Down Rodeo
Cap'n Moth of the Firehouse


2007 Oct 19 • 5404
57,583 ₧

Actually, someone showed me that the other day, It is very interesting. I give a little into the moment like I'm standing at the edge (I know)
That no-one's gonna turn me 'round
Just one more step, I could let go

SRAW
Rocket Man

2007 Nov 6 • 2376
601 ₧

How does the stuff even move through each other??

Down Rodeo
Cap'n Moth of the Firehouse


2007 Oct 19 • 5404
57,583 ₧

Eh, you kind of have to assume that the sphere's material can pass through itself. No singularities though! I give a little into the moment like I'm standing at the edge (I know)
That no-one's gonna turn me 'round
Just one more step, I could let go

SuperJer
Websiteman

2005 Mar 20 • 3883

It can move through itself because it is a mathematical object, not a physical one.

Or it is made of awesome little nanobots.

the_cloud_system
polly pushy pants

2008 Aug 1 • 2971
-6 ₧

a black hole is sead to suck things up.

hawking brought up the discussion of "where does it go"

sense matter can not get destroyed or created, only converted.

your opinion? Samuel adams, always the white choice.

Rockbomb
Dog fucker (but in a good way now)

2009 Nov 13 • 2026

What do you mean "where does it go"?
I thought a black hole was just a huge ammount of mass in a relatively small space. Due to the mass the black hole has large amounts of gravitational pull, and when it 'sucks' stuff in the object is compacted and added to the black hole.

That was my understandings anyway.

the_cloud_system
polly pushy pants

2008 Aug 1 • 2971
-6 ₧

so it is to condense to make another big bang? Samuel adams, always the white choice.

SRAW
Rocket Man

2007 Nov 6 • 2376
601 ₧

Big bang is not really an explosion, but stuff from teh sup0r atom expanding creating space (liek wtf)

The dudes who made the big bang theory really suck, since they don't even explain what was before it.

SRAW
Rocket Man

2007 Nov 6 • 2376
601 ₧

and black hole is just what rockbomb said, it's shitloads of mass in a small area, so there is a strong gravitation pull and not even light can escape it (which means light must have mass!)

Down Rodeo
Cap'n Moth of the Firehouse


2007 Oct 19 • 5404
57,583 ₧

Light's massless, actually, but is affected by gravity. Einstein thought of it as... it's like travelling in a straight line, but in four dimensions, which are curved. Bit complicated.

The thing that Hawking was talking about was the discovery that black holes radiate energy, therefore lose mass over time. Currently there appears to be information loss which Quantum Theory doesn't like. I give a little into the moment like I'm standing at the edge (I know)
That no-one's gonna turn me 'round
Just one more step, I could let go

sprinkles


2009 Sep 6 • 2545
10 ₧

Didn't he say that the black holes were sucking up information?

Down Rodeo
Cap'n Moth of the Firehouse


2007 Oct 19 • 5404
57,583 ₧

I give a little into the moment like I'm standing at the edge (I know)
That no-one's gonna turn me 'round
Just one more step, I could let go

Rockbomb
Dog fucker (but in a good way now)

2009 Nov 13 • 2026

I love how Sprinkles just jumped in and rephrased the post directly before him in attempts to fit in to the conversation

sprinkles


2009 Sep 6 • 2545
10 ₧

I don't like this new kid. Douche bag.

Down Rodeo
Cap'n Moth of the Firehouse


2007 Oct 19 • 5404
57,583 ₧

The idea is that in QT information is conserved but black holes appear to nom the information, which isn't cool. There's a mistake somewhere - either in QT or our idea of black holes. Pretty exciting times eh?

Still thinking of something interesting to say... I'm staying away from Thermodynamics, it's BORING. I'd do some quantum but I figure either you know the stuff OR it's far too advanced because that's what I was doing for 7 hours today.

EDIT: typo. I give a little into the moment like I'm standing at the edge (I know)
That no-one's gonna turn me 'round
Just one more step, I could let go

Down Rodeo
Cap'n Moth of the Firehouse


2007 Oct 19 • 5404
57,583 ₧

Time for more physics.

Let's say you have a miniature "gun" that fires electrons toward a screen. The gun creates a sort of 'spread' of particles, perhaps best thought of as a Bell Curve, if you guys know what that is. If you don't, it's easy enough to find out, and simple to understand.

So anyway, we're firing them at this screen, and we have this pattern. Then we do something clever: we put a barrier in front of this screen, leaving two small holes in it. What happens now?
If you're thinking "two piles, half the size of the first", you're wrong. Welcome to Quantum Mechanics. I'll make this a bit more clear later. I give a little into the moment like I'm standing at the edge (I know)
That no-one's gonna turn me 'round
Just one more step, I could let go

SuperJer
Websiteman

2005 Mar 20 • 3883

I think you need more description or a diagram or something.

Are we to assume the electrons are fired from the gun, have some chance of either hitting the barrier or passing through one of the two holes, and then hitting the screen?

Also, if I know what you're getting at, shouldn't you be talking about a single electron, or a single electron at a time?

Down Rodeo
Cap'n Moth of the Firehouse


2007 Oct 19 • 5404
57,583 ₧

Yes, I do.

Yeah, diagrams would really help here. But yes.

Don't worry, we'll get there. Though you probably do know.

DIAGRAMS:


As Supers mentioned, there are lots of things you can do with this experiment. So, first of all we don't have the barrier, fire lots of electrons, and we end up with a pile of electrons that peaks in the middle. Then, we fire the electrons one at a time, ending up with the same distribution. We set it to fire lots again, and put the barrier in the way. There is a different pattern. What is it?

If we change the gun so that it fires the electrons such that only one is passing through the slit at a time, what happens? I give a little into the moment like I'm standing at the edge (I know)
That no-one's gonna turn me 'round
Just one more step, I could let go

Mate de Vita
Kelli

2008 Oct 4 • 2429
159 ₧

Damn it, while trying to get what Quantum mechanics was about I accidentally found this:


Would it look something like the second picture? ...and that's the bottom line because Mate de Vita said so.

Who controls the past, controls the future. Who controls the present, controls the past.

Down Rodeo
Cap'n Moth of the Firehouse


2007 Oct 19 • 5404
57,583 ₧

Yeah, that's correct :)

What happens if we reduce the "firing rate" such that only one electron is travelling through the slits at a time?
I give a little into the moment like I'm standing at the edge (I know)
That no-one's gonna turn me 'round
Just one more step, I could let go

SuperJer
Websiteman

2005 Mar 20 • 3883

That's a cool picture Mata Va Data. I'd read about this before but hadn't actually seen it.

SuperJer
Websiteman

2005 Mar 20 • 3883

Well the double-slit pattern looks like an interference pattern from the swarm of electrons going through both slits. So with just one electron, I wouldn't expect all the interference.

I wouldn't expect it...

Down Rodeo
Cap'n Moth of the Firehouse


2007 Oct 19 • 5404
57,583 ₧

No, you wouldn't. However, the pattern is still there! Which is part of the mental problems of QM.

However, we are sneaky physicists. We set a detector covering one hole - imagine a detector exactly covering the hole in the image above, between the mask and the screen. What happens now?

(By the way, all the stuff we're talking about so far is experimental. We're not looking at the maths because it's a bit tricky, we'd have to look at a version of the Schrodinger Wave Equation and the wavefunction.) I give a little into the moment like I'm standing at the edge (I know)
That no-one's gonna turn me 'round
Just one more step, I could let go

Mate de Vita
Kelli

2008 Oct 4 • 2429
159 ₧

What kind of a detector? Does it stop the electrons or can they move through it? ...and that's the bottom line because Mate de Vita said so.

Who controls the past, controls the future. Who controls the present, controls the past.

Down Rodeo
Cap'n Moth of the Firehouse


2007 Oct 19 • 5404
57,583 ₧

It doesn't stop them, no. Just records their passing. I give a little into the moment like I'm standing at the edge (I know)
That no-one's gonna turn me 'round
Just one more step, I could let go