20 Subatomic Stories: Is the Planck length really the smallest?

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A reasonable question of physics is if there is a smallest possible size and shortest duration and some scientists have claimed that there is and they are called the Planck length and Planck time. In this episode of Subatomic Stories, Fermilab’s Dr. Don Lincoln explains the truth of the Planck constants. It’s not what you think.

Don Lincoln article in Fermilab Today: “Planck length, minimal length”
 
Alden Mead’s 1964 paper: “Possible Connection Between Gravitation and Fundamental Length” (subscription required)
 
Frank Wilczek’s paper on absolute units
 
Mead and Wilczek’s public conversation

Energy conservation in general relativity: John Baez

Energy conservation in general relativity: Sean Carroll

Fermilab physics 101:

Fermilab home page:
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Thanks for answering my question Dr. Lincoln. I appreciate the links to more info and will certainly read them!

duggydo
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Tip: always know your plank length before you go to the hardware store.

richtalk
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I still haven't decided what I think about the uncertainty principle.

terryboyer
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It truly warms my heart to see Fermilab’s YouTube channel doing so well 🥰 it gives me hope for the future

iammichaeldavis
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Thank you, Don. The planck length being the length where our math breaks down answers questions and misconceptions I’ve had for years.

stevedixon
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A wonderful episode of Subatomic Stories. I learned so much new about our world! Thank you very much for this series Don Lincoln!

aberone_library
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" Planck time = zorblats " ...I need that tshirt

nkn_
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Between Subatomic Stories and Sean Carrolls videos I expect my PHD in Physics to arrive by the end of the year! Thank you!

StumpyMason_
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I've followed the channel for years and this is my favourite Fermilab video. Until now I thought the Higgs Boson going to Church was unbeatable.

Thank you Dr. Lincoln!

crouchingtigerhiddenadam
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I've said it before and I'll say it again: I absolutely LOVE this video series.

KarlFarbman
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My compliments to you for linking to papers that go into subject matter more in depth! This is needed for those that wish to understand concepts bwyond the cursory .Please continue in future videos.

markkaidy
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I understood about 1 zorblat of this talk but still find it interesting .

peterking
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I will henceforth quote my age in Zortblats

scottmuck
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You are great scholar and teacher sir. I wish and pray God that people like you to be in all education institution to teach science.

sreeshakv
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My goodness me - was this one of the best videos yet or what? Thank you so much Don - this scratched so many itches and answered so many questions that were lingering in my mind it is not funny. Thank you for making my week!!!!

Hossak
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Wow good no-fluff explanations without any sensationalism yet the man makes it interesting, entertaining and easy to digest. Never knew the real story behind the Planck units until now.

neoqueto
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Shout out to Dr Lincoln for showing us his childhood photos.

KafshakTashtak
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An interesting bit (Ignoring the ways the current models could break down):
- A Planck mass Schwarzschild black hole would be a Planck length across.
- A Planck energy photon would have a wavelength of a Planck length.
- A Planck energy is equivalent to a Planck mass (via E=mc²).

Naively, a photon of that wavelength should, by it self, be a kugelblitz: a black hole formed only from radiation. (Though I suspect that breaks down when you start asking about what reference frame you are measuring from, but it's still fun.)

benjaminshropshire
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Thank you for this video, after years of me trying to understand Quantum physics and either reading or seeing people talk in absolutes which prickled my mind into more questions than I started out with I can now see that those absolutes were not absolute at all but merely interpretations or extrapolations of what was known. Put more clearly I would read, "this is true therefore this must exist because (complicated mathematics I cannot fully understand)" which did not make sense to me. Persistence has paid off, thanks to people like you, Arvin Ash, PBS Space Time and others I am beginning to see a clearer picture.

StephenJohnson-jbxe
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Don: astrophysicists aren't funny.
Matt of Pbs Spacetime: 🙄

LeoStaley