Can f(R) modified gravity theories mimic a Lambda CDM cosmology?
| dc.contributor.author | Fay, S. | en |
| dc.contributor.author | Nesseris, S. | en |
| dc.contributor.author | Perivolaropoulos, L. | en |
| dc.date.accessioned | 2015-11-24T17:58:08Z | |
| dc.date.available | 2015-11-24T17:58:08Z | |
| dc.identifier.issn | 1550-7998 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/15830 | |
| dc.rights | Default Licence | - |
| dc.subject | holographic dark energy | en |
| dc.subject | high-redshift supernovae | en |
| dc.subject | scalar-tensor theory | en |
| dc.subject | equation-of-state | en |
| dc.subject | accelerating universe | en |
| dc.subject | cosmic acceleration | en |
| dc.subject | inverse powers | en |
| dc.subject | constant | en |
| dc.subject | model | en |
| dc.subject | field | en |
| dc.title | Can f(R) modified gravity theories mimic a Lambda CDM cosmology? | en |
| heal.abstract | We consider f(R) modified gravity theories in the metric variation formalism and attempt to reconstruct the function f(R) by demanding a background Lambda CDM cosmology. In particular we impose the following requirements: (a) A background cosmic history H(z) provided by the usual flat Lambda CDM parametrization though the radiation (w(eff)=1/3), matter (w(eff)=0), and de Sitter (w(eff)=-1) eras. (b) Matter and radiation dominate during the "matter" and "radiation" eras, respectively, i.e. Omega(m)=1 when w(eff)=0 and Omega(r)=1 when w(eff)=1/3. We have found that the cosmological dynamical system constrained to obey the Lambda CDM cosmic history has four critical points in each era which correspondingly lead to four forms of f(R). One of them is the usual general relativistic form f(R)=R-2 Lambda. The other three forms in each era, reproduce the Lambda CDM cosmic history but they do not satisfy requirement (b) stated above. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.secondary | <Go to ISI>://000249786900025 | - |
| heal.identifier.secondary | http://prd.aps.org/abstract/PRD/v76/i6/e063504 | - |
| heal.journalName | Physical Review D | 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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