Stable Isotropic Cosmological Singularities in Quadratic Gravity

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dc.creatorBarrow, John D.
dc.creatorMiddleton, Jonathan
dc.date2007-02-16
dc.date.accessioned2026-07-07T11:01:44Z
dc.date.available2026-07-07T11:01:44Z
dc.descriptionWe show that, in quadratic lagrangian theories of gravity, isotropic cosmological singularities are stable to the presence of small scalar, vector and tensor inhomogeneities. Unlike in general relativity, a particular exact isotropic solution is shown to be the stable attractor on approach to the initial cosmological singularity. This solution is also known to act as an attractor in Bianchi universes of types I, II and IX, and the results of this paper reinforce the hypothesis that small inhomogeneous and anisotropic perturbations of this attractor form part of the general cosmological solution to the field equations of quadratic gravity. Implications for the existence of a 'gravitational entropy' are also discussed.
dc.description18 pages, no figures
dc.identifierhttps://arxiv.org/abs/gr-qc/0702098
dc.identifierhttp://arxiv.org/abs/gr-qc/0702098
dc.identifierPhys.Rev.D75:123515,2007
dc.identifierdoi:10.1103/PhysRevD.75.123515
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/188038
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Theory
dc.titleStable Isotropic Cosmological Singularities in Quadratic Gravity
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