open_problems
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| - | {{indexmenu_n>8}} | + | {{indexmenu_n>10}} |
| + | ~~NOTOC~~ | ||
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| ====== Open Problems ====== | ====== Open Problems ====== | ||
| - | <nspages open_problems -h1 -textPages=""> | + | <WRAP group> |
| + | <WRAP half column> | ||
| + | Our present understanding of nature is far from complete. | ||
| - | **See also:** | + | Real problems are things related to **unexplained observed phenomena**, like dark matter or dark energy. |
| + | In addition, there are things that we can describe but do not understand. These are not really problems but rather **[[http://jakobschwichtenberg.com/problems-vs-puzzles/|puzzles]]**. Examples are the [[open_problems:flavour_puzzle|still not understood masses and mixing angles]] of the elementary particles or also the [[open_problems:hierarchy_puzzle|hierarchy puzzle]] and the question why strong interactions [[open_problems:strong_cp_puzzle|do not violate]] [[advanced_notions:cp_symmetry|CP symmetry]]. | ||
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| + | </WRAP> | ||
| + | <WRAP half column><nspages open_problems -h1 -textPages=""></WRAP> | ||
| + | </WRAP> | ||
| + | |||
| + | ---- | ||
| + | |||
| + | **The 5 Great Problems** | ||
| + | |||
| + | - __The problem of quantum gravity.__ This is the problem of combining general relativity and quantum theory into one theory. Such a theory would be able to describe all known interactions of nature. | ||
| + | - __The problem of quantum theories.__ This is the problem of understanding quantum such that it makes sense and solve its fundamental problems. | ||
| + | - __The unification of the particles and forces.__ Still no theory exists that unifies all known particles and interactions into a single fundamental entity. | ||
| + | - __Explain the constants of nature.__ The standard model of particle physics has 20+ free parameters that need to be inferred from experiments. It is an open problem to understand how these values are "chosen" by nature. | ||
| + | - __Explain dark matter and dark energy.__ If they really exists, as suggested by experiments, we need to understand what they consists of. In addition, the constants of the standard model of cosmology need the be explained. | ||
| + | |||
| + | For more information, see the chapter "The Five Great Problems in Theoretical Physics" in the book "Time Reborn" by Lee Smolin. | ||
| + | |||
| + | ===== Lists of Open Problems ===== | ||
| + | |||
| + | |||
| + | * [[https://arxiv.org/abs/1804.08730|Life, the universe, and everything - 42 fundamental questions]] by Roland E. Allen, Suzy Lidström | ||
| * http://math.ucr.edu/home/baez/physics/General/open_questions.html | * http://math.ucr.edu/home/baez/physics/General/open_questions.html | ||
| + | * https://en.wikipedia.org/wiki/List_of_unsolved_problems_in_physics | ||
| * Chiral Fermions, see https://arxiv.org/pdf/hep-th/0102028.pdf | * Chiral Fermions, see https://arxiv.org/pdf/hep-th/0102028.pdf | ||
| + | ---- | ||
| + | |||
| + | ===== Quotes ===== | ||
| + | |||
| <blockquote>The laws of physics seem to be composed out of five | <blockquote>The laws of physics seem to be composed out of five | ||
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| <cite>Colloquium: Photons and electrons as emergent phenomena Michael Levin and Xiao-Gang Wen https://journals.aps.org/rmp/pdf/10.1103/RevModPhys.77.871</cite></blockquote> | <cite>Colloquium: Photons and electrons as emergent phenomena Michael Levin and Xiao-Gang Wen https://journals.aps.org/rmp/pdf/10.1103/RevModPhys.77.871</cite></blockquote> | ||
| + | ---- | ||
open_problems.1509448235.txt.gz · Last modified: 2017/12/04 08:01 (external edit)
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