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第351章 多元宇宙(1 / 2)

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时间又过了一天,张晓辰开始探究第四层平行宇宙是什么样的。

他的脑海里有个声音在慢慢解说,我们应用、检验和排除理论的方法,就是用我们过去的经验来计算未来事件的概率分布,并把这些预言和观测结果相比较。

在多元宇宙论中,一般而言,不只有一个SAS和你经历了过去同样的生活,所以不能确定哪一个才是你。因此,为了做出预言,你必须计算他们中多大比例的人能够预见未来,这就导致了下面几个预言:

预言1:描述我们世界的数学结构是与我们的观测一致的数学结构中最普遍的一种。

预言2:我们未来的观测是与过去的观测一致的最普遍的观测。

预言3:我们过去的观测是与我们的存在一致的最普遍的观测。

数学结构有一个令人惊异的特性,那就是对称性和不变性是普遍的,而正是它们造就了宇宙的简单和有序。它们更像是常规而不是例外,数学结构倾向于自动具有这些性质,而为了除去它们,必须增加复杂的公理等。换句话说,正因为这一点和选择效应,第四层平行宇宙中的生命不再是一团混乱。

其还存在部分理论争议。

针对平行宇宙的主要争论在于,它们很浪漫并且很离奇,来依次考虑这两点。首先,平行宇宙理论很容易被奥卡姆剃刀原理所攻击,因为它们假设了其他宇宙存在,而人们却永远观测不到。为何自然在本体上如此浪费,并沉溺于这些多到无穷无尽的不同世界,但这一点也可以反过来支持平行宇宙。

当人们觉得自然过于浪费时,人们到底是在困惑关于它浪费的哪一点,显然不是“空间”,因为标准的平坦宇宙模型中无限的体积并没有引起这样的反对。也不是“物质”或“原子”——理由相同,一旦已经浪费了无限的东西,谁在乎再浪费多点呢。所以,这种令人困惑的“浪费”倒不如说是一种简化,它减少了说明所有这些不可见世界所需的信息量。

然而,正如泰马克详细讨论过的那样,整个集合往往要比集合中的单个元素简单得多。例如,一个普通整数n的算法信息内容在量级上,这就是将它用二进制写出来所需要的比特数。然而,所有整数的集合,1、2、3、…,只需要寥寥几行计算机程序就能生成,所以整个集合的算法复杂度要远小于其中某个整数。

同样,爱因斯坦引力场方程的全部理想流体解的集合,算法复杂度要远低于其中某个特解,因为前者只需要很少几个方程就能描述,而后者要求在某个超曲面指定大量的初始数据。不严格地说,当人们把注意力局限在一个集合中的某个特定元素上时,表观信息的内容增加了,却失去了将所有元素考虑进来时整个系统内在的对称性和简单些。

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