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Re: What is Twistor Theory? | Roger Penrose AND What came before Big Bang? Why he changed his mind.

By: De_Composed in GRITZ | Recommend this post (0)
Tue, 10 Jun 25 1:28 AM | 18 view(s)
Boardmark this board | Grits Breakfast of Champeens! 		Msg. 09473 of 09588
(This msg. is a reply to 09470 by Zimbler0)
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Zimbler0:

Re: “With no 'frame of reference' as in no landmarks or anything to check what velocity I'm actually traveling at . . . It would be difficult to prove one way or another.”You surprised me! I thought you would say, "Yes, I'm still moving. I could prove it by hitting the brakes and feeling the car slow as it loses momentum. If I weren't moving, I'd feel nothing." (Okay, so your brakes wouldn't work since there's no road for them to act upon. Humor me.) Or you could turn the car and feel the changing direction.

But what fizzy just said is that inertia is an effect of the universe's mass. If all the mass of the universe was gone, your inertia would be gone too. It would be impossible to prove that you were moving . . . and you may as well not be moving.

While I don't pretend to understand the math that's involved, this does gibe with my understanding too. There might be a relativistic effect. If the universe's mass instantly went away, it would be a very long time before that news and its effect reached you and your car.

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The above is a reply to the following message:
Re: What is Twistor Theory? | Roger Penrose AND What came before Big Bang? Why he changed his mind.
By: Zimbler0 in GRITZ
Tue, 10 Jun 25 12:24 AM 		Msg. 09470 of 09588

>>>
Decomposed > I gave you a hypothetical. IF the universe were to shrink substantially - for whatever reason - God, Gravity, the Honey I Shrunk The Kids gadget, whatever - yet still had its contents including its energy, it would get hot. Shrink it small enough and it would get REALLY hot.
>>>

I don't have a problem with that theory. What I do have a problem with is "What made it shrink?" What is outside the box?

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Decomposed > There is nothing else. And the universe is, as you suppose, infinite. So there's not even an "edge" to one day approach. Are you still moving?
>>>

That reminds me of that old saw "If a tree falls in the forest and there is no one around to hear it - does it still make a noise?"

So, OK. I'm tooling down a highway in Montana at eighty miles per hour and some really ugly space aliens succeed in making everything disappear - except me and my car and somehow somebody managed to install a life support system in my car. Inertia dictates that me and my car will still have that eighty mph we was going when everything disappeared . . . Along with whatever orbital velocity the earth possessed when it got disappeared . . . along with the velocity the solar system possessed and the milky way's velocity etc. etc. etc.

With no 'frame of reference' as in no landmarks or anything to check what velocity I'm actually traveling at . . . It would be difficult to prove one way or another.

Zim.

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