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2018

The CMB lensing bi-spectrum as a probe of modified gravity theories

Namikawa, Toshiya, Bouchet, François R., Taruya, Atsushi

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Cosmological structures grow differently in theories of gravity which are modified as compared to Einstein's General relativity (GR).

Cosmic microwave background (CMB) fluctuation patterns at the last scattering surface are lensed by these structures along the photon path to the observer.
The observed CMB pattern therefore keeps trace of the growth history of structures.
We show that observations of the CMB lensing bi-spectrum offer an interesting way to constrain deviations from GR in a broad class of scalar-tensor theories of gravity called "beyond Horndeski".

The CMB lensing bi-spectrum as a probe of modified gravity theories · Around

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