Data di Pubblicazione:
2008
Citazione:
Isotropic inhomogeneous cosmological model
with torsion / A. Zecca. - In: ADVANCED STUDIES IN THEORETICAL PHYSICS. - ISSN 1313-1311. - 2:16(2008), pp. 751-760.
Abstract:
An isotropic, inhomogeneous cosmology with torsion and cosmological constant is considered in the context of the Lemaitre-Tolman-Bondi metric. The form of the torsion tensor isdetermined from the isotropy of space. The field equations are derived by varying the Einstein-Cartan-Hilbert action with respect to the metric tensor and considering the torsion as a parameter. Consistency
of the field equation implies that only the axial part of the torsion is of relevance and that torsion differs from pression by an
arbitrary time dependent function. If such function is taken constant, the scheme admits inflationary phases, but torsion is irrelevant because it amounts to a
re-definition of the cosmological constant. On the contrary, if that function is not constant, the scheme is much more difficult to be integrate, but torsion results to be an effective suitable parameter to fit observational data.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Inflation; Inhomogeneous isotropic Universe; Lemaître-Tolman-Bondi model; Torsion
Elenco autori:
A. Zecca
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