Sökning: WFRF:(PIACENTINI S) > Planck 2015 results...
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000 | 11733naa a2203073 4500 | |
001 | oai:DiVA.org:su-140350 | |
003 | SwePub | |
008 | 170308s2016 | |||||||||||000 ||eng| | |
024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1403502 URI |
024 | 7 | a https://doi.org/10.1051/0004-6361/2015258292 DOI |
040 | a (SwePub)su | |
041 | a engb eng | |
042 | 9 SwePub | |
072 | 7 | a ref2 swepub-contenttype |
072 | 7 | a art2 swepub-publicationtype |
100 | 1 | a Ade, P. A. R.4 aut |
245 | 1 0 | a Planck 2015 results XVIII. Background geometry and topology of the Universe |
264 | c 2016-09-20 | |
264 | 1 | b EDP Sciences,c 2016 |
338 | a print2 rdacarrier | |
520 | a Maps of cosmic microwave background (CMB) temperature and polarization from the 2015 release of Planck data provide the highest quality full-sky view of the surface of last scattering available to date. This enables us to detect possible departures from a globally isotropic cosmology. We present the first searches using CMB polarization for correlations induced by a possible non-trivial topology with a fundamental domain that intersects, or nearly intersects, the last-scattering surface (at comoving distance chi(rec)), both via a direct scan for matched circular patterns at the intersections and by an optimal likelihood calculation for specific topologies. We specialize to flat spaces with cubic toroidal (T3) and slab (T1) topologies, finding that explicit searches for the latter are sensitive to other topologies with antipodal symmetry. These searches yield no detection of a compact topology with a scale below the diameter of the last-scattering surface. The limits on the radius R-i of the largest sphere inscribed in the fundamental domain (at log-likelihood ratio Delta ln L > -5 relative to a simply-connected flat Planck best-fit model) are: R-i > 0.97 chi(rec) for the T3 cubic torus; and R-i > 0.56 chi(rec) for the T1 slab. The limit for the T3 cubic torus from the matched-circles search is numerically equivalent, R-i > 0.97 chi(rec) at 99% confidence level from polarization data alone. We also perform a Bayesian search for an anisotropic global Bianchi VIIh geometry. In the non-physical setting, where the Bianchi cosmology is decoupled from the standard cosmology, Planck temperature data favour the inclusion of a Bianchi component with a Bayes factor of at least 2.3 units of log-evidence. However, the cosmological parameters that generate this pattern are in strong disagreement with those found from CMB anisotropy data alone. Fitting the induced polarization pattern for this model to the Planck data requires an amplitude of -0.10 +/- 0.04 compared to the value of + 1 if the model were to be correct. In the physically motivated setting, where the Bianchi parameters are coupled and fitted simultaneously with the standard cosmological parameters, we find no evidence for a Bianchi VIIh cosmology and constrain the vorticity of such models to (omega/H)(0) < 7.6 x 10(-10) (95% CL). | |
650 | 7 | a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe |
650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng |
653 | a cosmic background radiation | |
653 | a cosmology: observations | |
653 | a cosmological parameters | |
653 | a gravitation | |
653 | a methods: data analysis | |
653 | a methods:statistical | |
700 | 1 | a Aghanim, N.4 aut |
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700 | 1 | a Gudmundsson, Jón E.u Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC),Nordiska institutet för teoretisk fysik (Nordita),Princeton University, USA4 aut0 (Swepub:su)jgudm |
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710 | 2 | a Stockholms universitetb Fysikum4 org |
773 | 0 | t Astronomy and Astrophysicsd : EDP Sciencesg 594q 594x 0004-6361x 1432-0746 |
856 | 4 | u https://doi.org/10.1051/0004-6361/201525829y Fulltext |
856 | 4 | u https://www.aanda.org/articles/aa/pdf/2016/10/aa25829-15.pdf |
856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-140350 |
856 | 4 8 | u https://doi.org/10.1051/0004-6361/201525829 |
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