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Lensing-induced morphology changes in CMB temperature maps in modified gravity theories

Munshi, D., Hu, B., Matsubara, T., Coles, P. and Heavens, A. 2016. Lensing-induced morphology changes in CMB temperature maps in modified gravity theories. Journal of Cosmology and Astroparticle Physics 2016 (4) , 056. 10.1088/1475-7516/2016/04/056

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Lensing of the Cosmic Microwave Background (CMB) changes the morphology of pattern of temperature fluctuations, so topological descriptors such as Minkowski Functionals can probe the gravity model responsible for the lensing. We show how the recently introduced two-to-two and three-to-one kurt-spectra (and their associated correlation functions), which depend on the power spectrum of the lensing potential, can be used to probe modified gravity theories such as f(R) theories of gravity and quintessence models. We also investigate models based on effective field theory, which include the constant-Ω model, and low-energy Hořava theories. Estimates of the cumulative signal-to-noise for detection of lensing-induced morphology changes, reaches Script O(103) for the future planned CMB polarization mission COrE+. Assuming foreground removal is possible to ℓmax=3000, we show that many modified gravity theories can be rejected with a high level of significance, making this technique comparable in power to galaxy weak lensing or redshift surveys. These topological estimators are also useful in distinguishing lensing from other scattering secondaries at the level of the four-point function or trispectrum. Examples include the kinetic Sunyaev-Zel'dovich (kSZ) effect which shares, with lensing, a lack of spectral distortion. We also discuss the complication of foreground contamination from unsubtracted point sources.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Additional Information: PDF uploaded in accordance with publisher's policies at (accessed 14.7.17).
Publisher: IOP Publishing
ISSN: 1475-7516
Funders: Science and Technology Facilites Council (STFC)
Date of First Compliant Deposit: 31 May 2017
Date of Acceptance: 11 April 2016
Last Modified: 15 Apr 2020 15:00

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