The Boltzmann Brain problem – the multiverse's prediction that you are a randomly fluctuated brain with false memories – sounds like a ridiculous problem. In a sense, it is. But it's nevertheless a major challenge for the multiverse which claims we are typical observers. The Grand Universe problem – the sheer splendor and grandeur of our immense universe – likewise presents a significant question for the multiverse’s claim that our universe is typical. These problems cast serious doubt on the multiverse’s third premise – that we are typical observers in a typical universe with intelligent life.

Timestamps:

0:00 - Opening

2:08 - Summary of Last Two Episodes

4:30 - Boltzmann Brain Problem

8:58 - Why Does It Matter If You’re a Boltzmann Brain?

12:46 - The Grand Universe Problem

17:30 - A Historical Irony

20:28 - The Need for Justification

Get essay versions of all episodes in Season 1: Intelligent Cause and Season 2: Analyzing & Rejecting Multiverse

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Boltzmann Brain and Grand Universe Problems - S2:E8