Sean M Carroll on Origin of the Universe & the Arrow of Time

[floydstinkyboy]

errata : chart @ 4:04 - there's only 86,400 seconds in a day.

[krash332]

cool shirt!

[freshair101]

his series great courses "dark matter, dark energy" is excellent

[smkipus]

Gingers are funny looking and stupid sounding =)

[SantaOfNeretva]

(...) and entropy.

[SantaOfNeretva]

Sean C. is really excellent lecturer, I love his lectures on the subject of time.

[iTurnedBlue]

oh shit, I just realized this speech was in my university back when I was in first year. I was only a few buildings away when this lecture happened! And I missed it -.-

[JACOESHMT]

@iTurnedBlue you didnt miss much, just a bunch of bolony

[JACOESHMT]

big bang...come on what happened to logic?

[whysers]

@JACOESHMT What do you mean?

[JACOESHMT]

@whysers to have a big bang you need time to exist before the event

[Typho0n86]

Yeah i hate when people say that space and time began at the big bang, it is obiously wrong, Just because our current theorys cant handel it doesnt mean it should stop then. I believe in infinity

[shsulax]

great lecture. horrible shirt

[Redfingers]

@shsulax

Shut up you fucking faggot

Fucking fashion fags, Jesus, I hope you all drown

[shsulax]

@Redfingers wow. did daddy touch you too much when you were little? i bet he wore a shirt like that one.

[Redfingers]

@shsulax

I'm wearing a trucker cap and I've got a mullet right now

somebody call the fashion poliiiiiiice

[Typho0n86]

@Redfingers There is no place for Jesus here, he did not exist

[mosnaidei]

@Typho0n86 There is some historical evidence that he did exist. Whether or not he was prophet of 'god' is the myth.

[Typho0n86]

@mosnaidei that evidence is questionable

[alivemo4]

So the low entropy of the early universe is a known unknown.

[Mayokitty7]

He looks like David Mitchell.

[bdogshredder]

@Mayokitty7 AND sounds like him!...weird....

[ChowZeb]

Big Bangs, and Eggs going backwards.... Sounds like a good porno.

[AlanKey86]

When a photon/EM wave expands, does its amplitude increase as well as its wavelength? If not, why not?

[theoneandonlyblue]

@AlanKey86 No. First, the image of a sine wave is not actually representative of a real wave, so although your intuition tells you the amplitude should expand as well, it's just an illusion of the wave imagery. Second, photons aren't waves - they just act like one in some circumstances. Finally, individual photons do not have an amplitude; the amplitude of a wave describes the number of photons traveling in resonance with each other.

[philopolymath]

Wrong...bullshit...get your head out of Einsteins ass.

[TimeEinstein]

ETERNITY IS HERE AND NOW

[WonderBread006]

Don't believe anything this heretic says, all the science you need is in your bibles.

[sfshilo]

@WonderBread006

They see him trollin' they hatin'

[starlight1946]

All people can do is tell what God is by using adjectives and adverbs. Define God.

[AteyKay010]

I like his shirt.

[starlight1946]

These scientist always want to begin at the big bang. Now what if the big bang was a dead star that became a black hole. The black holes suck in everything around them and down it goes and out it goes. Could it be that out it goes becomes a new heaven and a new earth just another big bang.

[arktheball]

@starlight1946 And you complain about special pleading when the religious presume God? Where is your evidence for this? Or are you just inventing any natural explanation you can to avoid even considering the existence of God?

[Poleschs]

38:00 - That patch is 4 mm, I know!

[mrmaticuluos]

Human beings tend to struggle with troubling questions they can't answer. Just as nature abhors a vacuum, so the intellect acts to fill the void. Or to state it differently, it seeks to repair a hole in its system of belief. Does it seem that this man has quite a big hole he's trying to fill?

[arktheball]

@mrmaticuluos Intellect abhors the void for same reason that nature abhors a vacuum. And that is because they arent consistent with our intellectual experience.

[loopghost]

@ 24:20 - Dude going after a booger.

[sbergman27]

37:00 The real mystery surrounding Dark Energy today is not that it exists, but why it is so small. The vacuum energy is 10^60 to 10^120 times the observed value. It's as though some imperfect cancellation of 2 energies is going on.

I'm not sure what the magnitude of DE during inflation would have to have been. But could it be on the order of 10^60? i.e. could inflation be an example of the expansion we would expect to see working from the value of the vacuum energy with nothing countering it?

[arktheball]

@sbergman27 Why are you calling the cancellation imperfect? I know next to nothing about physics even. But isnt it presumptious and possibilty arrogant to think we know enough about what is going on to simply say its imperfect?

[sbergman27]

@arktheball Here's the scoop. Physics is big on symmetries. When the cosmological constant was thought to be 0, that was OK because it was assumed that some equal & opposite effect was cancelling the vacuum energy exactly. A small but non-zero CC is awkward and a mystery. Conceptually, this is similar to the mystery of why slightly more matter than antimatter was produced in the BB, resulting in the matter we see today, rather then no matter at all. Both are major questions requiring resolution.

[sbergman27]

@arktheball Oh. I should have read a bit more before wasting my time responding to you. I see you're a religious nut crashing this thread to push your religious agenda. I normally don't bother responding to that lot.

[arktheball]

@sbergman27 First I was like cool someones actually taking the time to try and educate me, then you said this end I was like OH another ignorant moron who assumes things of another simply because he/she think they know what I believe

[sbergman27]

If you are not interested in pushing a religious agenda, then talk about physics instead of off-topic crap like your post to starlight1946. I don't care about your religious beliefs. You can worship the Great Green Arkleseizure and flee from handkerchiefs for all I care. Just don't clutter up physics threads with metaphysical drivel. If you want to talk about the CC then talk about the CC.

[kayakbruce1]

@sbergman27 Religion is an incurable mental illness.

[arktheball]

@sbergman27 Fine, just dont expect me to sit here and watch your hypocritical and asinine attitude. You wanna talk about pushing agendas? why dont you scope some ignorant moron like this guy kayakbruce1 with his anti religious agenda with your condescending judgments of superiority? And as for CC, I already TOLD you in my first post, I know VERY little about physics period. I AM willing to learn however when ever you get off your knee high high horse and actually educate. That doesnt mean....

[arktheball]

@sbergman27 That I am incapable of drawing conclusions from what I DO know, and from what you tell me. And if you dont like my conclusions.. well thats kinda YOUR problem isnt it? And for that matter why do you even give a crap about my comment to starlight1946? I was responding to his conclusions which were faulty, not the scientific information in stars post! More to the point, I was responding to his, well it coulda been, mighta been, had to be anything other than God stance!

[sbergman27]

@arktheball Please calm yourself before you have a brain hemorrhage. I've already explained the very interesting & exciting situation re: Dark Energy, Vacuum Energy, the Cosmological constant... whatever you want to call it. Despite your protestations, you don't seem to have any genuine interest. Science rests upon the axiom that the Universe operates according to consistent laws. Deities, whether extant or not, are irrelevant in that venue, as are you comments here. Physics is the topic here.