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arXiv 1911.03213gr-qchep-th
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半经典引力中的史瓦西几何对应

Schwarzschild geometry counterpart in semiclassical gravity

Julio Arrechea, Carlos Barceló, Raúl Carballo-Rubio, Luis J. Garay

摘要:

研究了真空极化对真空静态球对称时空的影响。我们从Polyakov近似出发,讨论了最小耦合无质量标量场的重整化应力-能量张量。这个RSET在$r=0$上不是正则的,所以我们定义了Polyakov RSET的正则化版本。使用这个正则化RSET,并在前面的对称性假设下,我们找到了真空中半经典场方程的所有解。由此产生的史瓦西经典几何的对应物用虫洞喉代替了事件视界的存在,虫洞喉连接外部渐近平坦区域和内部渐近区域,内部渐近区域具有裸奇点:没有具有明确定义的柯西曲面的半经典真空解。我们还表明,正则化Polyakov RSET允许任意小的喉道半径的虫洞几何形状。这一分析为未来研究具有内部非真空区的恒星构型铺平了道路。

英文摘要:

We investigate the effects of vacuum polarization on vacuum static spherically-symmetric spacetimes. We start from the Polyakov approximation to the renormalized stress-energy tensor (RSET) of a minimally coupled massless scalar field. This RSET is not regular at $r=0$, so we define a regularized version of the Polyakov RSET. Using this Regularized RSET, and under the previous symmetry assumptions, we find all the solutions to the semiclassical field equations in vacuum. The resulting counterpart to the Schwarzschild classical geometry substitutes the presence of an event horizon by a wormhole throat that connects an external asymptotically flat region with an internal asymptotic region possessing a naked singularity: there are no semiclassical vacuum solutions with well-defined Cauchy surfaces. We also show that the Regularized Polyakov RSET allows for wormhole geometries of arbitrarily small throat radius. This analysis paves the way to future investigations of proper stellar configurations with an internal non-vacuum region.

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