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- W2077819488 abstract "We show that modified gravity presents distinctive nonlinear features on the Cosmic Microwave Background (CMB) anisotropies comparing with General Relativity (GR). We calculate the contribution to the CMB non-Gaussianity from nonlinear Sachs-Wolfe effect in $f(R)$ gravity and show that, contrary to GR's contribution which is typically $lesssim mathcal{O}(1)$, the contribution in $f(R)$ gravity is sensitive to the nonlinear structure of $f(R)$ and can be large in principle. Optimistically, this gives an alternative origin for the possibly observed large CMB non-Gaussianities besides the primordial ones. On the other hand, such nonlinear features can be employed to provide a new cosmological test of $f(R)$ or other modified theories of gravitation, which is unique and independent of previously known tests." @default.
- W2077819488 created "2016-06-24" @default.
- W2077819488 creator A5065838437 @default.
- W2077819488 date "2011-08-01" @default.
- W2077819488 modified "2023-09-30" @default.
- W2077819488 title "Testing gravity with non-Gaussianity" @default.
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- W2077819488 doi "https://doi.org/10.1016/j.physletb.2011.07.022" @default.
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