Cosmology | Lecture 4

[1isaacmusic]

" Pee and rho are not the same things " hahahaha

[aqouby]

Deepak Chopera doesn't like this.

[karlwashere123]

@aqouby He is this!

[aqouby]

@karlwashere123 lol, uh....

[telephas1c]

@aqouby Probably skipped to the next chapter where Lenny describes how to cure diseases by blasting dark matter out your eyeballs. Quantum, baby.

[CaptainImpedance]

We are moving toward the Virgo Cluster. Blackholes with a mass of 10 to the 25th power grams has a Temperature of about 2.7 Kelvins!!!

[CaptainImpedance]

We are moving toward the Virgo Cluster.

[agapitoflores001]

This is as educational as other videos from StanfordUniversity Channel.

[TheGuyWhoToldMeToTel]

So I'm confused. If dark energy density is constant while the volume is growing, doesn't that violate the law of energy conservation (i.e. new energy is being created in order to keep the energy-volume ration constant while the volume increases with time)? Are there any possible explanations for this? Am I missing something obvious?

[1isaacmusic]

Dear professor Susskind, markers that appear to have run dry can be enlivened by grasping the marker and shaking with the tip held pointing away from you. This will drive the ink that's left in the cartridge to run towards the tip so you can use it longer. Thankfully, F=ma, I learned this from you. :P

[1isaacmusic]

I'd love to hear his opinion about the Eddington-Dirac number, and Dirac's Large Number Hypothesis. I love these lectures he gives. Thank you Stanford and Lennie !!!! Wooooooooooooooooooooooot

[Rotorzilla]

What is Prof Susskind always eating?

[1isaacmusic]

@Rotorzilla Cookies ,lol.

[Rotorzilla]

@1isaacmusic LOL yeah but is favorite ones

[csmcmillion]

@Rotorzilla Cookies. All great theoretical physicists eat cookies during lectures.

[TrollDicked]

This series is better than toking a skiff...lol.

[BigMTBrain]

@1:27:15 - Hmm. So much for the "big rip" theory. I'm surprised that no one questioned Susskind about this.

[BigMTBrain]

Ok. I just read the Wikipedia article on the "Big Rip" and it appears that the authors do indicate that their theory assumes a w = -1.5, which they indicate is improbable. They further state that where (w + 1) approaches 0, a Big Rip is impossible. So, what Susskind explains is in agreement with this, and the Big Rip is merely an amusing theory. Strangely though, most of the quality science programs I've seen present this as more than just fantasy, but a real possibility. Hmm. Bad science.

[badnewswade]

I wish those little dorks would shut up and stop interrupting!

[philosophicalleo405]

Susskind teaching cosmology, testing conformity?

Delivering hypothetical constants in order to make mathematical abstractions appear tangible?

Make data agree with points of scientific dogma by factoring equations designed specifically to hide facts anomalous to a cannon of thought.

Comparing sensory inputs under meditation all principles will become apparent. The Nomenclature to describe these principles is best described using or condensed or vocal imagery, possibly dance, not mathematics.

[JmSantos78]

@philosophicalleo405 What do you mean?

[philosophicalleo405]

@JmSantos78

This lecture is based on errors by design, Susskind the wizard, is testing to see who can/will best attempt to prove his terminally flawed mathmatics using opaque formulae making 1 +1 appear to = 0 or 3 to the lazy, Its a KIND of MAGIC.

If the parts are contained within the hole, then mathmatics is a clumbsy and redundant tool to use when talking in terms of cosmology, Dance and meditation may offer an enthusiast more insight.

Been using your space suit JM? Rofl jokes man

[bunkmasterflex]

@JmSantos78 I think and i am just taking a stab in the dark, That he means the theoretical mathematics are really needless and only give the lecture a slightly more factual feel. Although i would hate to judge maybe they are just a cure for a career of fielding unneeded questions based upon mistrust of what one cannot see

[foketesz]

Furthermore, it's very hard to calculate the correct quantities from inside the system. We are, after all, accelerated observers who don't fully know our own acceleration. There could be background radiation that escaped long ago from the surface of last scattering, and so we assume that the age of the universe is what it is based on insufficient data.

[foketesz]

I don't like this extra dark material and strange properties of the scaling "constants". It reminds me of the ether.I'd rather look for imperfections in the maths. Pi, for example, is always at error, and we see it multiplied by 8 here. The need for constants and extra sources of mass and energy could be the result of misunderstanding the way the various fields combine and aggregate.

[SinclairNicholas]

@foketesz

I was thinking the same thing, that just as scientists invented "cosmic ether" because they did not understand or had not yet discovered Einstein's relativity theories, now we may have "dark matter" because we do not understand and have not discovered the correct theory that makes dark matter unnecessary to invent.

[pw3uk]

How does his theory @ 8:00 differ from the Steady State Theory of Bondi, Gold & Hoyle, 1948?

[pw3uk]

Ok, I think it's answered. He's adding space, not matter.

[foketesz]

sounds like ether

[pw3uk]

Exactly! :-/

[lex1059]

These are really awesome lectures.Has Prof.Susskind written a book that I could get to review these lectures?

[foketesz]

yes! search in amazon

[Broelie77]

I cant thank u enough for posting these videos, great stuff! keep it up =D