Lecture 5 | The Theoretical Minimum
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- Опубліковано 15 лют 2012
- (February 6, 2012) Leonard Susskind discusses an array of topics including uncertainty, the Schroedinger equation, and how things evolve with time.
Stanford University:
www.stanford.edu/
Stanford Continuing Studies:
continuingstudies.stanford.edu/
Stanford University Channel on UA-cam:
/ stanford
This genius deserve the Nobel for his fight against ignorance.
Skip to 0:52:00 if you listened to lecture 4. However if lecture 4 was sort of dull, this time he is in better mood and explains same things but more clear.
Super helpful comment, saved me some time
Lecture 5
0:00:00 to 0:14:16 - Simultaneous measurability
0:14:17 to 0:27:46 - Review of lecture 4: Evolutions in time review
0:26:36 to 0:52:28 - Review of lecture 4: Commutators
0:52:29 to 1:18:46 - Solving Schrodingers Equation
1:18:47 to 2:03:46 - Application to single spin
This lecture corresponds to the following paragraphs in the Quantum Mechanics - The Theoretical Minimum (2014) book:
0:00:00 5.1.1 States that depend on more than one measurable
0:14:17 Review of lecture 4
0:52:29 4.12 Solving Schrödinger Equation
1:18:47 4.11 Spin in a Magnetic Field
1:38:20 Questions
he's done more for my education than most of my teachers.
Susskind's lectures 4 and 5 have perked up my appetite for a rereading of classical mechanic, a fascinating subject. Dicke and Wittke's quantum mechanics book has an 11-page chapter that just might be right for such review. Thank you, professor Susskind.
He's actually quite a knowledgeable man, Leonard Susskind.
Prof.'s "The Theoretical Minimum" series books are a good source to revise Classical, Quantum and Sp. Relativity concepts.
Important point: Trace of a matrix is sum of its eigenvalues
Determinant of a matrix is product of its eigenvalues.
This is a good summary about eigenvalues: www.adelaide.edu.au/mathslearning/play/seminars/evalue-magic-tricks-handout.pdf
He did covered Poisson brackets extensively in his last lecture course. He is not a douche he is one of the greatest theorists of our day.
I read it a month or two ago. It's all the same stuff that he included in his classical mechanics lecture series, but I felt that it really helped solidify the material for me. If I'm unsure of whether I'm remembering something correctly, it's more convenient to flip open to the chapter, than to try to find the spot in the video where he discussed whatever I need a refresher on. I thought it was quite helpful.
Great insight into probability and why no one knows why it works.
Every time in all his lectures he puts in a cake while pointing his other hand to some complex piece of logic on board , it somehow conveys the message ; ' HEY , THIS EQUATIONS HERE ARE A PIECE OF CAKE TO ME ''.
Brain food
Amazing Series .. can't thank enough !.
Quick question ... What would make an electron jump from a higher energy state to a lower one and in the process emit a photon ? .. i mean .. under what scenario/circumstances would the electron do that ?
I think you can pre-order it, it's called "The Theoretical Minimum: What You Need to Know to Start Doing Physics ".
Sussking does it again! Great lecture!
The last part where he explains what happens with the spin if there is a magnetic field along the z axis is really explanatory. Essencially the last half hour.
New pens! Praise the quantum gods!
If the energy is not always conserved, I mean when Langrangian has an explicit dependence on time, then how does it fit with poisson brackets and commmutators? Because if you use poisson bracket to look how the energy changes, it always doesn't, same with commutators.
Legend Susskind
Questions on related issues.... How are Topology & Measure Theory connected to the orthogonal "l_th Lamder value"???
In Latin : the plural of "apparatus" as noun is : "apparatus" - in the nominative case. The plural of "apparatus" as participle (means : "prepared") is "apparati" - masculine nominative.
en.m.wiktionary.org/wiki/apparatus
New lectures!
@37:00, Heisenberg equation of motion. Much of knowledge overlap with last lecture before @40:00.
Wouldn't it be better if we defined the Poisson brackets as:
{A,B} = lim h->0 (2πi/h)*[B,A] ???
So, it's a 0/0 limit and therefore the left side can exist and be unique.
Where are the new lectures? I'm waiting for lecture 6 and more...
Observing a quantum system is like throwing a cone through a cardboard cone-shaped cut out to see which side it is facing. Of course turning the cardboard 90 degrees will result in rerandomizing future measurements in your initial orientation.
The way quantum deviates, though, is non-perpendicular measurement angles producing probabilities instead of exact values. This seems to indicate that matter and it's antimatter counterpart are part of the complex plane.
WOW! JJJ. You really know your onions!
Schrodinger was more intelligent than me.
I don't even understand this explanation of his work!
Fancy giving a fucking lecture and then fucking eating all the fucking way through it!
I can't hear myself fucking think!
I agree with you and I could listen to him all day, but I also agree that at some points, he arbitrarily chooses to beat some dead horses while letting other live ones run free. Still doesn't make him a douche, though :)
What lectures should I follow after theoretical minimum is finished? Should I follow his lecture on quantam mechanics or Advance Quantum mechanics as both of these are available by him on UA-cam?
Try MIT's Quantum Physics I, II, III on OCW or Edx. I heard they cover about 80% of the quantum physics taught at MIT's PhD program in Physics.
Thankyou
That book is actually mostly classical mechanics.
How now which when
some place u have to fight to survive
Think here
I absolutely love listening to his lectures, but 5 minutes in I'm completely lost every single time.
I like them too. I don’t know why triangles around a circle make the world go round. It’s a way of pondering immeasurable different horizons in immeasurable different ways. It is interesting geometries.
sorry "he did cover Poisson brackets" my first post was ungrammatical.
how come suskidd miss noble prize?
Because of his mostly theoretical contributions to physics which remain to be verified yet
How come the camera operator didn't get an Oscar ?
at 26:20 he is not right... the state always only express probability, even when its an eigenstate. In that particular case the probability is 1. But the system wasn't in that eigenstate before measurement, so the measurement indeed always "disturb" the system.
at first I thought it would be easy, then everything was built up
herrbetto 55 yet still digestible. It’s really a majesterial treatment. I don’t think anywhere else by lecture 5 you’d already be through all the postulates, the empirical behavior of one particle spins, the derivation of the generalized SE, the derivation of heisenbergs transition amplitudes
Did I mention that I bought an iphone 6?
Who'd dislike this?
Qm is easy
Leonard , do you hawe the email . l need talk with you