Crossing the phantom divide: theoretical implications and observational status
| dc.contributor.author | Nesseris, S. | en |
| dc.contributor.author | Perivolaropoulos, L. | en |
| dc.date.accessioned | 2015-11-24T18:31:04Z | |
| dc.date.available | 2015-11-24T18:31:04Z | |
| dc.identifier.issn | 1475-7516 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/16418 | |
| dc.rights | Default Licence | - |
| dc.subject | cmbr theory | en |
| dc.subject | dark energy theory | en |
| dc.subject | cosmology of theories beyond the sm | en |
| dc.subject | high-redshift supernovae | en |
| dc.subject | equation-of-state | en |
| dc.subject | microwave background anisotropies | en |
| dc.subject | hubble-space-telescope | en |
| dc.subject | digital sky survey | en |
| dc.subject | dark energy | en |
| dc.subject | cosmological constant | en |
| dc.subject | accelerating universe | en |
| dc.subject | extra dimensions | en |
| dc.subject | power spectrum | en |
| dc.title | Crossing the phantom divide: theoretical implications and observational status | en |
| heal.abstract | If the dark energy equation of state parameter w( z) crosses the phantom divide line w = - 1 ( or equivalently if the expression d(H(2)(z))/dz-3 Omega(0m)H(0)(2) ( 1 + z)(2) changes sign) at recent redshifts, then there are two possible cosmological implications. Either the dark energy consists of multiple components with at least one non-canonical phantom component or general relativity needs to be extended to a more general theory on cosmological scales. The former possibility requires the existence of a phantom component which has been shown to suffer from serious theoretical problems and instabilities. Therefore, the latter possibility is the simplest realistic theoretical framework in which such a crossing can be realized. After providing a pedagogical description of various dark energy observational probes, we use a set of such probes ( including the Gold SnIa ( supernovae type Ia) sample, the first-year SNLS ( Supernova Legacy Survey) data-set, the three-year WMAP CMB ( Wilkinson Microwave Anisotropy Probe cosmic microwave background) shift parameter, the SDSS (Sloan Digital Sky Survey) baryon acoustic oscillations peak (BAO), the x-ray gas mass fraction in clusters and the linear growth rate of perturbations at z = 0.15 as obtained from the 2dF (Two-Degree Field) Galaxy Redshift Survey) to investigate the priors required for cosmological observations to favour crossing of the phantom divide. We find that a low Omega(0m) prior ( 0.2 < Omega(0m) < 0.25) leads, for most observational probes ( except of the SNLS data), to an increased probability ( mild trend) for phantom divide crossing. An interesting degeneracy of the integrated Sachs-Wolfe effect in the CMB perturbation spectrum is also pointed out. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | Doi 10.1088/1475-7516/2007/01/018 | - |
| heal.identifier.secondary | <Go to ISI>://000244080700018 | - |
| heal.identifier.secondary | http://iopscience.iop.org/1475-7516/2007/01/018/pdf/1475-7516_2007_01_018.pdf | - |
| heal.journalName | Journal of Cosmology and Astroparticle Physics | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2007 | - |
| 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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