To see subtitles in other languages: Click on the gear symbol under the video, then click on "subtitles." Then select the language (You may need to scroll up and down to see all the languages available). --To change subtitle appearance: Scroll to the top of the language selection window and click "options." In the options window you can, for example, choose a different font color and background color, and set the "background opacity" to 100% to help make the subtitles more readable. --To turn the subtitles "on" or "off" altogether: Click the "CC" button under the video. --If you believe that the translation in the subtitles can be improved, please send me an email.
I hate the music with explanations in all your videos It is distrubing me making me nervous The musuc is loud and pass over the voice of speaker Excuse me but it is realy sh*t your videos are for sciences not videogames Do you want to send any subliminal's message with this music?!
I'm a physics student and I think you're doing an amazing job. This channel encourages me to learn animation and use them to explain physics just like you. Thank you!
The best geodesic explanation I've seen is with paper strips. Orient the strip so that neither side folds or leaves the surface - then you have a geodesic. Putting a straight line around a cone won't work, the side of the strip towards the narrower cone end will not make contact with its surface. It's effectively the same idea as the car wheels, but easier to simulate hands-on!
The car analogy attached on the surface gave it away for me! The wheels rotating with the same speed, cover different distances due to the curvature of the surface and thus the car turns accordingly but always moving fwd thus covering the least distance!
@@wilcovdberg You are right however that if you model gravity as a 'pit' in a surface, less velocity in a direction that escapes it will cause an object to fall earlier
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Amazing presentation. The accuracy of the graphics and narration kinda split at the end, which is understandable 😇 it’s also easier to learn when our minds start to fill in the blanks.
@@canyadigit6274 Motion is relative... From the perspective of the fallen object, the entire Earth is rushing up and hitting it and from the perspective of the Earth, the falling object is moving towards the ground and hitting the Earth... No reference frame is more true; than the other. Let me ask you this: Say you are inside a rotating room (an empty room with no windows or doors that just rotates around its central axes) Now inside that room you find a tennis ball. You pick it up and you throw it to the opposite wall, what would happen? Will the tennis ball go straight and hit the wall in front of you (since you threw it straight) or will it take a 90 degrees curved path to the right and hit the wall to your right? (or left depending on how the room is turning...) The answer is the latter. The tennis ball will take a curved trajectory and it will not go straight. And you might ask: "why does the tennis ball go to the right when I'm throwing it straight?" That's of course a bad question, because the tennis ball IS NOT actually taking a curved path, its YOU inside the room that is, that see the tennis ball take that curved path! The tennis ball was always going straight, it's only your own motion that made it look like it was curving. Like here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-bJ_seXo-Enc.html Now imagine the same idea but with "gravity" and in 4 intrinsically curved dimensions of spacetime and that motion that you have (the one that is equivalent with the motion of the room spinning) is in TIME and not in space! Imagine all of that and you have Einstein's picture of "gravity" and you also have the answer to why Einstein considered this his greatest thought: "A man in freefall will not feel his own weight" No, objects in free fall are not falling, they are not moving in space because there are no forces acting on them at all. The reason why we *see* them fall, is because we exist inside a curved spacetime but we "don't know it", our senses "don't know it" and they in fact interpret our curved minkowski spacetime as a non curved euclidean spacetime. The only way for a human to see reality as it really is, is to go somewhere, where spacetime isn't curved. And we have such a place, it's called "outer space" away from any Star or other Planet sized massive object. There spacetime has a very low curvature, and there, when you let something fall you can clearly see that is not moving in space. Here on Earth is still not moving in space, but our senses by interpreting this world as an euclidean one, (and not as a mikowsky curved one as they should) see the object fall when in fact it's not falling. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-QyeF-_QPSbk.html :)
"Special considerations must be taken when applying this concept to the higher fourth dimensional space-time of general relativity and this will discussed later in the video" *is only a 10 minute video* It's gonna be a good one.
6:50 "The geodesics that are swallowed continue to spiral downwards" that's only if there is no bottom to that hole. If there's a bottom at any point, the geodesics will return. So, if we ever see light emerge from a black hole, could we use that to calculate the spacetime structure?
Something similar to this could be a pulsar which is an object that collapses but doesn't have enough mass to create a black hole, spitting it's matter out in polarized jets and spinning hundreds of times a second, but are 20km across and almost the density of a black hole. Check out the NASA mission IXPE cause we'll get some insane data we've never gotten to explore before when it launches in about a year.
But scientist says the information that gets into blackhole will be destroyed, so if you fire a beam light in to a blackhole maybe when it exits the blackhole it will be in another form or something...Idk
"Straight" is an _ad hoc_ qualification that you have to specify when doing differential geometry; e.g., if you're doing the ordinary Euclidian geometry, two "straight" lines are "parallel" if they conform to Euclid's fifth postulate, and vice-versa...
Your videos are fantastic. The visuals, the narration, the music. True works of educational art by masters of their craft. Well worth waiting for. Thank you.
How do you create these animations? They are simply stunning. Imagine if we had these showing in every school, and if all physics was taught in this way. You are creating something powerful, hats off to your efforts!
The Dark Knight when the potential is zero: the only force present is the force normal to the surface: this doesn’t affect the Kinetic Energy hence the Kinetic energy remains constant: hence the speed remains constant
I've tried for months to compute the geodesics on a general ellipsoide (x/a)^2 + (y/b)^2 + (z/c)^2 =1 with a b c all different between 2 arbitrary generic points. Your animation shows the geodesic to wrap multiple times around. I had not considered that.
0:37 Oh yes it is only deflected by a small amount I totally don’t see two angles opposite of each other Ps 5:54 The reason why they end up converging and diverging because one is positively curve and one is negatively curved.
Last time I was this early people thought time was absolute! I love the title of this video, it shows you don't only appreciate math as a tool but also as something that can be aesthetic and fascinating
Gravitational time dilation tells you that distant frames in a gravitational field will begin to appear to move relative to you (they will accelerate relative to you) because rather than moving entirely in the time direction through spacetime, they will lose some of their 4-velocity in the time direction, relative to you, and transfer that 4-velocity to a spatial direction, this all appearing to you as a gravitational force pulling these object through space, and slowing them down in time.
Since both happen simultaneously, it is not entirely accurate to say that one causes the other. It might be more accurate to say that gravitational attraction CAN be explained using time dilation. It may be possible to do the reverse, but we do not know of any such way. So in the models that we have built, it appears that time dilation is more fundamental. But, there might be other viable theories (which we don't know of) that could explain time dilation as a consequence of gravity. Or maybe, both are emergent from something else entirely.
6:16 I think that sheet can imagined as a distortion in Space created by black hole and that lines as a light And I think this explain why light cannot escape from black hole but some of them can escape after spinning around it ?? *IDK I am right or wrong ?*
Imagine if you had to observe physics from a two dimensional plane. I feel like that's what's going on with black holes from our dimensional perspective. There's a direction we just don't understand 🤷♂️
Why Eugene's video are amazing: Spatial representations of concepts Color-coding to differentiate between different elements Contextual verbal guidance
Eugene Khutoryansky, we want to know more about you. Please give some information about where you seek your knowledge! Are you a professor? Do you own a degree? What do you do for a living? Very curious fan here just wondering
Gustovo, I would prefer not to go into personal details about myself on my RU-vid channel, at least not yet. Though, it is not much of a secret, if you Google my name...
This channel is really great! The explanation is really dynamic with the use of animation and calm explanation....Thank you for the good work and effort!
Another FANTASTIC video! What blows my mind is the animation starting at 3:45 - by the end, all the geodesics looks remarkably like the valence electron shell of an atom! Co-incidence?......
I do like these videos, but personally I think they'd be better with a bit less 'down time' and, relevant to this video, not repeating the same sentences, I feel if someone doesn't understanding something there's always the rewind button, but if you skip forward you might miss something. Thankyou for making these videos though! They really do help make more tricky concepts easier to grasp!
6:30 Yay geodesics spiral inwards towards the singularity never to be heard from again how lovely.Also rip Brown and green geodesics you will never be forgotten
Your videos are so calming. The music fits perfectly with the amazing animations. And your voice is also calming. You'd think that would make the videos less interesting, but it really doesn't. It makes them a good way to get in a good mood while learning about math and physics.
So, a geodesic is a locally shortest path between two points-in other words, the shortest path relative to curved surfaces-but not all geodesics are equally short, right? Thank you for the amazing animation!
6:20 i believe it's a good model of the event horizon, the light that managed to escape from the gravity, and also the light that was kept inside the black hole.
Straight line: the geodesic which lies on a flat plane. Straight line time: The measurement of the motion of an object or entity along this straight line. Cyclical time: time which measures motion along the surface of a discrete object.
Oh my God! Look what I just found! When looked from directly above, the arrows look like they are moving slower as they get closer to the center of the hill, as if they are affected by a gravitational time dilation!!!
When talking about General Relativity with people I've explained that the curved time component is what explains gravity. Everyone thinks I'm the crazy one LOL. Thanks for making this video, it's such a great explanation. Understand concept first, then it's pretty easy to grasp what the math is doing because it's no longer abstract!
This would be so much easier to follow with rainbow ordered arrows at the starting point, would make it easier tracking where the endpoint arrows came from
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