- Видео 57
- Просмотров 13 484
Physics of the universe
Добавлен 17 июл 2021
This channel seeks to make cool and exciting areas of modern physics accessible, helping share the joy of science and the wonders of the universe to all enthusiastic adventures. Opening the door of physics to a wider audience. Focuses on this channel include the nuts and bolts of quantum mechanics and relativity, although sometimes other topics like black hole physics or electrodynamics also are included. There are also a few videos on mathematical tools used in physics, but often with an emphasis on their practical use and physical significance.
Rotating black holes
In this video we explore the size of rotating black holes and look at how a black holes rotation can effect it's radius. We also briefly mention naked singularities.
Link to video about size of non-rotating black holes: ruclips.net/video/hzXTMfz55A0/видео.html
Link to video about size of non-rotating black holes: ruclips.net/video/hzXTMfz55A0/видео.html
Просмотров: 10
Видео
A rustic and short video on: Why does the earth go round the sun at a constant speed??
Просмотров 3014 часов назад
A relaxed and rustic derivation video
Are stars spherical?
Просмотров 86День назад
A exploration of the geometric consequences of non-uniform centrifugal forces, upon the shape of stars
Escape velocity of classical black holes
Просмотров 99День назад
A video about the density and the sizes of classical black holes
What is a Dirac Delta function?
Просмотров 113Месяц назад
An exploration of the role of Dirac Delta functions in quantum mechanics, as well as a visually focused way of thinking about the properties of Dirac Delta functions Useful videos on the wavefunction: Wavefunction for free particles: ruclips.net/video/Bn7Qi8qr6Jw/видео.html Use videos on the wavefunction: Schrödinger's equation: ruclips.net/video/OJN9pL9Z9-E/видео.html
Why do particles diffract like waves?
Просмотров 139Месяц назад
In this video we derive the wave-like nature of free particles, from Schrödinger's equation, through using Schrödinger's equation to find a quantum mechanical equation for the wavefunction which has a clear classical analogue. Also discussed is why subatomic particles shows wave-like properties whilst you or I don't, as well as practical applications of the wave-like nature of particles in inve...
What is Schrödinger's equation?
Просмотров 224Месяц назад
In this video we explore Schrödinger's equation, looking at the assumptions that go into it and what it can describe. This is a fairly approachable explanation of the equation, avoiding a lot of the formal mathematics used to discuss it. Link to mug with equations : www.amazon.co.uk/Unemployed-Philosophers-Guild-Mathematical-Formulas/dp/B001237296 Link to linear algebra playlist (with eigenvalu...
How to interpret imaginary time for tachyons
Просмотров 101Месяц назад
During this video we explore the concept of imaginary time for tachyons and interpret what this physically means. Must used in this video: Music from #Uppbeat: uppbeat.io/t/iros-young/a-perfect-day License code: 8VMY7ILWDGJXQSR9 uppbeat.io/t/iros-young/impossible License code: K5XODJJORLZOCJSF
Tachyons: Particles which break causality
Просмотров 94Месяц назад
During this video we explore both the idea of causally connected events and the flow of time associated with these events. We look at how casually connected time is maintained under Lorenz transformations assuming no tachyon particles but how tachyon particles could in principle change the order of causally connected events. I also finish the video by unveiling truth behind a great mystery Audi...
Tachyons: Particles which move faster than the speed of light!
Просмотров 413Месяц назад
During this video we explore the speculative possibility of tachyons. We use the equations of relativity and the notion of spacetime diagrams, to uncover some interesting properties of tachyons including the possibility of "momentary particles" and their unusual relationship between mass and energy.
Virtual particles and four-momentum
Просмотров 198Месяц назад
In this video we review four-velocity (discussed in last video) before moving onto discuss four-momentum. We use four-momentum to understand the connection between relativistic momentum, relativistic energy and mass. This connection will lead to a exploration of virtual particles, including virtual photons with mass! Links to other videos on channel for more details on ideas mentioned, couple l...
Reacting to a Pseudoscience video on Quantum physics and consciousness
Просмотров 1062 месяца назад
This is a very impromptu video, where I listen and share my own personal thoughts when watching a pseudo science video on Quantum mechanics and consciousness entitled: "Consciousness creates reality". Any opinions I express are my own, although I try to compare statements made in the video to currently accepted scientific models. Link to original video: ruclips.net/video/MjGgqcyLpug/видео.htmls...
Four-velocity and wordlines
Просмотров 1272 месяца назад
In this video we discuss our latest four-vector : four-velocity. We discuss it's relation to four-position and talk about the importance of analyzing trajectories through spacetime in the context special relativity and string theory. We'll see that the invariant quantity associated with four-velocity (in the way we usually define this vector), is the speed of light
How the sun produces energy
Просмотров 1162 месяца назад
The sun produces energy through nuclear fusion processes by converting hydrogen in it's core into helium. However there where other historical ideas and in this video we explore these as well as considering how long the sun could last if it was a hypothetical hydrocarbon star.
Physics meditation
Просмотров 1182 месяца назад
Improvised relaxing piano music to help with study and meditation.
Deriving and explaining Einstein's famous equation: E=mc^2
Просмотров 1272 месяца назад
Deriving and explaining Einstein's famous equation: E=mc^2
Muon decay and the Lorenz transformation - Video 6 of Special relativity playlist
Просмотров 1582 месяца назад
Muon decay and the Lorenz transformation - Video 6 of Special relativity playlist
Quantum field theory for the gifted ammeter part 8: Klein Gordon equation
Просмотров 572 месяца назад
Quantum field theory for the gifted ammeter part 8: Klein Gordon equation
Visualizing Lorenz transformations - Video 5 of Special relativity playlist
Просмотров 3202 месяца назад
Visualizing Lorenz transformations - Video 5 of Special relativity playlist
Four-vectors, spacetime and glimpses of hyperbolic geometry - Video 4 of Special relativity playlist
Просмотров 1302 месяца назад
Four-vectors, spacetime and glimpses of hyperbolic geometry - Video 4 of Special relativity playlist
Visual guide to Maxwell's equations and vector calculus - Video 3 of Special relativity playlist
Просмотров 2,3 тыс.3 месяца назад
Visual guide to Maxwell's equations and vector calculus - Video 3 of Special relativity playlist
Understanding waves and the classical action - Video 2 of special relativity playlist
Просмотров 1,5 тыс.3 месяца назад
Understanding waves and the classical action - Video 2 of special relativity playlist
What is the theory of Relativity? : Video 1 of Special relativity playlist
Просмотров 2673 месяца назад
What is the theory of Relativity? : Video 1 of Special relativity playlist
Quantum field theory for the gifted ammeter part 7: Hamilton's equations and Poisson brackets
Просмотров 2453 месяца назад
Quantum field theory for the gifted ammeter part 7: Hamilton's equations and Poisson brackets
Quantum field theory for the gifted ammeter part 6: Field operators in QFT
Просмотров 1393 месяца назад
Quantum field theory for the gifted ammeter part 6: Field operators in QFT
What is the point of imaginary numbers in physics? Or has physics just gone insane?
Просмотров 973 месяца назад
What is the point of imaginary numbers in physics? Or has physics just gone insane?
Eigenvalue equation and its applications: Linear algebra (Part 2)
Просмотров 953 месяца назад
Eigenvalue equation and its applications: Linear algebra (Part 2)
Matrix multiplication (an intuitive approach): Linear algebra (part 1)
Просмотров 953 месяца назад
Matrix multiplication (an intuitive approach): Linear algebra (part 1)
Dude ur actually doin great i like your videos
yes they are
Good video
good video
Natural consolation…meaning…like particles react in kind…so..with proper vacuum..and proper temperature…wave forms easily.
For me, plane waves as free particles are the 'elementary particles' of quantum mechanics. From them one can build more localized particles like wave packets and delta functions. The energy (E = h . f) of a free particle is well-defined because it only has 1 frequency. The price we pay for that is that it is completely delocalized.
absolutely, there's always a trade off with quantum mechanics
Particles are just goofy.
absolutely
Thank you Julia Childs for the tachyon lesson -- I'll add it to my atomic cake recipe 🎉🎉❤❤
thanks - tachyons are cool particles
@jL6215-k7i the "strong force" is what keeps me laying down at night -- symmetry with the Circumference of the Earth In order to get outta bed and do work i have to channel my "weak" forces to accomplish anything Makes sense Hue-mans can sense electricity as well - "sympathetic resonance" is a law of nature - all humans can feel "electricity" because we are quantum - At a concert you can Feel the "Electricity" in the room - all of the bodies brushing against one another creating static etc... Moods also work by sympathetic resonance - not to be "cheesy" but we can absolutely feel "tension" in the air - that is unresolved 'potential' Scientist measure "feelings" all day long - they are trying to understand their own "emotions" - they want to put a number on it so it's predictable Thank you for the space to learn
Good video
why the voice?
he huffs helium
Indeed I do
I thought he was memeing with the voice but no he's dead serious and he actually explained tachyons really well
My advice: don't judge too fast.
Good
thanks
😊
Relax. Devil@its morons in Academia run the universe: the so-called Schrodinger's cats(alive or not)@an "ageing" Twin in Relativity while "travelling", etc.; here, they don't comprehend the difference between the measuring device and the operator of such device, a human- a proof of such Idiocy!
good
Good
@@brycejarvis2505good
thank you for this wonderful relativity course
thanks
I hope you solve the challenge, because I never understood why D"tau is invariant but D'T is not.
with regards to invariance, time in general is not Lorenz invariant (objects moving at different velocities appear to move at different rates through time). However D"tau is special in that it is how much time has passed for the 'moving observer', therefore correspond to the flow of time over which natural internal processes of the moving observer happen (eg. decay (if the moving observer is unstable particle, aging if the moving object is a human ect.)). Since D"tau is the amount of time which has seemingly passed for the moving object (its time interval in a specified reference frame), any observer will agree on the time interval in that reference frame (in this sense its like psuedo-lorenz invariant I guess). For example if your friend was to stand next to you and watch the truck go by, they would give the same value for D"tau. You could say this about time intervals in any specific reference frame. None-the-less quantities like spacetime intervals are invariant (which may can be written in terms of just D"tau or written in terms of D'T and D'x). Similarly choosing proper time as the passage of time, ensures size of 4-velocity is Lorenz invariant. However choose of using proper time as the measure of how quickly time passes, just leads to a special case of a more general equation for size of 4-velocity using time D't. For conciseness, in this video I think I said T was time for a stationary observer. More generally however, we could just say T just time from an observer perspective who sees the truck (whose world line is being described) move at a velocity v relative to them. Finding the equation for the size of four-velocity if it is defined in terms of the rate (in terms of time T) of change of four-position and putting v=0, should give the same answer as the size for four-velocity as it is traditionally defined (discussed in the video). That is because if v=0 then D't and D"tau are exactly the same (you are stationary relative to the truck so there is no effects of relativity at play). This is answer is probably a bit long, but hopefully helps out
In terms of the spacetime interval (distance between points in spacetime) being Lorenz invariant, D"tau ends up being proportional to it and is therefore Lorenz invariant indirectly. However this is only because general spacetime interval squared = (Temporal distance between events)^2 - (spatial distance between events)^2. However the proper time refers to time as it seems to click by on a clock resting on the moving observer, so in this reference frame the moving observer (eg. truck) is stationary so there are no spatial distances between where the truck is one moment compared to another in this reference frame. Proper time refers to time, in other words, in which the only distance between events in spacetime is due to those events being separated in time. Due to this and how the spacetime is defined, the spacetime interval then has to be proportional to proper time. However it is really the spacetime interval which is Lorenz invariant, but as a bye-product proper time ends up in a manner being invariant to. Again long answer but hope it helps. Will publish a solution to challenge in a few weeks
@@jL6215-k7i Thank You for taking the time to address my question with a detailed response. I remember there was a mathematical explanation I saw somewhere, but did not understand. It was not mathematically complex. It had something to do with the way you multiply different variables by gamma, but I didn't get it. I enjoy your videos, and particularly you clear and concise slides.
Nice video
thanks
Bro you absolutely COOKED on this video but some recommendations are: cooler transitions better mic quality more catchy phrases overall you did incredible but these are my recommendations these can be satisfied by using an editing software like Clipchamp which is free on windows again you did really well and applying some of the things i listed can help make you EVEN BETTER ❤❤🔥🔥🎉🎉
much appreciated and thanks for the tips
I feel like having a historical understanding lets you understanding the topic better.
If a large number of systems interact with one another, is decoherence inevitable? Can we estimate how close the systems should be/how long they should interact until the cross terms/coherences in the density matrix go to zero?
Awesome question (as with one below), am currently looking through some material to make a follow up video exploring decoherence in more depth, where hopefully some of these questions will be answered
Hmm how can the decoherence damping factor γ be determined? empirically?
Lets go
To infinity and beyond!
very helpful. thank you.
very clear and concise
Just discovered this channel and super excited to see what it offers. It looks really interesting and reminds me of Micheal Van Biezen.
tanks
Thank you
This must have taken a long time to make because it's very detailed and elaborate. One thing that I would suggest is to try to avoid having too many boxed things in your slides, like in some cases where you had multiple equations in red boxes etc. When there are too many "important" things on a slide - analysis paralysis kicks in - I find myself losing track of what's important and that can mess up the flow of your talk. I understand that you want to communicate as much knowledge as possible to your audience, but since I came to your presentation willingly I am of course interested in what you have to say. And so it's better to keep the bright red boxes for the "really important" remarks that you want to communicate to your audience. This is just some feedback that I wanted to share with you because I found your presentation fascinating. Thank you for your video and also for making it available on RUclips for everyone to watch!
Thanks, video is definitely full of content. good mention about the large number of blue boxes, looking back definitely a lot of them particularly in that video, have started using some less bold blue boxes in latest video on playlist (went for some more subtle thinner black ones instead) and will keep this trend moving with future videos on channel, thanks again for the comment, helpful to know and helps me with making the content as easy to watch and follow as possible
@ 7:13 I would say that strictly speaking it does not generate an amplitude, but a displacement from some equilibrium value. In the book the authors use the word amplitude most of the time in the sense of a probability amplitude.
@ 4:30 I guess String Theory WAS very popular ;-)
Mickey is that you?
No, it is Minnie
Good tech content, thanks for uploading!
A real human speaking and not an AI, yay!
Good material. Pedagogically well crafted lecture. I have an engineering background and am trying to learn QM, found this to be very good. Thanks!
Bro ur voice sounds so 😢 I can’t sorry homie u need more umph
The information and the intuition is top notch. Focus on the important bit if you're interested in learning.
Noice
I'd like to imagine the tensor product as having the options/eigenvalues: - Large cup of tea - Large cup of coffee - Small cup of tea - Small cup of coffee and the direct sum as : - A large cup - A small cup - (A puddle of) coffee - (A puddle of) tea what do you think?
That's a perfect summary of the direct sum!
Got to be one of the most intuitive/straightforward explanation of direct sum and tensor product I've seen so far. The resources I've read require so much.... "mathematical baggage"
So can I say that direct sum and tensor product provide ways to "extend" a system's degrees of freedom?
Many experiments have observed that nearfield electromagnetic fields propagate instantaneously. This can be intuitively explained using the following well known relation for electromagnetic fields: wavelength * frequency = c The frequency is absolutely known. But in the nearfield, the wavelength is not as clearly defined. And right next to the source the wavelength is not known at all, which means that the wavelength is infinite. So an infinite wavelength corresponds to an infinite speed for the field. In the far field at about one wavelength from the source the speed of the field starts to look like speed c. And according to Fourier Theory only infinitely far away from the source does the wavelength converge to one value. So the waves never converge exactly to speed c, even in the farfield. This argument shows that nearfield electromagnetic fields are instantaneous, and become approximately speed c in the farfield, after one wavelength from the source. But never achieves the exact value of speed c, even very far away from the source. Nearfield electromagnetic fields can also be explained by quantum mechanics using the Pilot Wave interpretation of quantum mechanics and the Heisenberg uncertainty principle (HUP), where Δx and Δp are interpreted as averages, and not the uncertainty in the values as in other interpretations of quantum mechanics. So in HUP: Δx Δp = h, where Δp=mΔv, thus HUP becomes: Δx Δv = h/m. In the nearfield where the field is created, Δx=0, therefore Δv=infinity. In the farfield, HUP: Δx Δp = h, where p = h/λ. HUP then becomes: Δx h/λ = h, or Δx=λ. Also in the farfield HUP becomes: λmΔv=h, thus Δv=h/(mλ). Since p=h/λ, then Δv=p/m. Also since p=mc, then Δv=c. So in summary, in the nearfield Δv=infinity, and in the farfield Δv=c, where Δv is the average velocity of the photon according to Pilot Wave theory. Consequently the Pilot wave interpretation should become the preferred interpretation of Quantum Mechanics. It should also be noted that this argument can be applied to all fields, including the graviton. Hence all fields should exhibit instantaneous nearfield and speed c farfield behavior, and this can explain the non-local effects observed in quantum entangled particles. Nearfield light is instantaneous and the effects of this will change all of modern physics. Experiments have now shown that nearfield light is instantaneous, and it only becomes approximately a constant in the farfield, starting about 1 wavelength from the source. This is supported by Maxwell electrodynamic theory. This has been verified by many researchers. In addition, a resent experiment showed that the front (ie information) of a nearfield electromagnetic pulse propagated instantaneously across space. This is incompatible with Relativity theory, which only based on farfield speed c light. A derivation of Relativity using instantaneous nearfield light, yields Galilean Relativity, where time is the same in all inertial frames and no Relativistic effects are observed. This can be easily seen by inserting c=infinity into the Lorentz Transform, yielding the Galilean Transform. So, Relativistic effects will observed if a moving body is observed using farfield light, but no Relativistic effects will be observed if instantaneous nearfield light is used. How can the effects of Relativity be real if they can be switched off by simply changing the frequency of the light used to observe them. The only possible conclusion is that Relativistic effects are just an optical illusion, and that Galilean Relativity is the correct theory of Relativity, where time is absolute, only the present exists, the past is gone, and the future is yet to be. Since General Relativity is based on Special Relativity, then it has the same problem. A better theory of Gravity is Gravitoelectromagnetism which assumes gravity can be mathematically described by 4 Maxwell equations, similar to to those of electromagnetic theory. It is well known that General Relativity reduces to Gravitoelectromagnetism for weak fields, which is all that we observe. Using this theory, analysis of an oscillating mass yields a wave equation set equal to a source term. Analysis of this equation shows that the phase speed, group speed, and information speed are instantaneous in the nearfield and reduce to the speed of light in the farfield. This theory then accounts for all the observed gravitational effects including instantaneous nearfield and the speed of light farfield. The main difference is that this theory is a field theory, and not a geometrical theory like General Relativity. Because it is a field theory, Gravity can be then be quantized as the Graviton. *RUclips presentation of above arguments: ruclips.net/video/sePdJ7vSQvQ/видео.html <ruclips.net/video/sePdJ7vSQvQ/видео.html> *More extensive paper for the above arguments: William D. Walker and Dag Stranneby, A New Interpretation of Relativity, 2023: vixra.org/abs/2309.0145 *Electromagnetic pulse experiment paper: www.techrxiv.org/doi/full/10.36227/techrxiv.170862178.82175798/v1 Dr. William Walker - PhD in physics from ETH Zurich, 1997
I’ll pay for tutoring if you’re good
Keep going!
Amaying lectures thank you so much