Does the Universe have Higher Dimensions? Part 1

What do physicists mean when they talk about higher dimensional spaces, or space-times? How could we possibly not have noticed if space was not three-dimensional? In this first part, we will talk about the history of spaces with extra dimensions and how they became connected to dreams of unified theories, especially Kaluza-Klein theory, its achievements and its problems. Next week, we continue with the modern theories of additional dimensions of space.

#science #mathematics #physics

0:00 Intro
0:33 Higher Dimensional Geometry
4:37 Kaluza-Klein Theory
6:00 Predictions of Kaluza-Klein Theory
7:48 Problems with Kaluza-Klein Theory
8:42 Kaluza-Klein for all Forces
9:48 Sponsor Message

[hesitantjaguar]

Ah yes, Saturdays are not complete without a good helping of knowledge from our friend Sabine

[hrperformance]

I can't get over the quality of these videos. Everytime I watch, I get filled with boundless excitement and motivation.
Next week can't come soon enough!

[paperheartzz]

Some parts go over my head a little... and yet I still love to learn how physics expands our understanding of the universe!

[RydarkVoyager]

I just loved it when Sabine starts quoting Dr. Kaluza in the original German (7:33). Certainly woke me up! LOL

[SliceSupeRStaR]

Never in my life I would have thought that I'd be waiting in excitement for a physics episode but here I am! Thank you!

[dougg]

My hope is some kid somewhere watches this type video and becomes inspired. How many Einstein’s have fallen through the cracks of poverty or abuse . Anyway this is a great service academic folks like Sabine is providing.

[benoize]

Arrgggghhhh... what a cliffhanger! Can't wait for next week's episode. Great stuff!

[AncientOfDays]

Out of all the physics youtube channels, yours is the best and most refreshingly upfront and real. Btw please keep doing your music video as well they’re pretty cool Sabine!

[nimo]

To explain such a complicated subject takes so much more than just understanding it… explaining in detail is the proof of knowledge

[stanlibuda]

Your videos are just great. If some one had told me that one time the best part of my saturday afternoon would be watching a physics vid ...

[wulphstein]

You should talk about the properties of regular spacetime, the physics constants, the number of dimensions, and attempt to answer questions about what spacetime is made of.

[TM-vhqg]

2:14 me watching this 4D structure in this 3D world on my 2D screen with my 1D brain.!


Turns out I became Einstein.

[luckyhiker]

I loved Sabine introduction when she said “in part one we will discuss things like Kalusa-Klein Theory and stuff like that.” - like I instantly was to know what she meant by “stuff like that.” Sabine is the greatest!

[brendonwest-mn]

Thank you Ms Hossenfelder. I am very grateful for your work.

[assante]

great stuff. Those vids remind me of school when a teacher would explain, and i listened fascinated, nodding, understanding, it was all so clear. And after i'd just go back being clueless.

[ideliversoftontario]

So clear explanation, just a pleasure to watch till the end. Thank you, professor.

[synthetic]

your content is so much better than dozens of documentaries... many thanks

[timthompson]

Thanks. That was helpful. I got an “A” in introductory linear algebra, but it was not very satisfying because I can’t visualize the results. That explanation of the three extra dimensions to include three dimensional momentum along with the position was interesting. I’m taking the Great Courses Linear Algebra course to refresh my memory and take it a bit further. Looking forward to the next video.

[vikramgupta]

This was the best overview providing the background on this topic I've seen. I'm glad the point about geometry of higher dimensions not be an easy given came up, and that it's fairly recent. I always wondered about that.

[filipslavik]

Will you do a video on the results of the muon g-2 experiment?