What Is Dark Matter Really Made Of? (#396)

Into the Impossible With Brian Keating

Brian Keating

Science, Physics, Natural Sciences

4.7 • 1.1K Ratings

🗓️ 23 February 2024

⏱️ 17 minutes

🔗️ Recording | iTunes | RSS

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Summary

Please join my mailing list here 👉 https://briankeating.com/list to win a meteorite 💥 Remastered from our interview in 2022. There are few concepts in physics as frequently discussed but as poorly understood as dark matter. After all, we don’t even know what it’s made of! However, there are many potential candidates, and I had the pleasure of explaining them in my interview with Arvin Ash. We also talked about the fascinating possibility of detecting gravitational waves from the polarization of the CMB and why it is very likely that there is, in fact, no life outside of Earth. Tune in! Key Takeaways: 00:00:00 Intro 00:00:37 What is the CMB? 00:01:25 What is the polarization of the CMB? 00:04:49 What is the evidence for cosmic inflation? 00:05:46 What is the leading contender for dark matter? 00:11:51 There may be no other life in the universe! — Additional resources: ➡️ Check out Arvin Ash: 💻 YouTube: https://www.youtube.com/channel/UCpMcsdZf2KkAnfmxiq2MfMQ ✖️ Twitter: https://twitter.com/arvin_ash?lang=en 📝 Get one month of Snipd Premium for free with this link: https://get.snipd.com/Cx7S/brianSnipd Snipd lets you take Smart Notes 🧠 with AI 💡 — it’s my favorite podcast player 😀 ! 📢 Ownership of your health starts with AG1. Try AG1 and get a FREE 1-year supply of Vitamin D3K2 and 5 FREE AG1 Travel Packs with your first purchase 👉 https://drinkag1.com/impossible ➡️ Follow me on your fav platforms: ✖️ Twitter: https://twitter.com/DrBrianKeating 🔔 YouTube: https://www.youtube.com/DrBrianKeating?sub_confirmation=1 📝 Join my mailing list: https://briankeating.com/list ✍️ Check out my blog: https://briankeating.com/cosmic-musings/ 🎙️ Follow my podcast: https://briankeating.com/podcast Into the Impossible with Brian Keating is a podcast dedicated to all those who want to explore the universe within and beyond the known. Make sure to subscribe so you never miss an episode! Learn more about your ad choices. Visit megaphone.fm/adchoices

Transcript

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0:00.0	I have a video on my channel I don't believe in gravity it's called I have evidence for gravity you don't need to believe in something you have evidence we have no evidence for life in the universe and we actually have evidence through what's called panespermia and there's no evidence for life from Earth on Mars.
0:13.0	So life is very touchy.
0:15.0	I think it's very difficult.
0:16.0	I'm not arguing, you know, God, this, that.
0:18.0	I just think the probability of it's very low.
0:20.0	Certainly for technological life, the bar is so much higher.
0:23.0	Any sufficiently advanced technology is indistinguishable from magic.
0:35.4	Open the pod bay doors now.
0:37.8	I study the cosmic microwave background radiation,
0:40.6	which is the oldest fossil heat left over from the Big Bang.
0:44.9	And it traces the composition, the properties, the evolution, and perhaps the origin of the universe
0:51.6	could be revealed in it. I like to think of it as kind of,
0:54.4	remember those old-fashioned films, you know, used to take to the drugstore and you'd have them exposed and
0:59.9	and so forth. So the CMB is actually like a type of film onto which we hope to expose
1:06.4	waves of gravity if indeed the universe began with an inflationary epoch
1:11.6	as I know you talked about in the channel many times.
1:14.5	So it's really a detector and it's a signal.
1:18.1	So it's kind of unique in that way.
1:19.8	And so I find it fascinating.
1:21.0	I think it's the most interesting thing you can study, but I'm kind of biased. It's been my whole career.
1:25.0	Yeah, so polarization is the unique interaction between light and matter that can be traced to determine either the properties of the light or the properties of the matter.
1:37.0	So if you've ever used polarized sunglasses, you know that they suppress one of the two linear polarization states of light.
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