A Weyl-geometry vector field yields a four-dimensional generalized-Proca Gauss-Bonnet theory whose black holes carry two independent primary-hair constants, one of which becomes an effective cosmological constant after a disformal transformation.
Randall-Sundrum versus holographic cosmology
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abstract
We consider a model of a holographic braneworld universe in which a cosmological fluid occupies a 3+1 dimensional brane located at the boundary of the asymptotic AdS$_5$ bulk. We combine the AdS/CFT correspondence and the second Randall-Sundrum (RSII) model to establish a relationship between the RSII braneworld cosmology and the boundary metric induced by the time dependent bulk geometry. In the framework of the Friedmann Robertson Walker cosmology we discuss some physically interesting scenarios involving the RSII and holographic braneworlds.
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Proca theory of four-dimensional regularized Gauss-Bonnet gravity and black holes with primary hair
A Weyl-geometry vector field yields a four-dimensional generalized-Proca Gauss-Bonnet theory whose black holes carry two independent primary-hair constants, one of which becomes an effective cosmological constant after a disformal transformation.