Hellow guys, Welcome to my website, and you are watching How do we know how much dark matter there is in the Universe?. and this vIdeo is uploaded by Dr. Becky at 2024-05-09T12:00:10-07:00. We are pramote this video only for entertainment and educational perpose only. So, I hop you like our website.
| Name | How do we know how much dark matter there is in the Universe? |
| Video Uploader | Video From Dr. Becky |
| Upload Date | This Video Uploaded At 09-05-2024 19:00:10 |
| Video Discription | AD - Go to https://ground.news/drbecky to stay fully informed with the latest Space and Science news. Subscribe through my link to get 40% off the Vantage plan for unlimited access this month only. | I often get asked how do we know dark matter exists? Which is why I've made a video on all the observational evidence we have before (linked below)! But occasionally I'll get asked how do we know *how much* dark matter there is, which is a really fun question. There's many different ways we can calculate this, including the ratio between normal (baryonic) and dark matter, but in this video I just wanted to highlight three different ways astrophysicists calculate this. Here's my previous video on all the evidence we have for dark matter - https://youtu.be/nbE8B7zggUg?t=104 My previous video on whether dark matter could be made of black holes - https://www.youtube.com/watch?v=d0wV5frSb6s My previous video on whether black holes contain dark matter - https://www.youtube.com/watch?v=9Qis5VDOd18 My previous video on why galaxies merge if the universe is expanding - https://www.youtube.com/watch?v=2OjNokItg3E Allen, Evrard & Mantz (2011; review on galaxy clusters observations) - https://arxiv.org/pdf/1103.4829 Zwicky (1933; first virial theorem paper in German) - https://articles.adsabs.harvard.edu/pdf/1933AcHPh...6..110Z Zwicky (1937; virial theorem applied to the Coma cluster) - https://articles.adsabs.harvard.edu/pdf/1937ApJ....86..217Z Alpher, Bethe, & Gamow (1948; big bang nucleosynthesis; behind paywall) - https://journals.aps.org/pr/abstract/10.1103/PhysRev.73.803 Alpher & Herman (1950; more BBN work; behind paywall) - https://journals.aps.org/rmp/abstract/10.1103/RevModPhys.22.153 Planck collaboration (2015; cosmological parameter results for our best model of the Universe) - https://arxiv.org/pdf/1502.01589 00:00 Introduction 02:04 Ground News AD 03:54 Method 1 - Galaxy Clusters and the virial theorem 08:49 Method 2 - Big Bang Nucleosynthesis 11:39 Method 3 - Cosmic Microwave Background 14:35 Outro 15:24 Bloopers Video filmed on a Sony ⍺7 IV --- 🎧 Royal Astronomical Society Podcast that I co-host: podfollow.com/supermassive --- 📚 My new book, "A Brief History of Black Holes", out NOW in paperback, e-book and audiobook (which I narrated myself!): http://lnk.to/DrBecky --- 📚 "The Year In Space" celebrating all things space in 2022 from me and the rest of the Supermassive Podcast team: https://geni.us/jNcrw --- 👕 My new merch, including JWST designs, are available here (with worldwide shipping!): https://dr-becky.teemill.com/ --- 🔔 Don't forget to subscribe and click the little bell icon to be notified when I post a new video! --- 👩🏽💻 I'm Dr. Becky Smethurst, an astrophysicist at the 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 |
| Category | Science & Technology |
| Tags | dr becky | dr beckie | dr beccy | dra becky | astronomy | astronomie | cosmology | cosmologie | NASA | JWST | james webb space telescope | hubble | expansion rate | universe | dark matter | cosmic microwave background | dark energy | baryonic matter | normal matter | big bang | nucleosynthesis |
