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arXiv 1808.01044gr-qc
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球对称de Sitter时空中非最小耦合标量场的动力学演化

Dynamical evolution of non-minimally coupled scalar field in spherically symmetric de Sitter spacetimes

R. D. B. Fontana, Jeferson de Oliveira, A. B. Pavan

摘要:

研究了渐近de Sitter时空几何中与爱因斯坦张量和Ricci标量非极小耦合的标量场的动力学行为。我们证明了,如果标量场是无质量的,黑洞是不带电的,准正规模不受影响。在有质量的情况下,两个参数的耦合在时空中产生一个由几何和场参数决定的不稳定区域。在Schwarzschild情况下,具有$\ell>0$的运动方程的每个解具有产生不稳定模式的耦合常数的值的范围。情况$\ell=0$是最不稳定的情况,具有耦合稳定性的阈值。对于带电黑洞,$η$中存在的一系列不稳定性与几何参数密切相关,该几何参数呈现出与所选参数无关的稳定区域。

英文摘要:

We investigate the dynamical behavior of a scalar field non-minimally coupled to Einstein's tensor and Ricci scalar in geometries of asymptotically de Sitter spacetimes. We show that the quasinormal modes remain unaffected if the scalar field is massless and the black hole is electrically chargeless. In the massive case, the coupling of both parameters produces a region of instability in the spacetime determined by the geometry and field parameters. In the Schwarzschild case, every solution for the equations of motion with $\ell>0$ has a range of values of the coupling constant that produces unstable modes. The case $\ell=0$ is the most unstable one, with a threshold value for stability in the coupling. For the charged black hole, the existence of a range of instability in $η$ is strongly related to geometry parameters presenting a region of stability independent of the chosen parameter.

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