What are virtual particles?

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Published 2024-04-17
Virtual particles are one of those topics of modern physics that just don’t sound real. How can particles just appear and disappear without anyone seeing them. In this video, Fermilab’s Dr. Don dives into the topic, giving us an understanding of how virtual particles arise from quantum field theory.

Casimir effect and quantum foam:
   • 9 Subatomic Stories: The crazy world ...  
   • Quantum Foam  

g-2 videos:
   • The physics of g-2  
   • What does the Muon g-2 experiment tel...  

g-2 playlist:
   • Muon g-2 experiment returns with new ...  

QED videos:
   • Quantum electrodynamics: theory  
   • QED: experimental evidence  

QCD video:
   • QCD: Quantum Chromodynamics  

Quantum field theory:
   • Quantum Field Theory  

Feynman diagrams:
   • Feynman diagrams  

Fermilab physics 101:
www.fnal.gov/pub/science/particle-physics-101/inde…

Fermilab home page:
fnal.gov/

All Comments (21)
  • This is the clearest explanation of virtual particles I've seen.
  • @wbgookin
    I love how the more advanced physics gets, the more it sounds like you're just making stuff up. :)
  • @DCDevTanelorn
    9:29 It’s great that Dr. Don reminds us that there’s plenty of room to understand all this better. That scientific theories are our current best understanding, not absolute facts.
  • @Schulstand
    There are channels that provide pretty satisfactory explanations, but yours always shines in that regard, I'm so glad I stumbled upon it, thanks for the video!
  • More of the deep dives please, great to get to field theory which does explain this tricky subject and clears the mind.
  • @Turnoutburndown
    That cover of Beach Boys “Good Vibrations” at the end is brilliant. Props to whoever made that!
  • @TedToal_TedToal
    I thought that was one of your best videos, especially the bit right at the end.
  • @richard84738
    Im just a layman but this dude makes THE best explanations I have ever heard. Are these seriously free videos? These feel like they should be behind a paywall.
  • @JonBrase
    The real question, I think, is "are particles real?". The more I learn about QFT, the more convinced I become that particles are just an emergent phenomenon at macroscopic scales. Virtual particles aren't any less real than particles on the mass shell, but that doesn't actually make them real.
  • @okiesam
    Finally an explanation that is understandable and not intentionally "mysterious".
  • @jacklinde7568
    0:42 - "I mean, just look right there. Do you see particles appearing and disappearing?" Me: "Oh, those particles? I thought we were calling them floaters. Maybe it's time I got my eyes checked."
  • @kiefnebula3464
    I can't wait for the next string of videos. Sounds like they are going to be epic. Thanks!! 🎉
  • This was a really great video, thank you. Appreciate all the work you do to make advanced topics accessible to curious laymen like myself.
  • @markdelag
    Thank you, Don, you are always worth watching!
  • I find it such a wonderful relief to learn about Quantum Field theory in this way. I very much appreciated the assertiveness, driving home the validity of this model. I know the standard joke is that the more one learns about QM the less one understands it, but here I find it actually *quite intuitive*. I am waiting with bated breath for more videos discussing these concepts further! I'm actually enchanted. Great video.
  • @Blackacreonfire
    With all of space being full of virtual particles, how do things move through space without any drag/friction?
  • @vick229
    Great and straight forward explanation