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DC Field | Value | Language |
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dc.contributor.author | Roldan, Omar | - |
dc.contributor.author | Notari, Alessio | - |
dc.contributor.author | Quartin, Miguel | - |
dc.date.accessioned | 2019-02-14T11:19:40Z | - |
dc.date.available | 2019-02-14T11:19:40Z | - |
dc.date.issued | 2016-06-10 | - |
dc.identifier.issn | 1475-7516 | - |
dc.identifier.uri | http://hdl.handle.net/2445/128239 | - |
dc.description.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. | - |
dc.format.extent | 31 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Institute of Physics (IOP) | - |
dc.relation.isformatof | Reproducció del document publicat a: https://doi.org/10.1088/1475-7516/2016/06/026 | - |
dc.relation.ispartof | Journal of Cosmology and Astroparticle Physics, 2016, vol. 2016 | - |
dc.relation.uri | https://doi.org/10.1088/1475-7516/2016/06/026 | - |
dc.rights | cc-by (c) Roldan, Omar et al., 2016 | - |
dc.rights.uri | http://creativecommons.org/licenses/by/3.0/es | - |
dc.source | Articles publicats en revistes (Física Quàntica i Astrofísica) | - |
dc.subject.classification | Cosmologia | - |
dc.subject.classification | Aberració (Astronomia) | - |
dc.subject.other | Cosmology | - |
dc.subject.other | Aberration | - |
dc.title | Interpreting the CMB aberration and Doppler measurements: boost or intrinsic dipole? | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 669247 | - |
dc.date.updated | 2019-02-14T11:19:40Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
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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File | Description | Size | Format | |
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669247.pdf | 1.06 MB | Adobe PDF | View/Open |
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