Generalized Lemaitre-Tolman-Bondi model with inhomogeneous isotropic dark energy: Observational constraints
| dc.contributor.author | Grande, J. | en |
| dc.contributor.author | Perivolaropoulos, L. | en |
| dc.date.accessioned | 2015-11-24T18:27:46Z | |
| dc.date.available | 2015-11-24T18:27:46Z | |
| dc.identifier.issn | 1550-7998 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/16088 | |
| dc.rights | Default Licence | - |
| dc.subject | microwave background dipole | en |
| dc.subject | quasar polarization vectors | en |
| dc.subject | probe wmap observations | en |
| dc.subject | cosmological constant | en |
| dc.subject | matter | en |
| dc.subject | anisotropy | en |
| dc.subject | galaxies | en |
| dc.subject | flow | en |
| dc.subject | satellites | en |
| dc.subject | inflation | en |
| dc.title | Generalized Lemaitre-Tolman-Bondi model with inhomogeneous isotropic dark energy: Observational constraints | en |
| heal.abstract | We consider on-center and off-center observers in an inhomogeneous, spherically symmetric, isocurvature (flat) concentration of dark energy with a typical size of a few Gpc. Such a concentration could be produced e. g. by a recently formed global monopole with core size that approaches the Hubble scale. In this case we would have what may be called "topological quintessence" in analogy with the well-known topological inflation. We show that the minimum comoving radius r(0) (min) of such a dark energy inhomogeneity that is consistent with the Union2 type Ia supernovae data at the 3 sigma level is r(0) (min) similar or equal to 1: 8 Gpc. As expected, the best-fit fractional dark energy density at the center, Omega(X,in), approaches the corresponding Lambda CDM value Omega(X,in) = 0.73 for large enough values of the inhomogeneity radius r0 (r(0) > 4 Gpc). Using the Union2 data, we show that the maximum allowed shift r(obs-max) of the observer from the center of the inhomogeneity is about 0.7 r(0), which respects the Copernican principle. The model naturally predicts the existence of a preferred axis and alignment of the low CMB multipoles. However, the constraints on r(obs-max) coming from the magnitude of the CMB dipole remain a severe challenge to the Copernican principle and lead to r(obs-max) < 110 Mpc, even for an inhomogeneity radius as large as r(0) = 7 Gpc. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | Doi 10.1103/Physrevd.84.023514 | - |
| heal.identifier.secondary | <Go to ISI>://000292693100002 | - |
| heal.identifier.secondary | http://prd.aps.org/abstract/PRD/v84/i2/e023514 | - |
| heal.journalName | Physical Review D | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2011 | - |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών | el |
| heal.type | journalArticle | - |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.type.en | Journal article | en |
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