主题：【摘译】最新提出的轮回宇宙模型或能解决宇宙常数的难题 -- 衲子
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家园 <<Nature>>2006年5月4日关于此理论的新闻报道 对于宇宙常数的理论计算与实验观测的巨大差异,流行的解释是"人择原理", 可是这不合乎物理学家的口味(岂不是可以将不能解释的东西都推给"人择原理"? 再说,宇宙常数的人择原理也还有其不易解释的难题).
The cyclic universe gets around this problem, say Steinhardt and Turok. With cycles of growth and collapse taking a trillion years or so, and no limit to how many such cycles have preceded ours, there is plenty of time for the vacuum energy to have decayed almost to zero. And each cycle would concentrate matter during the collapse phase, making sure that the Universe doesn't end up empty.