Evading Derrick's theorem in curved space: Static metastable spherical domain wall

Abstract

A recent analysis by one of the authors\cite{Perivolaropoulos:2018cgr} has pointed out that Derrick's theorem can be evaded in curved space. Here we extend that analysis by demonstrating the existence of a static metastable solution in a wide class of metrics that include a Schwarzschild-Rindler-AntideSitter spacetime (Grumiller metric) defined as $d{s}^2=f(r)d{t}^2-f(r{)}^{-1}d{r}^2-r^2(d{\theta }^2+{\sin }^2\theta d{\varphi }^2)$ with $f(r)=1-\frac{2Gm}{r}+2br-\frac{\Lambda }{3}{r}^2$ ($\Lambda <0b<0$). This metric emerges generically as a spherically symmetric vacuum solution in a class of scalar-tensor theories\cite{Grumiller:2010bz} as well as in Weyl conformal gravity\cite{Mannheim:1988dj}. It also emerges in General Relativity (GR) in the presence of a cosmological constant and a proper spherically symmetric perfect fluid. We demonstrate that this metric supports a static spherically symmetric metastable soliton scalar field solution that corresponds to a spherical domain wall. We derive the static solution numerically and identify a range of parameters $m,b,\Lambda$ of the metric for which the spherical wall is metastable. Our result is supported by both a minimization of the scalar field energy functional with proper boundary conditions and by a numerical simulation of the scalar field evolution. The metastable solution is very well approximated as $\varphi (r)=Tanh\left[q(r-r_0)\right]$ where $r_0$ is the radius of the metastable wall that depends on the parameters of the metric and $q$ determines the width of the wall. We also find the gravitational effects of the thin spherical wall solution and its backreaction on the background metric that allows its formation. We show that this backreaction does not hinder the metastability of the solution even though it can change the range of parameters that correspond to metastability.

arXiv comment11 pages, 8 Figures. The Mathematica files that lead to the production of the Figures are publicly available at http://leandros.physics.uoi.gr/newsolgr/

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• Gravitational transitions via the explicitly broken symmetron screening mechanism
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• Reconstructing a Model for Gravity at Large Distances from Dark Matter Density Profiles
• Scalar fields and Lifshitz black holes from Derrick's theorem evasion
• Impurity-doped stable domain walls in spherically symmetric spacetimes
• Impurity-doped scalar fields in arbitrary dimensions
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• Probing dark fluids and modified gravity with gravitational lensing
• Compact stars in Einstein-scalar-Gauss-Bonnet gravity: regular and divergent scalar field configurations
• Effective Lifshitz black holes, hydrodynamics, and transport coefficients in fluid/gravity correspondence