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.
Further Exact Cosmological Solutions to Higher-Order Gravity Theories
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abstract
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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Black hole interiors in the thermal view of scalar-tensor gravity
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.