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arXiv 0712.3602astro-ph
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用星系团检验幂律宇宙学

Testing power-law cosmology with galaxy clusters

Zong-Hong Zhu, Ming Hu, J. S. Alcaniz, Yu-Xing Liu

摘要:

幂律宇宙学,其中宇宙学尺度因子在年龄中以幂律演化,$a \propto t^α$与$α\ga 1$,不管物质含量或宇宙学时代如何,都与大量的宇宙学观测相一致。{In本文利用最近对星系团中X射线气体质量分数的测量结果,用曲率$k = \pm1, 0$来约束$α$参数。我们发现,最好的拟合发生在一个开放的场景与权力指数$α= 1.14 \pm 0.05$,虽然平面和封闭的模型不能排除在非常高的置信水平。{Our结果与最近的其他分析一致,并表明星系团中的X射线气体质量分数测量为幂律宇宙学提供了补充测试。

英文摘要:

Power-law cosmologies, in which the cosmological scale factor evolves as a power law in the age, $a \propto t^α$ with $α\ga 1$, regardless of the matter content or cosmological epoch, is comfortably concordant with a host of cosmological observations.} {In this article, we use recent measurements of the X-ray gas mass fractions in clusters of galaxies to constrain the $α$ parameter with curvature $k = \pm1, 0$. We find that the best fit happens for an open scenario with the power index $α= 1.14 \pm 0.05$, though the flat and closed model can not be rule out at very high confidence level.} {Our results are in agreement with other recent analyses and show that the X-ray gas mass fraction measurements in clusters of galaxies provide a complementary test to the power law cosmology.

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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