cancellation between gravitational redshifts and intrinsic temperature fluctuations which can be derived from a coordinate transformation of the background.
متن کاملThe integrated Sachs-Wolfe effect and the SKA
An important probe of dark energy is the integrated Sachs-Wolfe effect, where cosmic microwave background anisotropies are generated at late times once the dark energy becomes important dynamically. This contribution briefly describes the effect and summarises the present observational evidence for it. A potential survey by the Square Kilometre Array (SKA) covering a large fraction of the sky c...
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: Astronomy & Astrophysics
سال: 2011
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201015893