标题： 超低质量粒子的真空效应解释了宇宙的近期加速膨胀 显示英文标题

标题： Vacuum effects of ultra-low mass particle account for Recent Acceleration of Universe

摘要： 在最近的工作中，我们表明，一种非常低质量粒子的非微扰真空效应可以在红移约为1时，引发从物质主导宇宙到加速膨胀宇宙的转变。 在那项工作中，我们采用了物质主导阶段突然转变的简化模型，并能够用一个空间开放的宇宙拟合I型超新星（SNe-Ia）数据点。 在目前的工作中，我们找到了量子修正爱因斯坦方程的一个更精确、平滑的 {\it 空间平坦的} 解析解。 这个解在粒子质量参数 $m_h$ 的范围为 $6.40 \times 10^{-33}$ 电子伏特到 $7.25 \times 10^{-33}$ 电子伏特时，能够很好地拟合SNe-Ia数据。 因此，总物质密度（包括暗物质）与临界密度的比值，$\O_0$，在0.58到0.15之间，宇宙的年龄$t_0$在$8.10 h^{-1}$Gyr到$12.2 h^{-1}$Gyr之间，其中$h$是哈勃常数的当前值，以100 km/(s Mpc)的分数形式测量。 这个空间平坦的模型与宇宙背景辐射在小角度尺度波动中的第一个声学峰位置的估计相符，并且与标准大爆炸核合成的轻元素丰度相符。 我们的模型只有一个自由参数，$m_h$，并不要求我们生活在宇宙演化中的一个特殊时期。 显示英文摘要

摘要： In recent work, we showed that non-perturbative vacuum effects of a very low mass particle could induce, at a redshift of order 1, a transition from a matter-dominated to an accelerating universe. In that work, we used the simplification of a sudden transition out of the matter-dominated stage and were able to fit the Type Ia supernovae (SNe-Ia) data points with a spatially-open universe. In the present work, we find a more accurate, smooth {\it spatially-flat} analytic solution to the quantum-corrected Einstein equations. This solution gives a good fit to the SNe-Ia data with a particle mass parameter $m_h$ in the range $6.40 \times 10^{-33}$ eV to $7.25 \times 10^{-33}$ eV. It follows that the ratio of total matter density (including dark matter) to critical density, $\O_0$, is in the range 0.58 to 0.15, and the age $t_0$ of the universe is in the range $8.10 h^{-1}$ Gyr to $12.2 h^{-1}$ Gyr, where $h$ is the present value of the Hubble constant, measured as a fraction of the value 100 km/(s Mpc). This spatially-flat model agrees with estimates of the position of the first acoustic peak in the small angular scale fluctuations of the cosmic background radiation, and with light-element abundances of standard big-bang nucleosynthesis. Our model has only a single free parameter, $m_h$, and does not require that we live at a special time in the evolution of the universe.