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Relativistic star solutions in higher-dimensional pseudospheroidal space-time

机译:高维拟球面时空的相对论星解

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We obtain relativistic solutions of a class of compact stars in hydrostatic equilibrium in higher dimensions by assuming a pseudospheroidal geometry for the space-time. The space-time geometry is assumed to be (e??· - 1) pseudospheroid immersed in a e??·-dimensional Euclidean space. The spheroidicity parameter (e???) plays an important role in determining the equation of state of the matter content and the maximum radius of such stars. It is found that the core density of compact objects is approximately proportional to the square of the space-time dimensions (e??·), i.e., core of the star is denser in higher dimensions than that in conventional four dimensions. The central density of a compact star is also found to depend on the parameter e???. One obtains a physically interesting solution satisfying the acoustic condition when e??? lies in the range e??? (e??· + 1)/(e??· a?’ 3) for the space-time dimensions ranging from e??· = 4 to 8 and (e??· + 1)/(e??· a?’ 3) e??? (e??·2 - 4e??· + 3)/(e??·2 - 8e??· - 1) for space-time dimensions a‰¥ 9. The non-negativity of the energy density (e???) constrains the parameter with a lower limit ( 1). We note that in the case of a superdense compact object the number of space-time dimensions cannot be taken infinitely large, which is a different result from the braneworld model.
机译:通过假设时空为假球体几何形状,我们可以在更高的静压平衡中获得一类紧致恒星的相对论解。假定时空的几何形状是浸在eθ·维欧几里得空间中的(eθ·-1)拟球体。球度参数(e ???)在确定物质含量的状态方程和此类恒星的最大半径方面起着重要作用。可以发现,致密物体的芯密度大约与时空尺寸的平方成正比(e25·),即,与传统的四个尺寸相比,恒星的芯在更高的尺寸上密度更高。还发现密实恒星的中心密度取决于参数e -1。当e≤1时,人们获得了满足声学条件的有趣的物理解决方案。位于范围e ??? >(e ??·+ 1)/(e ??·a?'3)的时空维数范围从e ??·= 4到8和(e ??·+ 1)/(e ?? ·a?'3) 1)。我们注意到,在一个超致密的物体的情况下,时空维度的数量不能无限大,这与braneworld模型的结果不同。

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