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Further Exact Cosmological Solutions to Higher-Order Gravity Theories

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arxiv gr-qc/0601118 v1 pith:Z634JKHF submitted 2006-01-27 gr-qc astro-phhep-ph

T. Clifton , John D. Barrow This is my paper · ORCID
classification gr-qcastro-phhep-ph
keywords solutionscosmologicalexactgeneralgravityrelativitytheoriesanisotropic
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We investigate the effect of deviations from general relativity on approach to the initial singularity by finding exact cosmological solutions to a wide class of fourth-order gravity theories. We present new anisotropic vacuum solutions of modified Kasner type and demonstrate the extent to which they are valid in the presence of non-comoving perfect-fluid matter fields. The infinite series of Mixmaster oscillations seen in general relativity will not occur in these solutions, except in unphysical cases.

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  1. Black hole interiors in the thermal view of scalar-tensor gravity

    gr-qc 2025-05 conditional novelty 4.0 of 10

    In the thermal view of Brans-Dicke gravity, black hole singularities are 'hot': the effective temperature KT diverges as 1/t, and a fluid with P=wρ controls whether gravity approaches or departs from general relativity.

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