Lecture 1 of Leonard Susskind’s Modern Physics concentrating on Cosmology. Recorded January 13, 2009 at Stanford University. This Stanford Continuing Studies course is the fifth of a six-quarter sequence of classes exploring the essential theoretical foundations of modern physics. The topics covered in this course focus on classical mechanics. Leonard Susskind is the Felix Bloch Professor of Physics at Stanford University. Stanford University: www.stanford.edu Stanford Continuing Studies …
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{ 25 comments… read them below or add one }
Is Stanford a religious school?
just a point. Space can expand at many times the speed of light (Gutt: Inflation)
Thank you for the wonderful lectures.
-C.L.
Confusing days of the year and degrees in a circle isn’t so stupid. The Babylonians who gave us 360 degrees chose it because that’s very close to the days in the year and thus angle of rotation of the heavens per day and because of course it’s easy to calculate with.
I hope so. I was afraid that my understanding of cosmology would be messed up
j/k
This guy is brilliant
I love to see old men not senile.
for years I have wanted to find something that would explain this stuff adequately to me, using the appropriate maths, explaining it steadily and as simply and clearly whilst not assuming to much prior specialist knowledge.
This series of lectures is just fantastic.
Thank you.
Mr Susskind is a very good lecturer.
Indeed, that would break isotropy.
Learn the basics and come back
It’s ironic – the cosmology class I took was all qualitative despite being a ‘math class’. The homework/exams were all math, none of which was covered in class. Both sides of the coin are interesting, though.
i was kinda looking for something i would understand.. this was a waste of my time.. lol
I mean the universe has no centre in the sense youre implying; you cant wind the motion of the galaxies though 3D space back and find a common point they all flew out of. Theyre all receding from eachother at speed proportional to their distance. Imagine them painted on the surface of a balloon; if youre in a galaxy on the surface you cant get to the centre of the balloon; see? The balloon in this example is 3D and the surface is 2D.
Okaay you’ve completely lost me there… I have no idea what you’re talking about
HA HA HA HA
No that wasnt exactly what I meant. I guess in your scheme I was thinking 5D space; space curved over in 4 spatial dimensions and a 5th time dimesion.
So in 3space everything is receding from everything else, and there isnt a ‘centre’ where the big bang occured. You need to think of the universe as hyperspherical, and if you can do that, visually, youre doing a lot better than I am!
Yep, 3D is space, 4D is space+time (spacetime).
0D=point
1D=line
2D=plane (flat)
3D=planes with dimention (space)
4D=space with dimention (spacetime), i.e. space at different times, history.
I learnt that from another youtube comment, it made so much more sense to me!! =D
id be gay with this guy for 20 bucks
If there were none further out from us, then one hemisphere of the night sky would be devoid of other galaxies, nebulae, etc., and as far as I’m aware, each side is pretty much the same.
This is what the Prof. was saying about the universe not having a centre as far as the galaxies are concerned.
I heard the universe was to a sphere like a sphere is to a circle. Ie a sphere in a 4D space. So all bits are flying apart from a common centre in 4D. Something like that.
Another observation I’ve made is that, man wants to cover up the universe towards the Big Bang. If we consider that our universe is spherical, where does our galaxy fit in this sphere? More towards the inside or more to the outside? If consider that the Big Bang is the core of this sphere of course. Are there any galaxies further out from the Big Bang than ours?
yes, there is a period of time when the space was expanding faster than light.. and as you know, the space expansion is accelerating, and the further the object is, it seems to move faster away, if u approach that to infinite, and u know what u get.
Helped alot thanks, don’t worry about your english, I sure would wish to write as well in spanish as you write in english
This has been measure watching star in neighbour galaxies, but the number of detection does not acccount for all the mass that is necesary to hold the star in a galaxie toghether. So now we pretty much know that dark matters are particles that weakly interact (like neutrinos, but not moving so fast) and not MACHOS in any significant amount.
Sorry if my english is not perfect, I have a hard time even writing in spanish.
Hope that helps
Most of dark matter is particles that gravitates but don’t interact in any other way. Friction doesn’t affect dark matter like affect our own matter, so dark matter does not condense in a small region like thecenter of a galaxie. So the gravity is not much per volume to bend the light or other electromagnetic radiation.
That is “most” of dark matter, there are some jupiter-like and little black holes out there that “CAN” bend the light creating a lensing effect.
Yet we don’t seem to know much about the dark matter and it’s physical carateristics, when I happen to think about it? Can it alter the light and the microwave radiation travelling through it, how can we tell for sure. Your suggestion makes sense if we don’t consider the dark matter at all. I know this sounds like “is there a god?”. Thanks.