标题： 收缩的膜世界：球状星团中的黑洞 显示英文标题

标题： Shrinking the Braneworld: Black Hole in a Globular Cluster

摘要： 大额外维度被提出作为解决物理学中层次问题的一种可能方案。 其中一个建议的模型，RS2膜宇宙模型，预测黑洞通过霍金辐射在短时间内蒸发，该时间尺度取决于黑洞质量和额外维度的渐近曲率半径。 因此，额外维度的大小可以通过天体物理观测进行约束。 在这里，我们指出，在星系NGC 4472中的球状星团中最近发现的黑洞，对额外维度的最大尺寸L < 0.003毫米提供了最强的约束。 这个黑洞具有年龄较大和相对较小质量的优点。 得出的上限与天体物理观测提供的黑洞绝对限制在一个数量级之内。 显示英文摘要

摘要： Large extra dimensions have been proposed as a possible solution to the hierarchy problem in physics. One of the suggested models, the RS2 braneworld model, makes a prediction that black holes evaporate by Hawking radiation on a short timescale that depends on the black hole mass and on the asymptotic radius of curvature of the extra dimensions. Thus the size of the extra dimensions can be constrained by astrophysical observations. Here we point out that the black hole, recently discovered in a globular cluster in galaxy NGC 4472, places the strongest constraint on the maximum size of the extra dimensions, L < 0.003 mm. This black hole has the virtues of old age and relatively small mass. The derived upper limit is within an order of magnitude of the absolute limit afforded by astrophysical observations of black holes.