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arXiv 1111.3415gr-qchep-th
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具有非最小导数耦合的标量虫洞

Scalar wormholes with nonminimal derivative coupling

Sergey Sushkov, Roman Korolev

摘要:

我们考虑静态球对称虫洞配置的标量场的引力理论与潜在的$V(ϕ)$和非最小导数耦合的曲率描述的长期$(εg_{μν} + κG_{μν}) ϕ^{,μ}ϕ^{,ν}$的行动。我们表明,耀斑的条件提供了一个虫洞喉的几何形状可以满足如果$ε=-1$(幻影标量)和$ε=+1$(普通标量)。在附加可穿越性的条件下,我们构造了描述具有任意$κ$、$ε=-1$和$V(ϕ)=0$(无势)的模型中可穿越虫洞的数值解.可穿越性假设虫洞有两个渐近平坦的区域,并具有相应的史瓦西质量。我们发现,渐近质量的虫洞与非最小的导数耦合可以是积极的和/或消极的依赖于$κ$。特别地,只有在$κ<κ_1\le0$的情况下,两个质量都是正的,否则一个或两个虫洞质量都是负的。最后,我们给出了具有正质量的虫孔位形可能是稳定的定性论据。

英文摘要:

We consider static spherically symmetric wormhole configurations in a gravitational theory of a scalar field with a potential $V(ϕ)$ and nonminimal derivative coupling to the curvature describing by the term $(εg_{μν} + κG_{μν}) ϕ^{,μ}ϕ^{,ν}$ in the action. We show that the flare-out conditions providing the geometry of a wormhole throat could fulfilled both if $ε=-1$ (phantom scalar) and $ε=+1$ (ordinary scalar). Supposing additionally a traversability, we construct numerical solutions describing traversable wormholes in the model with arbitrary $κ$, $ε=-1$ and $V(ϕ)=0$ (no potential). The traversability assumes that the wormhole possesses two asymptotically flat regions with corresponding Schwarzschild masses. We find that asymptotical masses of a wormhole with nonminimal derivative coupling could be positive and/or negative depending on $κ$. In particular, both masses are positive only provided $κ<κ_1\le0$, otherwise one or both wormhole masses are negative. In conclusion, we give qualitative arguments that a wormhole configuration with positive masses could be stable.

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