December 1, 2021

Science

The world of science and technology

4 of Physics’ (Other) Greatest Mysteries

Physicists are interested in the big questions like "Where did we come from?" and "What is all this stuff?". But the answers to some of these questions, just lead to more questions. Hosted by: Michael Aranda

SciShow is on TikTok! Check us out at https://www.tiktok.com/@scishow
———-
Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow
———-
Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever:

Alisa Sherbow, Silas Emrys, Chris Peters, Adam Brainard, Dr. Melvin Sanicas, Melida Williams, Jeremy Mysliwiec, charles george, Tom Mosner, Christopher R Boucher, Alex Hackman, Piya Shedden, GrowingViolet, Nazara, Matt Curls, Ash, Eric Jensen, Jason A Saslow, Kevin Bealer, Sam Lutfi, James Knight, Christoph Schwanke, Bryan Cloer, Jeffrey Mckishen

———-
Looking for SciShow elsewhere on the internet?
SciShow Tangents Podcast: http://www.scishowtangents.org
Facebook: http://www.facebook.com/scishow
Twitter: http://www.twitter.com/scishow
Instagram: http://instagram.com/thescishow
———-
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

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/

Science News Source: SciShow