Quantum Field Theory

The subatomic world has long been known to be truly mind-bending, with particles that are waves and vice versa.  Cats are alive and dead and everything is governed by probability.

While this remains true, science has progressed since the invention of quantum mechanics and scientists currently use an extended form of quantum mechanics called quantum field theory or QFT.  QFT teaches us that all particles are waves that interact with one another.  If you thought the quantum world was weird before, modern ideas can give you a headache. In this video, Fermilab’s Dr. Don Lincoln tells us all about it.

[WonderzStevey]

All that i ask please don't stop making these videos, honestly it puts a smile on my face to see a notification from Fermilab and Dr. Don. Most down to earth way of explaining complex ideas!.

[Amox]

Fermilab is the best channel to understand complex particle wheN there is a gr8 teacher to explain us-Dr.DON LINCLON

[waynelast]

probably the one simple joy I have in life is to watch these videos ( and read) about physics.

[RalphDratman]

This is a wonderful presentation, the first even remotely clear description of quantum field theory I have seen -- and I've been reading about physics as a non-physicist for many years. Thank you for making this available. 

Incidentally, it does not seem more weird to me. In fact it seems more unified and comprehensible than the isolated Schrodinger picture, which only seems to make sense when talking about a single particle.

[zubmit]

I really like how you explain things. Please do more on this subject. It's very interesting!

[sephirothjc]

I love how these videos show you how cool it is to understand even the simplest of physics.

[frankschneider]

Nice, really liked that one. You may consider doing one or two more on general QFT and thereafter delve into QED and QCD.

[sebastiangil]

Thank you for making this video. It was a really gentle introduction to a very complicated field, while at the same time offering very good motivation for why it's relevant.

[offmedsnite]

Wonderfully Eloquent Lecture on QFT thank you Fermilab!

[barrybryant]

As much as I love the trippy idea of qft, i'd love to see more of the detailed math behind it. Even if I can't understand it all, it makes it more real for me. 12 seconds more of video. Love the channel!

[MrGoldenhigh]

Great stuff as always Dr. Lincoln and the fermilab team

[marie-claudeblouin]

the visualizations are so simple yet so powerful - well done Dr. Don and thanks!

[constpegasus]

What I would like to see:
1. The Fermilab explanation of the double slit experiment.
2 The quantam eraser experiment that goes with it.
3. Quantam entanglement.

[robertschlesinger]

A worthwhile descriptive overview of some aspects of QFT.

[smcic]

There are videos on YouTube of Richard Feynman talking about imagining all of the fields and how they interact (or not). Highly recommend watching it.

[jeffheath]

I've been nerding out lately watching and learning different fields of the science world and would just like to thank Dr Don and the lab for posting these wonderful videos ! I have a 9th grade education and a Ged, but i love science ive learned so much not that i could do the math but im deffinatly wrll informed and updated in the world of science especially the quantum physics aspects again thank you! Hope you got this!

[anonymousSWE]

I would highly recommend Sean Carroll's lecture about quantum field theory if you are interested in this.
He explains things very good I think.

[christinemills]

Hey Don, first of all, thanks for this very clear presentation! I'm struggling to understand how QFT explains why some particles have mass (electrons, quarks, etc.) and some (photons, gluons) don't, and to drill down even further, why massless particles move at c, whereas massive particles can have varying velocities (I know that a massive particle is limited to <c of course). Is this something to do with field density or... something?

[waynelast]

1) can one field actually be some combination of another field?
2 ) how do the fields talk to each other?

[minhdo]

When mom found me watching this she's gonna be proud>