Asymmetric Wormholes via Electrically Charged Lightlike Branes
Eduardo Guendelman, Alexander Kaganovich, Emil Nissimov, Svetlana Pacheva
备注：
17 pages, to appear in the proceedings "Lie Theory and Its Applications in Physics 08" (Varna, June 2009), eds. V. Dobrev and H. Doebner (Heron Press, Sofia, 2010)
We consider a self-consistent Einstein-Maxwell-Kalb-Ramond system in the bulk D=4 space-time interacting with a variable-tension electrically charged lightlike brane. The latter serves both as a material and charge source for gravity and electromagnetism, as well as it dynamically generates a bulk space varying cosmological constant. We find an asymmetric wormhole solution describing two "universes" with different spherically symmetric black-hole-type geometries connected through a "throat" occupied by the lightlike brane. The electrically neutral "left universe" comprises the exterior region of Schwarzschild-de-Sitter (or pure Schwarzschild) space-time above the inner (Schwarzschild-type) horizon, whereas the electrically charged "right universe" consists of the exterior Reissner-Nordstroem (or Reissner-Nordstroem-de-Sitter) black hole region beyond the outer Reissner-Nordstroem horizon. All physical parameters of the wormhole are uniquely determined by two free parameters - the electric charge and Kalb-Ramond coupling of the lightlike brane.
Hiding and Confining Charges via "Tube-like" Wormholes
我们描述了虫洞物理中两个有趣的效应。首先，我们发现，一个真正带电的物质源可能会出现中性的外部观察者-一个现象相反的著名的米斯纳-惠勒“不带电荷的电荷”的效果。这种现象发生在耦合体重力/非线性规范场系统到带电的类光膜作为物质源时。“电荷隐藏”效应发生在一个连接一个非紧凑的“宇宙”的虫洞解决方案，包括外部区域的史瓦西-（反）de-Sitter（SdS）或纯粹的史瓦西黑洞超越史瓦西视界，一个列维-奇维塔-贝尔托蒂-罗宾逊型（LCBR）“管状”的”宇宙”通过虫洞“喉”占领膜。在这种解决方案中，膜产生的全部电通量被排入“管状”“宇宙”，而膜在非紧凑“宇宙”中被观察者检测为中性。接下来，我们发现一个真正的电荷限制虫洞的解决方案时，我们耦合的散装重力/非线性规范场系统的两个相反的充电类光膜。后一个系统具有“双喉道”虫洞解，其中“最左边”和“最右边”的“宇宙”是超越史瓦西视界的SdS黑洞外部区域的两个相同副本，而“中间”的“宇宙”是LCBR“管状”形式，几何形状为dS_2 x S^2。它包括dS_2的两个视界之间的有限范围的中间区域。两个“咽喉”都被两个带相反电荷的类光膜占据，而后者产生的全部电通量完全被限制在中间的“管状”“宇宙”中。一个关键的因素是非线性规范场作用量的特殊形式，它既包含标准麦克斯韦项，也包含后者的平方根。这个理论先前被证明在平坦时空中产生类似QCD的约束动力学。
