How we plan to solve the "Crisis in Cosmology"

The "crisis in cosmology" has been plaguing astronomers for years now, so how are we planning to sort it out? To learn more about cosmology, head to http://brilliant.org/DrBecky and sign up for free. The first 200 people that go to that link will get 20% off an annual premium subscription. #crisisincosmology #sciencedebate

Planck collaboration (2019) - https://www.aanda.org/articles/aa/ful...
Reid, Pesce & Reiss (2019) - https://arxiv.org/pdf/1908.05625.pdf
LIGO collaboration (2017) - https://arxiv.org/pdf/1710.05835.pdf
Feeney et al. (2021) - https://arxiv.org/pdf/2012.06593.pdf

00:00 - Introduction
00:44 - What is cosmology?
01:14 - What does a model of the Universe need to explain?
02:09 - Our best current model λ-CDM
04:26 - Measuring the expansion rate of the Universe with λ-CDM
05:34 - Measuring the expansion rate of the Universe with galaxies
08:14 - THIS is the "crisis in cosmology"
09:05 - Is the data or the model the problem?
11:43 - How are we going to solve the crisis in cosmology?
14:05 - What does the future hold?
17:01 - Brilliant
18:04 - Bloopers

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📚 "Space: 10 Things You Should Know" - UK Edition: http://bit.ly/SpaceDrBecky

📚 US & Canada version: "Space at the speed of light" (same book, different title, with some beautiful illustrations): https://www.penguinrandomhouse.com/bo...

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🎧 Royal Astronomical Society Podcast that I co-host: podfollow.com/supermassive

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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...

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👩🏽‍💻 I'm Dr Becky Smethurst, an astrophysicist at University of Oxford (Christ Church). I love making videos about science with an unnatural level of enthusiasm. I like to focus on how we know things, not just what we know. And especially, the things we still don't know. If you've ever wondered about something in space and couldn't find an answer online - you can ask me! My day job is to do research into how supermassive black holes can affect the galaxies that they live in. In particular, I look at whether the energy output from the disk of material orbiting around a growing supermassive black hole can stop a galaxy from forming stars.

http://drbecky.uk.com
https://rebeccasmethurst.co.uk