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Title: | Interpreting the CMB aberration and Doppler measurements: boost or intrinsic dipole? |
Author: | Roldan, Omar Notari, Alessio Quartin, Miguel |
Keywords: | Cosmologia Aberració (Astronomia) Cosmology Aberration |
Issue Date: | 10-Jun-2016 |
Publisher: | Institute of Physics (IOP) |
Abstract: | The aberration and Doppler coupling effects of the Cosmic Microwave Background (CMB) were recently measured by the Planck satellite. The most straightforward interpretation leads to a direct detection of our peculiar velocity β, consistent with the measurement of the well-known dipole. In this paper we discuss the assumptions behind such interpretation. We show that Doppler-like couplings appear from two effects: our peculiar velocity and a second order large-scale effect due to the dipolar part of the gravitational potential. We find that the two effects are exactly degenerate but only if we assume second-order initial conditions from single-field Inflation. Thus, detecting a discrepancy in the value of β from the dipole and the Doppler couplings implies the presence of a primordial non-Gaussianity. We also show that aberration-like signals likewise arise from two independent effects: our peculiar velocity and lensing due to a first order large-scale dipolar gravitational potential, independently on Gaussianity of the initial conditions. In general such effects are not degenerate and so a discrepancy between the measured β from the dipole and aberration could be accounted for by a dipolar gravitational potential. Only through a fine-tuning of the radial profile of the potential it is possible to have a complete degeneracy with a boost effect. Finally we discuss that we also expect other signatures due to integrated second order terms, which may be further used to disentangle this scenario from a simple boost. |
Note: | Reproducció del document publicat a: https://doi.org/10.1088/1475-7516/2016/06/026 |
It is part of: | Journal of Cosmology and Astroparticle Physics, 2016, vol. 2016 |
URI: | http://hdl.handle.net/2445/128239 |
Related resource: | https://doi.org/10.1088/1475-7516/2016/06/026 |
ISSN: | 1475-7516 |
Appears in Collections: | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) Articles publicats en revistes (Física Quàntica i Astrofísica) |
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669247.pdf | 1.06 MB | Adobe PDF | View/Open |
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