The solution of the cosmological constant problem from the inhomogeneous equation of state - a hint from modified gravity?

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dc.creatorStefancic, Hrvoje
dc.date2008-07-23
dc.date2008-11-10
dc.date.accessioned2026-07-07T12:30:13Z
dc.date.available2026-07-07T12:30:13Z
dc.descriptionThe cosmological constant problem is studied in a two component cosmological model. The universe contains a cosmological constant of an arbitrary size and sign and an additional component with an inhomogeneous equation of state. It is shown that, in a proper parameter regime, the expansion of the universe with a large absolute value of the cosmological constant may asymptotically tend to de Sitter space corresponding to a small effective positive cosmological constant. It is argued that such a behavior can be regarded as a solution of the cosmological constant problem in this model. The mechanism behind the relaxation of the cosmological constant is discussed. A connection with modified gravity theories is discussed and an example of a possible realization of the cosmological constant relaxation in f(R) modified gravity is described.
dc.description18 pages, 8 figures, version to appear in Phys. Lett. B
dc.identifierhttps://arxiv.org/abs/0807.3692
dc.identifierhttp://arxiv.org/abs/0807.3692
dc.identifierPhys.Lett.B670:246-253,2009
dc.identifierdoi:10.1016/j.physletb.2008.10.065
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/216068
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleThe solution of the cosmological constant problem from the inhomogeneous equation of state - a hint from modified gravity?
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