The 4 Greatest Mysteries of Physics

There are still some great mysteries of our universe that physicists can't explain. How is that possible? Join us as we break down the 4 greatest mysteries of physics in this episode of SciShow hosted by Michael Aranda!

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https://www.space.com/25075-cosmic-inflation-universe-expansion-big-bang-infographic.html
Why we need inflation: https://www.space.com/42202-why-we-need-cosmic-inflation.html
https://www.space.com/42261-how-did-inflation-happen-anyway.html
Inflation review: https://arxiv.org/pdf/hep-ph/0304257.pdf
Evidence for inflation https://www.forbes.com/sites/startswithabang/2019/05/11/ask-ethan-how-well-has-cosmic-inflation-been-verified/?sh=7ad0a2891d07
GW detection: https://iopscience.iop.org/article/10.1088/1475-7516/2021/01/012
Penrose cyclic cosmology: https://aip.scitation.org/doi/abs/10.1063/1.4727997?journalCode=apc
https://physicsworld.com/a/new-evidence-for-cyclic-universe-claimed-by-roger-penrose-and-colleagues/

Fine-tuning:
Fundamental constants: https://www.forbes.com/sites/ethansiegel/2015/08/22/it-takes-26-fundamental-constants-to-give-us-our-universe-but-they-still-dont-give-everything/#4118be154b86
Fine-tuning 1: https://www.symmetrymagazine.org/article/fine-tuning-versus-naturalness
Fine-tuning 2: https://www.pbs.org/wgbh/nova/article/scientific-approaches-to-the-fine-tuning-problem/
Fine-tuning 3: https://www.forbes.com/sites/startswithabang/2019/04/05/fine-tuning-really-is-a-problem-in-physics/
Fine-tuning 4: https://plato.stanford.edu/entries/fine-tuning/
Fine-tuning 5: https://books.google.co.uk/books/about/Just_Six_Numbers.html?id=4XPhAgAAQBAJ&printsec=frontcover&source=kp_read_button&hl=en&redir_esc=y#v=onepage&q&f=false
Fine-tuning 6: https://www.cambridge.org/core/journals/publications-of-the-astronomical-society-of-australia/article/finetuning-of-the-universe-for-intelligent-life/222321D5D4B5A4D68A3A97BBE46AEE45
Anthropic principle: https://www.britannica.com/science/anthropic-principle

Theory of everything: https://www.quora.com/What-are-the-Grand-Unified-Theory-and-the-Theory-of-Everything-and-what-is-the-difference-between-them
GUT: http://nautil.us/issue/46/balance/a-brief-history-of-the-grand-unified-theory-of-physics
Theory of everything 1: https://www.forbes.com/sites/startswithabang/2017/07/08/ask-ethan-how-close-are-we-to-a-theory-of-everything/
ToE 2: https://www.space.com/theory-of-everything-definition.html
Alternatives to string theory: https://www.forbes.com/sites/startswithabang/2015/12/17/what-are-quantum-gravitys-alternatives-to-string-theory/#40cade6f7b1b
LQG: https://arxiv.org/abs/0711.0146
Unification: https://www.pdcnet.org/jphil/content/jphil_1996_0093_0003_0129_0144
Quantum gravity: https://arxiv.org/abs/gr-qc/0108040
Causal Set Theory: https://arxiv.org/abs/1903.11544
What is String Theory?: https://math.berkeley.edu/~kwray/papers/string_theory.pdf
Image Sources:
https://www.istockphoto.com/photo/star-field-at-night-gm501655522-81460875
https://www.istockphoto.com/photo/large-scale-structure-of-multiple-galaxies-in-deep-universe-3d-illustration-gm516145588-88855813

https://commons.wikimedia.org/wiki/File:COSMOS_3D_dark_matter_map.png
https://commons.wikimedia.org/wiki/File:Fermilab.jpg
https://en.wikipedia.org/wiki/File:Calabi_yau.jpg
https://commons.wikimedia.org/wiki/File:Spacetime_lattice_analogy.svg
https://commons.wikimedia.org/wiki/File:Storage_ring.jpg
https://svs.gsfc.nasa.gov/10137
https://en.wikipedia.org/wiki/File:CMS_Higgs-event.jpg
https://en.wikipedia.org/wiki/File:Planck_satellite_cmb.jpg
https://imagine.gsfc.nasa.gov/educators/programs/cosmictimes/universe_mashup/archive/pages/expanding_universe.html
https://www.istockphoto.com/
https://www.storyblocks.com/

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