We're not done with gravity yet - General Relativity hasn't had the final say. Go to http://brilliant.org/DrBecky and sign up for free. The first 200 people that go to that link will get 20% off the annual premium subscription.
00:00 - Video Introduction
01:00 - A brief history of gravity
01:59 - Einstein's theory of General Relativity
06:21 - Problems in Cosmology and why we care
08:46 - How do we come up with new theories of gravity?
09:23 - Starting with an observation e.g. MOND
12:20 - Adding an extra field/force
14:12 - Adding extra dimensions e.g. string theory
16:25 - Conclusions
19:09 - Bloopers
Thanks to Dr Oliver Tattersal, an expert on modified gravity theories for helping me with the content of this video: https://www2.physics.ox.ac.uk/contacts/people/tattersall
Here are the review papers that he sent my way to get me started for those who want a deep dive (note: written for the academic community - you may prefer to read Pedro Ferreira's book 'The Perfect Theory' which is written for a public audience: https://www.amazon.co.uk/dp/B00CTMAAN4/ref=dp-kindle-redirect?_encoding=UTF8&btkr=1)
Ferreira (2019) - https://arxiv.org/pdf/1902.10503.pdf
Berti et al. (2015) - https://arxiv.org/pdf/1501.07274.pdf
Clifton et al. (2012) - https://arxiv.org/pdf/1106.2476.pdf
And BONUS - a fairly recent review on String Theory from Mukhi (2011) - https://arxiv.org/pdf/1110.2569.pdf
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The artwork in the background is a scientifically accurate map showing the orbits of more than 18000 asteroids in the Solar System, created by Eleanor Lutz. Find out more and buy one here: https://eleanorlutz.com/mapping-18000-asteroids
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📚 "Space: 10 Things You Should Know": http://bit.ly/SpaceDrBecky
📚 US & Canada version: "Space at the speed of light" (same book, different title): https://www.penguinrandomhouse.com/books/635406/space-at-the-speed-of-light-by-dr-becky-smethurst/
📚 German translation "Das kleine Buch vom großen Knall" : https://www.dtv.de/buch/becky-smethurst-das-kleine-buch-vom-grossen-knall-28254/
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👩🏽💻 Dr Becky Smethurst is an astrophysicist researching galaxies and supermassive black holes at Christ Church at the University of Oxford.
http://drbecky.uk.com
https://rebeccasmethurst.co.uk