Posted by Beast Rabban
Max Tegmark is in the British science magazine New Scientist this week (the week of the 15th of September), once again arguing for a multiverse. In the article ‘Reality by Numbers’ he argues that the universe is a mathematical object, like the dodecahedron of the Pythagoreans. An exploration of this possibility will not only give us an ultimate Theory of Everything, but also include parallel worlds and allow us to know this one in far greater depth than was previously conceivable. Basically, it’s another attempt at supporting atheist pantheism, arguing that the universe must also be eternal, impersonal, and, although he doesn’t mention this, without a creator.
The argument runs thus: Scientists and philosophers from Pythagoras to Eugene Wigner have noticed the uncanny ability of mathematics to describe and predict the universe. If reality is independent of humans, then it must also be defined by entities that lack human concepts. However, mathematics describes the universe abstractly without human conceptual notions like ‘stars’, ‘protons’ and so on. So, he concludes, ‘if you believe in an external reality independent of humans, then you must also believe in what I call the mathematical universe hypothesis: that our physical reality is a mathematical structure’. 1
The article then proceeds to investigate what this would mean, using the analogy of the world perceived by a frog fixed on the ground and bird flying above it. The physicist is the bird studying the universe’s mathematical structure from above, while the frog is the observer within the structure. A mathematical structure is abstract, outside of space and time, and immutable, so the bird would see a tangled spaghetti of world-lines according to relativistic perceptions of the world, while the frog sees the uncomplicated view of Newtonian physics. However, the observer would also be a tangled sphaghetti itself: ‘the frog must consist of a thick bundle of pasta whose structure corresponds to particles that store and process information in a way that gives rise to the familiar sensation of the universe’. 2
It then goes on to state that this view of reality is validated by the progress of science in discovering mathematical regularities in nature, such as the Standard Model of particle physics. The amount of information required to describe our particular frog’s eye view of the universe would is extremely large 10 to the power of 100 bits. 3 Most physicists hope for a Theory of Everything that will be far simpler. If so, the argument runs, then it would describe a multiverse, as if it lacks enough information to describe our reality, then it must be a general description of all possible realities. These universes are compulsory: they aren’t created, they just exist, as ‘the point is not that a mathematical structure describes the universe, but that it is a universe’. 4 Tegmark feels that this would answer John Wheeler’s question of why the particular equations that describe the universe do so, and not others. The answer is that there are other equations governing other universes.
Recognising that for this to be a scientific theory, rather than metaphysical speculation, it has to make predictions, the article argues that it could be falsified if it is found that the mathematical distribution predicted of parallel universes means we don’t exist in a typical universe.
It then goes on to argue that we should believe in the universe as a mathematical construct as it is counterintuitive. According to Darwin, human minds did not evolve to discover the truth, only to give the cognitive advantages necessary for survival. Quantum physics is true, but is counterintuitive and disturbing, therefore there is a warrant for believing that the universe is a mathematical structure, as this is similarly counterintuitive and disturbing. Continue reading ‘Cosmic Fantasies by Numbers’
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