Abstract
We analyze in detail the geometry and dynamics of the cosmological region arising in spherically symmetric black hole solutions of the Einstein–Maxwell-scalar field system with a positive cosmological constant. More precisely, we solve, for such a system, a characteristic initial value problem with data emulating a dynamic cosmological horizon. Our assumptions are fairly weak, in that we only assume that the data approach that of a subextremal Reissner–Nordström-de Sitter black hole, without imposing any rate of decay. We then show that the radius (of symmetry) blows up along any null ray parallel to the cosmological horizon (“near” \(i^+\)), in such a way that \(r=+\infty \) is, in an appropriate sense, a spacelike hypersurface. We also prove a version of the cosmic no-hair conjecture by showing that in the past of any causal curve reaching infinity both the metric and the Riemann curvature tensor asymptote to those of a de Sitter spacetime. Finally, we discuss conditions under which all the previous results can be globalized.
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Notes
See point 4 of Theorem 1.1 for the formulation used here.
See below the clarification of this terminology.
To set the convention, whenever we refer to an RNdS solution \(({{\mathcal {M}}}, g)\) we mean the maximal domain of dependence \(D(\Sigma ) = {{\mathcal {M}}}\) of a complete Cauchy hypersurface \(\Sigma = \mathbb {R}\times \mathbb {S}^2\).
These stability results concern the Einstein vacuum and Einstein–Maxwell equations, and not the Einstein–Maxwell-scalar field system.
Note that \((1-\mu )\) depends on (u, v) only through \((r,\varpi )\). In what follows, in a slight abuse of notation, we will interchangeably regard \((1-\mu )\) as a function of either pair of variables, with the meaning being clear from the context.
Non-degenerate in the terminology of [4].
From now on, all topological statements will refer to the topology of \([0,+\infty [ \times \left[ 0,V\right] \) induced by the standard topology of \(\mathbb {R}^2\).
There is a difference in a factor of \(4\pi \) due to our different convention for the value of Newton’s gravitational constant.
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Acknowledgements
We thank Anne Franzen for sharing and allowing us to use Fig. 1. This work was partially supported by FCT/Portugal through UID/MAT/04459/2013 and Grant (GPSEinstein) PTDC/MAT-ANA/1275/2014. Pedro Oliveira was supported by FCT/Portugal through the LisMath scholarship PD/BD/52640/2014.
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Communicated by Mihalis Dafermos.
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Costa, J.L., Natário, J. & Oliveira, P. Cosmic No-Hair in Spherically Symmetric Black Hole Spacetimes. Ann. Henri Poincaré 20, 3059–3090 (2019). https://doi.org/10.1007/s00023-019-00825-z
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DOI: https://doi.org/10.1007/s00023-019-00825-z