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!.

@constpegasus

8 жыл бұрын

+WonderzStevey I agree.

@quahntasy

7 жыл бұрын

I make videos like these but noone watches.So we stop making it.

@vampyricon7026

7 жыл бұрын

+

@pabloagsutinnavavieyra2308

7 жыл бұрын

+Quantasy I don't want to sound unkind but it's easy to say that nobody qatches your videos if you have just made two. Sucess takes time, effort, an luck (that favours the bold)

@zaaz4046

6 жыл бұрын

Nope. Though he said mass possesses energy, he didn't mention how fields of energy are quantised (smallest quantity) in space and appear like mass or particles? I mean, how a quanta of a field spins & rotates at ultra high speed to appear like a sub-particle (eg electron) and then bond in an orbital motion to appear like a particle (atom)?

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

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

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.

@tonyellen_

4 жыл бұрын

Hear. Hear!! I second that!

@thecomprehensionhub4612

3 жыл бұрын

Hope you are well Ralph, never stop learning

@RalphDratman

3 жыл бұрын

@@thecomprehensionhub4612 Why thank you. And you too, I hope.

@sultanhanga

3 жыл бұрын

@@RalphDratman Ralph is physics too hard to understand for none physicist people like me ?

@RalphDratman

3 жыл бұрын

@@sultanhanga That depends on what you would like to understand. Physics is an enormous subject with hundreds of fields of study within it. Can you give me an example of something you would like to know about?

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

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

@constpegasus

8 жыл бұрын

+ScienceNinjaDude That's good.

@zubmit700

8 жыл бұрын

***** Pleased to hear!

@amormondragqueen

8 жыл бұрын

+ScienceNinjaDude Strings would be awesome, too!

@CraftyF0X

8 жыл бұрын

+ScienceNinjaDude Always thought you are Lincoln himself. Nevertheless, Im pretty sure you know him personally.

@CraftyF0X

8 жыл бұрын

Either case I like his presentations a lot, he is a great man doing great stuffs and also top quarks enough to say...

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.

Great stuff as always Dr. Lincoln and the fermilab team

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

Wonderfully Eloquent Lecture on QFT thank you Fermilab!

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

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!

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!

@materiasacra

8 жыл бұрын

*seconds* -> hours

Really glad to find your videos after all this time. Can not wait to see more of them. I subscribing now!

love this channel!! thank u for posting all these.

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.

@JB-dv7ew

2 жыл бұрын

I know this comment was 5 years ago but they just released an explanation on the double slit experiment on August 4th, 2021.

Very informative, keep doing these fantastic videos! Thank you so much.

That really is a cool idea and it kind if relates to the string theory which I always found confusing. Thanks for this simple explanation. I understand it better now.

I'm so glad I found this channel. It's always great to see a new video. How about all this excitement about gravity waves?

Now I know how to 'field' questions on particle physics!

@mellowfellow6816

6 жыл бұрын

I have detected a vibration in the dad field

These are really great videos. Have you made one on the Double Slit experiment ?

A worthwhile descriptive overview of some aspects of QFT.

great video, keep them coming!

this is a great channel, thank you for this video

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

@roy04

3 жыл бұрын

My mom found out. She said stop wasting time on things you don't understand

@divyanshugreninja6692

3 жыл бұрын

Lol

One more interesting video would be if there are any models that show arrangements of the nucleons? Are there any experiments or super computer models to show the probability models of quarks like the orbital models chemists have for electrons around the nucleus?

this channel needs more views.

Very good explanation of the very difficult things

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

Continue ur great work.

Thanks for this nice explanation

If there are different fields for each ‘particle’ then where do the fields originate? Why are they different ? Further. What causes the vibrations in the fields in the first place?

i was introduced to this idea today and i rushed to Fermilab for more insight about this idea.

THANK YOU PROFESSOR LINCOLN...!!!

I have been hoping for this one...

Wonderful thankyou and please keep this going!

The differential clock times between a moving clock and a stationary clock: Were the magnetic field changes, gravitational field changes, neutrino impacts between the two, etc., all taken into account???

Bravo! I finally understand. Perhaps one day you will favor us with your insights into gravity from the perspective of quantum field theory.

@constpegasus

8 жыл бұрын

+Richard Palmer What was you lost on before. I thought I had a grip on this subject but this video has me lost on most of it.

This is uncertain to me: If we measure spin direction of an electron, and after that we measure position; does the spin probability change, because we made the second observation? I.e. are the previous measurements always garbage after succeeding measurements?

Great work sir keep it up

In chemistry we learned Quantum mechanics applied to chemistry. There is a change if we applied Quantum field to chemistry? Fermilab did You known If have some book/reference ir even a online course of Quantum field to chemistry? Because in Quantum chemistry, we still see atoms as particles surronding the nucleus, and still Very difficult to visualize the atoms model in fields perspective and another things as chemical bons, intercations..... Can you help me to solve this? Thanks

Thanks fro a great summary! :-)

Today I quantized my first classical field. It felt so good.

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

I thoroughly enjoyed this one!

Thanks for bringing so complicated topics into an understandable matter.Who said these enlightening lectures only for children .Indeed it is a feed for science hunger minds.

Fantastic video!

I have a question which bugs me ! If electrons have properties of a wave(also) ... What kind of wave it be ? (Mechanical or transverse)

Wonderful. Thanks!

Is it true that all these fields are 3d filling all of spacetime presumably throughout the universe?

What job can I get after learning QFT other than working in research or on CERN?

What is the difference between Feynman's and Schwinger's quantum field theories?

@vinitchauhan973

5 жыл бұрын

I couldn't give you an exact answer since I haven't studied them in depth. However I believe feynmans theory of QED uses diagrams like feynman diagrams to describe particle interactions while schwinger theory is much more mathematically rigorous

To create a field makes necessary to have a source. Question: e.g. where is the source of a "Quark Field"?

Could you show the difference between the field and ether?

Thank you sir, good explain 🙏

Noob with a question here. When String Theorists talk about strings, do they actually mean these waves in these fields?

If h = c = 1 in QFT what would be in Quantum Gravity Theory (QGT) ?

How do the different fields "talk" to each other?

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

@AlexanderFable

4 жыл бұрын

From what I can gather (having binged a number of quantum mechanics videos but never studying the subject academically) the idea of one field being a combination of another field (or fields*) could be described when looking at quarks. I think that when you subscribe to quantum field theory, you replace the notion of "particles", meaning one little piece of spherical matter, with the idea of a field. That would mean that protons' and neutrons' fields are actually the result of the interaction between the three fields of their components: the fields of the up and down quarks that make up protons and neutrons. I think the best way to answer your 2nd question is to refer back to how I answered your first: the fields simply interact when they are in range of each other. Or another answer I would assume might lie somewhere within the ideas behind quantum entanglement; meaning the fields don't actually interact as much as they simply demonstrate their properties literally simultaneously at the moment they are measured/observed. I sincerely hope someone with more advanced knowledge on the subject responds because I would love to know how accurate my assumptions are!

@SuperMenders

4 жыл бұрын

@@AlexanderFable 1) no, every field is described seperatly 2) i think you cannot answer this in words. The interaction is described by the lagrangian of the field-theory. From this lagrangian you can derive the Feynman-Rules for Vertices (which are desribing the interaction of particles)

@bezbezzebbyson788

3 жыл бұрын

@@SuperMenders after applying euler-lagrange to interaction lagrangian you get terms that has products of different fields in the equation of motion. So the evolution of a field is dependent on these new product terms with new fields. So The new fields "interact". You don't need to put lagrangian crap for laymen it's just way to get EOMs knowing symmytries just go straight to the EOMs and explain the interaction terms "that are additional to a free wave equation".

@bezbezzebbyson788

3 жыл бұрын

@wayne to answer you. Every field is seperate. But if in the equation of time evolution of some field you found products of "same/other" fields. Then these fields affect its change with time i.e. "interact"

This one was great. It would be really awesome if You could do a few more that maybe go a bit more in depth on this subject :)

@tompyszczuk6876

8 жыл бұрын

Thanks for the replay and that is great news. I love those videos, and actually they were one of the main things that pushed me to investigate more about physics in general.

Can you explain more about the second quantum revolution.

very nice video on QFT. As shown in the graphics animation, does space warp when oscillating filed moves ?

@bezbezzebbyson788

3 жыл бұрын

No what he showed was just a graph of the field. Qft is done on a flat space

@bezbezzebbyson788

3 жыл бұрын

A field is just a function of every point in space-time after all. And has graphs.

This is important even for theoretical physicists to learn

@TimTeatro

8 жыл бұрын

+youssef albanay Theoretical physicist *do* learn this---it's the price of entry into the _theoretical physicists club_.

Thank you alot, you are awesome.

So, when an electron gives off a photon, does it "create" the photon field, or does it just add vibration to an already-existing nearby photon field?

@jeffheath2314

6 жыл бұрын

I dont beleive photons are matter and i beleive they move through the higgs field!

@PhysicsMeerkat

6 жыл бұрын

Look up these exps Planck BBr, Einstein photoelectric.

@shockingtube5710

5 жыл бұрын

Makise Silwer you mean EXPOSE? Yes. Einstein was wrong. There is no such a thing like particles at all.

@elams1894

5 жыл бұрын

@@shockingtube5710 - I agree, this particle nonsense has got out of hand. Modern science has got caught up in a sea of BS. Not one mention of Tesla. Classic field theory now somehow has 'Quantum' as a prefix. We have lost the ability to think for ourselves because we believe we must parrot the BS about bumping particles.

@josephisrael8959

5 жыл бұрын

@@shockingtube5710 "There is no such thing like particles at all?" I'm new to quantum physics so please bear with me. So, does that explain why physicists refer to electrons as a wave function (Due to QFT)?.

I have a question I've been thinking about for a week or so: so a particle, under Quantum Field Theory, is a localized excitation of a field (with the proviso that we're talking about a quantum theory, so "localized" is...fluid, maybe). For example, the lepton field. Now, all of the observed leptons, like the electron and the neutrino, all have very specific masses, right? What happens if energy passes through the lepton field and it's not strong enough of an excitation to be an electron? Let's just say it's an amount of energy too weak to be quantized as any kind of classical particle. What happens there? Does it register to scientists as having existence, i.e., do wave fluctuations have to reach a certain magnitude in order to "be" anything at all. What would we call this wave that has half the mass of an electron? Would it look like a particle in any way? Is this possible? tl;dr: if an excitation of a field is too weak to register as a classical particle, then what do we see it as? What would "half an electron" (in terms of its energy/mass) look like to scientists? Thanks if anybody can help me out with this one.

@beyondthecircuit

8 жыл бұрын

+ScienceNinjaDude Thanks, ScienceNinjaDude. Yeah, I realized since I asked that questions that, in thinking about QFT, I basically forgot about the basics of quantum physics itself. For example, that there are the specific electron orbits that require specific amounts of energy to excite. In the Feynman diagrams, when you see two electrons approach one another, and then one emits a photon, which the other one absorbs, and then that interaction causes both of them to change velocity, before the second electron reemits the photon: can we also understand this as energy passing through the different fields? So energy has managed to excite two electrons, then some of it travels to the other electron via the electromagnetic field, etc.? Is that in keeping with what QFT, at its more layman level, is saying? Which would give some sense of why you could potentially have a situation where the photon might turn into a quark/antiquark pair and then back into an electron and then maybe momentarily into some third type of particle? It's just that the energy itself is passing through the different fields? I guess my original question, then, about the energy that isn't strong enough to excite the lepton field is maybe wrongheaded. Would it be a philosophical question to ask if energy requires a field to pass through, i.e., to "exist" at all, or is that a legitimate scientific question we know the answer to? Basically, is all of the energy in the universe collectively present in at least one of the [known?] fields at all times? Does QFT say this is the case? Can energy simultaneously and directly excite two fields at once, not just indirectly? Sorry for having a billion questions. Physics is fascinating.

@t3db0t97

7 жыл бұрын

As ScienceNinjaDude said, the answer is the 'quantum' in QFT: there are indivisible steps of energy. Below that minimum energy, you have no particle.

What did you meant by quantisation of field?

Thank you for such a helpful presentation. One thing I'm struggling to understand: A field is shown as curvy, distorted space in the presence of a particle (or energy). That seems to indicate that gravity (general relativity) is already taken into account in QFT!?

@superlambmilkshake4904

2 жыл бұрын

no, the 'field' that is curved in general relativity is spacetime, the fields that are vibrating in quantum field theory are electron fields, up quark fields.. and so on.

Can quantum fields be described in energy / wave terms of frequency and amplitude, in contrast to matter / particle terms of position and velocity? Might help to get better feel of energy / waves when talking about quantum fields?

@robinhodson9890

2 жыл бұрын

Fields describe both a particle and a wave though.

ah, where does the vibration in a stagnant field comes from st the first place?

What implications does qft have on the interpretations of quantum mechanics

@materiasacra

8 жыл бұрын

None that are specific to QFT. All the essence of the interpretation discussions is already contained in the familiar situations like the 2-slit experiment, Schrödinger's cat, and the various models of the observation process. QFT is a straightforward application of the machinery of QM to fields. There may be a legitimate question about why it works in this case, and whether there are other ways to think of it besides the usual (escaping the 'tyranny of the harmonic oscillator', as Tony Zee puts it in his book QFT in a Nutshell), but no substantial progress has been made here.

@benYaakov

3 жыл бұрын

Clearly it's essence makes the wave function theory stronger .

If particle a quantum of energy, does adding an amount of energy collapse the quantum wave, then when enough energy lost the quantum wave reappears?

I can't find anything on this via a simple google search, so I'll ask it here: are antimatter particles permutations in a quantum field, only inverted? For instance, normal matter would be the peaks in energy, antimatter would be troughs, and the lowest energy state (vacuum energy) would be equilibrium. Or am I far off the mark?

How are quantum fields related to quantum waves? Are quantum fields the same as quantum waves, or are quantum fields all the quantum waves together, like waves in the ocean?

So in QFT does one need a field for every known elementary particle or can we simply have a lepton field and a hadron field and with the right energy excite the lepton field in such a way that an electron is produced? Excite the lepton field differently with just the right energy and a muon is created? Please comment.

@materiasacra

8 жыл бұрын

Every type of particle has its field. There are 'Grand Unified Theories' that to some extent do what you want, but these have not been confirmed experimentally.

what video explains the problems with quantum field theory?

So when we talk about mass of an electron or mass of a photon, according to QFT, is it 'mass' of a 'vibration' ?

Great job! I have tried to explain OFT to those who even "get" relativity without much strenuous mental acrobatics (so I know 'I'm not a terrible communicator lol) but OFT I just can't simplify. I'm going to forward tis video to everyone I can recall who'se ased me about it lol

Everything is just a bunch of vibration that ring strong enough to resonate on a multitude of fields that compose existence. So the more i give matter energy, the more it rings ? Does that mean that the hotter a particle get, the more it exists ?

So what we observe, an electron, proton, etc, is the physical manifestation of the vibrations in their respective fields? If so, is the entire universe just layers of these fields?

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.

In a quantized reality where everything can be defined as a particle, no motion is possible. I understand that time drops out of the equations but on simply the thought experiment level this is also the case. There is no “continuum” by definition, just particles. The spume or foam or fabric of space-time has to have some property that allows the quanta to go in and out of existence so things can appear to move. (Or something like that)

Good videos, now create a short series or theme for each subject please.... not too much math but just enough for perspective. I can do the rest of the math myself.

Would it be a good idea to explain QFT using some highly simplified physics? If the maths is hard for our universe, could a more complete explanation than this video be taught to a layman (who understands upto basic calculus) by simplifying the unerlying physics of the fields and their interactions using a kind of toy universe?

@materiasacra

8 жыл бұрын

QFT teaching always starts with toy systems, such as a real scalar field without any interactions. However, this is already quite taxing on students. It takes a lot of technical and conceptual effort to make this step. So I'm not optimistic about your suggestion of teaching it to layman. It is certainly possible to give laymen (with a bit of calculus) a somewhat more detailed impression of what the theory implies, but I would not call this 'teaching'.

With 37 different types of elementary particles/waves, and four dimensions of spacetime, doesn't that require 148 dimensions (or 37 4D layers) to hold them all though?

So is that what "quantum froth" is? A combination of subatomic vibrations? I think I'm getting this.

So Dirac's theory is a QFT, but different from QED?

pretty please, with sugar on top, what song is the out song?

So cool!

In all examples I see a single plane is shown yet there would be infinite planes around each object, would there not?

Are quantum fields the underlying energy for classic matter?

Dear teacher i need some help about math problems & drivation of some papers in this field qft.would you help me?(only mathemathical problems)

So I wonder, how many individual vibrations in all the various fields are occurring at any given time in the total universe?

V2U2: Sir, love your show.. big fan.. Can you please explain how quantum computer could interact with quantum field's and also, how the spin of electron, proton and neutron actually function in these layers.. Thank you for your time..

Thank you for explaining that quantum field theory is an interpretation and not necessarily what objective reality is. A lot of popular science misconstrues what these mathematical theories are and makes it seem like physics somehow proves that physical reality is some crazy thing that it's not.

What is the field made of? I mean, if a vibration in a pond is a particle, then the water is still water...

Offer that quantum field vibrations can be construed as "strain vibrations" in the fabric of space-time, viewed as an elastic "membrane". Stable vibrational modes of the fabric (propagating through space & time) are perceived as "particles". The metric of GR describes static strain, wavefunctions of QM & QFT describe dynamic strain ("strain vibrations" or "strain oscillations" in the fabric) There are not multiple particle fields. There is only one fabric. It has many stable modes of oscillations. Vaguely analogous to solids having S and P modes of vibrations, the fabric of spacetime has "u" and "d" and "e" and "v" and "y" and "g" and "W" and "Z" and "H" and perhaps other possible vibrational modes. "UNI-fication" = "only get ONE toy from the toy store" = only one mathematical-physical structure the fabric of space-time could, alone, account for all phenomena. All there is is the fabric, whose curvatures & undulations account for forces (e.g. gravity) and particles (e.g. fermions)

I liked the animation in 1:44 all the letters were appearing randomly (random combinations of 21 character) untill the equation is shown and the title became shrodinger's equation which represent the core idea of quantum mechanics .

Can thoughts be quantized?

Quantum field theory, I think the most fundamental aspect of understanding this universe.