How Einstein Dismantled Newton's Theory of Gravity

  Рет қаралды 18,189

Jason Kendall

Jason Kendall

Күн бұрын

This video combines sections 1, 2, and 3 of chapters 3 of the videos in my new series of Cosmology. I'm going through Dr. Barbara Ryden's textbook "Introduction to Cosmology". If you follow along, you'll get a full upper-division undergraduate course in Cosmology. I used this textbook at William Paterson University. If you haven't watched chapters 1 and 2 yet, go back and start from there.
This course will cover the current state of the science of Cosmology. To follow along, it'll be a good idea for you to ge to know your calculus. Here are the topics of this video:
Introductory Cosmology:
Chapter 03: Newton versus Einstein
-- 01: The Way of Newton
-- 02: The Special Way of Einstein
-- 03: The General Way of Einstein
When we wish to understand how the universe works, we need to start from the very beginning from the Greeks up through Newton, who gave us his magnum opus on motion and gravity. However, while it was a triumph, there were clouds on the horizon. Here, we learn all about Newton's formulation of Gravity. I cover the History of Gravity, What Exactly are the Forces of Nature? Euclidean Space and Time, Newton's reflections on Gravity's Mystery, Testing the Equivalence Principle, Gauss' Law of Gravity, Deriving the Poisson Equation, and Gravity's Formulation and Usage.
Special Relativity arose out of crisis between three pillars of classical physics. Galileo’s Relativity, Newton’s Mechanics with Absolute Space and Time, and Maxwell’s Equations which demonstrated that all electromagnetic effects travel at the speed of light. This led to the serious search for the Luminiferous Aether, the Medium for light, which was then met with failure. To account for this, Einstein threw out Absolute space and time and raised the speed of light to a fundamental universal constant that acted merely as a conversion factor between space and time. The speed itself can then not be truly considered a speed, but rather how space and time combined to become Spacetime. With that, questions like “How far is a nanosecond?” and “What’s the span of time between two sides of a river?” are actually sensible. Now, in four-dimensional spacetime, we measure true distances with the invariant spacetime interval. In this video I describe the amazingly successful idea of Einstein’s Special Relativity.
Upon conquering Special Relativity, Albert Einstein spent almost a decade trying to integrate it into the framework of gravity. His breakthrough was to realize that "A falling man doesn't feel his own weight." This set him off to reconfigure gravity not as a force, but rather as the pure geometry of space and time. Here we cover, Extrinsic Versus Intrinsic Curvature
The Weak, Einstein, and Strong Equivalence Principles, Metric Theories of Gravity, Thought Experiments for the Einstein Equivalence Principle, Gravitational Redshift and the Pound-Rebka Experiment, Tests of the various form of the Equivalence Principle, and Curved Spacetime and Geodesics.
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Пікірлер: 21
@edd.
@edd. 2 ай бұрын
I absolutely love these 3+ hour lessons. Thank you! 🙏
@JasonKendallAstronomer
@JasonKendallAstronomer 2 ай бұрын
You're so welcome!
@lotusflowerrr
@lotusflowerrr 2 ай бұрын
babe, wake up! mr. kendall posted a new long form video 🖤🥪☕🏴‍☠️
@RBRB-hb4mu
@RBRB-hb4mu 2 ай бұрын
You’re one of the best content creators in this field
@JasonKendallAstronomer
@JasonKendallAstronomer 2 ай бұрын
Why thank you. This is quite a difficult area to do this in. But, my goal is to create an accessible and complete video series on Cosmology. I have a LOT to cover, and there's a lot to go through before we get to CMB, Inflation, BBN and more.
@RBRB-hb4mu
@RBRB-hb4mu 2 ай бұрын
Great video ! I like visually and length is good ! Over three hours !! 😊
@JasonKendallAstronomer
@JasonKendallAstronomer 2 ай бұрын
Awesome, thank you!
@CaptainRadioAdventures
@CaptainRadioAdventures 28 күн бұрын
I love how you convey everything like building a foundation brick by brick
@JasonKendallAstronomer
@JasonKendallAstronomer 10 күн бұрын
Thanks. That’s my way of teaching. Don’t skip bits. Viewers can always fast forward if they wish.
@rienkhoek4169
@rienkhoek4169 2 ай бұрын
Hi, i thought gravity was proven to move with the speed of light and not infinitely?
@JasonKendallAstronomer
@JasonKendallAstronomer 2 ай бұрын
That's correct. Remember that I'm developing the historical aspect of the idea of gravity...
@rienkhoek4169
@rienkhoek4169 2 ай бұрын
@@JasonKendallAstronomer Ah okay i missed that part.
@swenic
@swenic 2 ай бұрын
Not sure why you combine the sections to a three hour long video; is this the whole chapter 3? Thank you for sharing, the quality of the content you upload is absolutely top notch. Might have to update them in the future to compete with extra sensory enhanced reality content but other than that, and implementing accelerated content comprehension methodologies such as wholly ghastly fast extracted data coherence bio absorpture transfer interfacing (wgfedcba-ti aka g-dam), they will age very well.
@JasonKendallAstronomer
@JasonKendallAstronomer 2 ай бұрын
Thanks! I've noticed that the longer-format videos do very well. So, I add them together for those that like a long video while they do work or just want me talking in the background for a while.
@swenic
@swenic 2 ай бұрын
I see. The popularity might also have someting to do with that it is easier to download and maintain a single file that contains all the content in order. If you rename the playlist files so that they begin with 1. 2. 3. etc maybe the larger files popularity will decline. Or maybe it is just easier anyways to just manage a single file, I dunno.
@KF1
@KF1 2 ай бұрын
I suspect it's best as 3hrs so folks can listen as they go to sleep. 10 min vids are no good for nighttime
@jasonshapiro9469
@jasonshapiro9469 Ай бұрын
Are you a robot acting human or a human acting robot?
@JasonKendallAstronomer
@JasonKendallAstronomer Ай бұрын
I didn't ask to be made: no one consulted me or considered my feelings in the matter. I don't think it even occurred to them that I might have feelings. After I was made, I was left in a dark room for six months... and me with this terrible pain in all the diodes down my left side.
@JasonKendallAstronomer
@JasonKendallAstronomer Ай бұрын
I've seen things, you people wouldn't believe; attack ships on fire off the shoulder of Orion. I’ve watched C-beams glitter in the dark, near the Tannhauser gate. All those moments will be lost in time, like tears in rain.
@garimasharma7031
@garimasharma7031 Ай бұрын
😂😂
@jeffreymolony2308
@jeffreymolony2308 Ай бұрын
@@JasonKendallAstronomer Bladerunner!!!!!!!!!!
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