14 Subatomic Stories: Where Einstein failed - quantum gravity

Gravity is the most familiar of the forces and Einstein’s theory of general relativity describes it pretty well.  However, it fails in the subatomic realm and it will eventually need to be completely replaced by a new theory of quantum gravity.  In episode 14 of Subatomic Stories, Fermilab’s Dr. Don Lincoln talks about quantum gravity, including a couple of candidate theories.

Extra dimensions:

Dark matter:
 
Dark energy:
 
Superstrings:
 
Loop quantum gravity:
 
General relativity:

Fermilab physics 101:

Fermilab home page:

Gamma ray animation credit:
NASA/Goddard Space Flight Center/Cruz deWilde

[joshsusser]

I missed the particle physics joke call the other week, but here’s my best one:
Q: Why can’t you believe atoms?
A: They make up everything.

[SquirrelASMR]

Please keep uploading Dr Don! It makes my day!

[ll]

You and your team behind these videos are the best 🤗

[mysteryhombre]

One of the best science youtubers I have ever watched, so glad I found this channel!

[shanehebert]

Ok.. I think im ready for this.

Coffee: check
Cookies: check
Plastic on the walls for when my head explodes: check

[unslaadkrosis]

You explain physics in a way a humble biologist like myself can understand. Thank you!

[pwatsky]

Thank you for taking your time to help educate us!!

[schelsullivan]

Thanks to all the scientist who worked so hard to learn a new facts about our universe. When all I have to do is kick back and learn from great science explainers.

[clydeblair]

Brilliance is making the complex understandable.

[pranaranjanmohanty]

Dr Don lincoln will go down in history as the scientist with the best smile.
Thank you sir for making a chaotic quantum world easy to comprehend.

[militantpacifist]

You should make a shirt that says “Even at home physics is everything”.

[michaelglynn]

I can't think of a worthy question, but I love this stuff! Thank you.

[quantumkath]

Thanks for referencing your other videos. It's neverending.

[lonequark]

Don. 360p? Really..? Keep up the great videos - always a pleasure watching them :)

[subhashpatil]

Your way of explaining physics is awesome.

[feathersigil]

Hi Don. I know it's a long shot but I hope this question might make it to the next episode's Q&A. Why must gravity exist at the quantum level? Could gravity be an emergent property of a certain minimum level of mass?

[btcminer]

Ian't there any way to find either in quantum science ?

[Bassotronics]

Time is like fish in water.
Fish disturb the water around it which is relative to that particular fish, but the water balances itself out and preserves its flow and chemistry.

[ananyajoshi]

But if time dialation is different for different observes then which one is experiencing the correct time

[RandyJames]

I've read that when a photon travels at _c_ in a vacuum, it doesn't "experience" time. Doesn't it slow down when it interacts with the electromagnetic spectrum as it passes through a material such as glass? What is its experience with time in that particular instance?