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arXiv 1301.6785astro-ph.COgr-qc
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星系转动曲线的暗物质状态方程

Dark matter equation of state from rotational curves of galaxies

Juan Barranco, Argelia Bernal, Dario Nunez

摘要:

在这项工作中,我们模拟的星系晕描述的暗物质作为一个非零压力流体,并推导出,而不是强加,暗物质状态方程,利用观测数据的旋转曲线的星系。为了达到流体静力平衡,正如对晕的预期,暗流体的压力不应该为零是强制性的。状态方程是通过求解假设不同的暗物质密度或旋转速度分布的物质几何方程组得到的。一般来说,所得到的状态方程不同于正压状态方程。通过拟合观测到的一组星系的自转速度来确定状态方程的自由参数。

英文摘要:

In this work we model galactic halos describing the dark matter as a non zero pressure fluid and derive, not impose, a dark matter equation of state by using observational data of the rotation curves of galaxies. In order to reach hydrostatic equilibrium, as expected for the halo, it is mandatory that dark fluid's pressure should not be zero. The equation of state is obtained by solving the matter-geometry system of equations assuming different dark matter density or rotational velocity profiles. The resulting equations of state are, in general, different to a barotropic equation of state. The free parameters of the equation of state are fixed by fitting the observed rotational velocities of a set of galaxies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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