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

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Title: Lensing-induced morphology changes in CMB temperature maps in modified gravity theories
Authors: Munshi, D
Hu, B
Matsubara, T
Coles, P
Heavens, A
Item Type: Journal Article
Abstract: 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.
Issue Date: 28-Apr-2016
Date of Acceptance: 11-Apr-2016
URI: http://hdl.handle.net/10044/1/48293
DOI: https://dx.doi.org/10.1088/1475-7516/2016/04/056
ISSN: 1475-7516
Publisher: IOP Publishing
Journal / Book Title: Journal of Cosmology and Astroparticle Physics
Volume: 2016
Issue: 4
Copyright Statement: © 2016 IOP Publishing Ltd and Sissa Medialab srl. This is an author-created, un-copyedited version of an article accepted for publication in Journal of Cosmology and Astroparticle Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at https://dx.doi.org/10.1088/1475-7516/2016/04/056
Sponsor/Funder: Imperial College Trust
Science and Technology Facilities Council
Science and Technology Facilities Council (STFC)
Funder's Grant Number: N/A
ST-N000838
ST/N000838/1
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
Physics, Particles & Fields
Physics
CMBR theory
modified gravity
non-gaussianity
PRIMORDIAL NON-GAUSSIANITY
MICROWAVE BACKGROUND POLARIZATION
LARGE-SCALE STRUCTURE
MINKOWSKI FUNCTIONALS
POWER SPECTRUM
STATISTICS
TRISPECTRUM
BISPECTRUM
Nuclear & Particles Physics
0201 Astronomical And Space Sciences
0202 Atomic, Molecular, Nuclear, Particle And Plasma Physics
Publication Status: Published
Article Number: ARTN 056
Appears in Collections:Physics
Astrophysics



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