Ciro Santilli
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Physics is the art of predicting the future by modelling the world with mathematics.
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Ciro Santilli doesn't know physics. He writes about it partly to start playing with some scientific content for: Write free books to get famous website, partly because this stuff is just amazingly beautiful.
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Ciro's main intellectual physics fetishes are to learn quantum electrodynamics (understanding the point of Lie groups being a subpart of that) and condensed matter physics.
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Every science is Physics in disguise, but the number of objects in the real world is so large that we can't solve the real equations in practice.
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Luckily, due to emergence, we can use uglier higher level approximations of the world to solve many problems, with the complex limits of applicability of those approximations.
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Therefore, such higher level approximations are highly specialized, and given different names such as:
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As of 2019, all known physics can be described by two theories:
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Unifying those two into the theory of everything one of the major goals of modern physics.
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Figure 43. xkcd 435: Fields arranged by purity. Source.
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Ancestors

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