Data di Pubblicazione:
2016
Citazione:
A note on generalized Robertson-Walker space-times / C.A. Mantica, Y. Jin Suh, U. Chand De. - In: INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS. - ISSN 0219-8878. - 13:6(2016 Jul), pp. 1650079.1-1650079.9. [10.1142/s0219887816500791]
Abstract:
A generalized Robertson-Walker (GRW) space-time is the generalization of the classical Robertson-Walker space-time. In the present paper, we show that a Ricci simple manifold with vanishing divergence of the conformal curvature tensor admits a proper concircular vector field and it is necessarily a GRW space-time. Further, we show that a stiff matter perfect fluid space-time or a mass-less scalar field with time-like gradient and with divergence-free Weyl tensor are GRW space-times.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Generalized Robertson-Walker space-time; Lorentzian manifolds with divergence free Weyl tensor; perfect fluid space-times; scalar field space-times with time-like gradient; time-like concircular vector field;
Elenco autori:
C.A. Mantica, Y. Jin Suh, U. Chand De
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