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What is the Universe expanding into..
What is the Universe expanding into..
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View Poll Results: Do you think there was anything before the big bang?
I don't think there was anything before the Big Bang 16 8.60%
I think something existed before the Big Bang 73 39.25%
I don't think the big bang happened 23 12.37%
I think the universe is part of a mutiverse 92 49.46%
Multiple Choice Poll. Voters: 186. You may not vote on this poll

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Old 30th June 2020, 09:05 PM   #3131
Galu is offline Galu  Scotland
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Enlarging on Steve's post:

Compton Scattering only occurs between photons and charged particles. It's 'inelastic' meaning that the photon loses energy by transferring it to the charged particle.

Now, according to Harlan Ellison, "The two most common things in the universe are hydrogen and stupidity."

Hot, bright stars split atomic hydrogen into ionic hydrogen i.e. into charged protons and electrons.

This process seeds space with very diffuse ionic hydrogen, making Compton Scattering a possibility.

However, as Steve says, such scattering only applies to X-ray or gamma ray photons - not to photons of visible light.
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Old 30th June 2020, 09:10 PM   #3132
Galu is offline Galu  Scotland
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Quote:
Originally Posted by benb View Post
Teh Void™.
Space is broken, I'm calling a quantum mechanic.
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Old 30th June 2020, 09:13 PM   #3133
system7 is online now system7  United Kingdom
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The reason the photons aren't impeded by loose electrons is they are so much smaller that they just bounce off the heavy electrons unaffected. Like those old 98% superballs we had as kids. It is classical mechanics.

I'm not losing too much sleep over "What the Universe is Expanding into"!

Every direction you look in Space, you look back in time to the Big Bang. The Original Centre, AFAIK.

Nobody has found a way yet to look at the edge.

Which is because the Inner Centre blocks out the view of the Outer Edge, IMO.

I think it's just a question of understanding the Geometry of the whole thing.

I was encouraged by this brilliant virus lockdown proof:
Quanta Magazine

It's got everything I like in Mathematics way beyond my ability.

Simple problem about rectangles on a random smooth closed curve. It's flippin' obvious that you can make a rectangle of any ratio just from looking at it.

But proving it takes us into Toroids, Mobius Strips, Klein bottles, 4 dimensions. And then constraining the solutions into Symplectic Geometry, Kahler Manifolds, Betti numbers and Euler characteristics, and even Galu's pet hate, Gaussian Curvature.

Increasingly I follow my intuition that we live in a special 4 dimensional Doughnut. How it is, IMO. Time will tell.
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Old 30th June 2020, 09:17 PM   #3134
Galu is offline Galu  Scotland
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You're having another giraffe Steve!

There was no centre and there is no edge!
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Old 30th June 2020, 09:22 PM   #3135
Galu is offline Galu  Scotland
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Originally Posted by system7 View Post
I was encouraged by this brilliant virus lockdown proof:
Quanta Magazine
New Geometric Perspective Cracks Old Problem About Rectangles? That's all too much for an old square like me!
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Old 30th June 2020, 09:56 PM   #3136
system7 is online now system7  United Kingdom
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Originally Posted by Galu View Post
New Geometric Perspective Cracks Old Problem About Rectangles? That's all too much for an old square like me!
You should be on the Stage, telling Jokes, not in Physics and Mathematics.

Are you telling me you digested this in 9 minutes?

Quanta Magazine

TBH, I thought that was one of the most excellent pieces of Mathematics I have seen in years. And spent two days on it, whilst researching some more complex aspects. The original paper is way beyond my pay grade.

But every serious class needs a Comedian. Stops us taking it too seriously.
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Old 30th June 2020, 10:00 PM   #3137
Galu is offline Galu  Scotland
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You should be on the Stage, telling Jokes, not in Physics and Mathematics.
I've had a long career on the stage - sweeping it!
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Old 30th June 2020, 10:25 PM   #3138
system7 is online now system7  United Kingdom
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OK, I'll run with it.

Who are the funniest Physicists ever?

Perhaps Sidney Coleman?

YouTube

Terrible haircut, Grouch Marx moustache. Physically awkward. Autistic to the max and liable to *SHOCK*, *HORROR* smoking on Stage.

Never put a foot wrong.

Dick Feynman? 'The Character of Physical Law': Richard Feynman's Legendary Course Presented at Cornell, 1964 | Open Culture

Again, never put a foot wrong.

I admit I am struggling to think of Funny Mathematicians. Maybe David Hilbert. Good hat. And brilliant, of course.
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Old 30th June 2020, 11:30 PM   #3139
system7 is online now system7  United Kingdom
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OMG. One of our Stars has gone Missing!

Mystery over monster star's vanishing act - BBC News

Oh well. I confidently expect to wake up tomorrow. Even minus a Star. We've got Trillions. 'Night everybody.
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Old 1st July 2020, 02:16 PM   #3140
Galu is offline Galu  Scotland
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Originally Posted by system7 View Post
Who are the funniest Physicists ever?

Perhaps Sidney Coleman?

YouTube
Perhaps you could assist me by listing the junctures in this 1hr 32min long lecture at which the jokes appear.

I really can't spare the time to watch it all, what with all the stages I have to sweep today!
 

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