noAxioms

No, ours is 3+1, but the concepts are the same. The coordinate system (all four axes) can still be oriented any way, so long as they stay perpendicula...

Pictures are hard to post. Consider a simple spacetime of 2D, one of space, the other of time. Lots easier to visualize. Twins experiment requires onl...

I meant nothing moves through the block of Minkowski Space time. Time is built in. This is about the block view, not SR or GR. Velocity is the slope o...

Well, in block universe, there is no motion, just worldlines, straight (inertial) or otherwise. The dimensions of those worldlines can be different de...

That seems more like identity than anything with this temporal existence for which you are reaching. 7=7 is pretty pure. But OK, you using 'exists' to...

Have not yet read all the replies to this, but the definition and examples of 'exist' don't seem to match, and I think need to be clarified. The defin...

The problems start right there. Einstein did not propose gravity to propagate at all. Gravity waves, yes, which act as the particle equivalent of exci...

Didn't read it all, but the nature of the proof is pretty obvious in the initial diagram, and yes, it (speed-of-light gravity) would seem to inject en...

No, I mean the force of the "Spaceship engines".

What about the F? Sounds pretty much like a variable to me.

I hear you.

That's right. It has to do with knowing what acceleration is. You're confusing it with velocity. Yes, in the frame of the fast moving ship, Earth has ...

Yes, you should do this. It is covered in 7th grade physics. F=MA or A=F/M which still works even under relativity. The force on Earth is primarily th...

Go through the example, ignoring relativity or not. Does the half-lightspeed pulse generator not take 18 minutes (in Earth frame) to travel 9 light mi...

Same thing. See the example above with the sun. Let's say it flashes 10 times a minute (every 6 seconds). Without relativity, the trip takes 18 minute...

For simplicity, assume it is coming directly at you/directly away. No angles to complicate it. This is Doppler effect, the same reason a train horn pi...

Right. It will flash faster as it approaches and slower after it goes by. This is why Andromeda is blue shifted when we look at it. Relativity says it...

I didn't like the wording of this part. Each clock is dilated slower in the frame of the other, but that cannot be directly observed. They only get on...

Fixing the quote. I didn't say the 'Rich' part above. More or less, yes. I don't think relativity goes into explaining why our universe has this geome...

Completely false. You seem to not understand the distinction between velocity and acceleration.

All true, but again, I was talking about your use of 'acceleration'. In no frame does Earth accelerate beyond its annual wobble around the sun. It wou...

Earth does not accelerate away. That would require a massive force on Earth, sending it out of the solar system. — noAxioms Reciprocity of Special Rel...

If the trip takes 50 years (ship time), they're not exactly expecting to see their relatives again anyway. Human life span is not that long. So why is...

They would die because the gravity, temperature, air mixture, water mixture, or whatever environment they need is probably not what Earth has. Transla...

It's as big as 'here', so of course it fits in the sleigh. All timelord technology anyway. Anybody ever check Santa for a double heartbeat or wonder w...

I suspect the present is about as big as 'here' is in size.

Could be. You need to reply to those who know this subject better than I. I've been a ball of disproven opinions on this point throughout this thread....

A type-1 alternate universe is just like a type-3 in that we might share a common portion of past history, but we can effectively no longer interact, ...

I think the cosmological principle allows such exceptions, but just says that the probability of us being that exception is sufficiently infinitesimal...

Not sure which post brings on this reply. I brought up an insanely complex quantum equation in my prior post, but never suggested it was in need of be...

Let's be rigorous about our definition of the state of a type-1 universe, that with which we would need to have copied. I think all you need is a spec...

I thought you pushed the view that you're married to both of them, a deterministic view. I just now see Michael's edit where he notes the same view sh...

I did in the post to which you replied. Perhaps you think that countable means you can know how many there are, but then the integers are not countabl...

That's why I brought up QM interpretations. Copenhagen is in theory nondeterministic, but involves faster than light action, and thus destroys the lim...

You're being illusive. Wayfarer has a point, and you know the next question. Countable means you can assign a number to any of these volumes, and to d...

Funny, I see them as subtractions. I find them elegant solutions. The unsavory feeling you get seems to be a challenge to a religious view of what you...

I mean the 1m3 expanding to infinity is not going to happen. OK, I worded it ambiguously, and you took it to mean that I'm not going to attempt the ma...

I cannot think of anyone who has put forth a scientific hypothesis that mermaids don't exist. You have a link to such a proposal?

I don't know my cosmology enough to describe the actual workings of our big bang. Inflation theory says there was different physics for a short time, ...

If the model has a event 0, there is no space to have a size. That's what makes it a singularity.

I did. I took the question for sarcasm and responded in kind when you persisted. Not going to happen. Universe was never 1m3 it seems.

You persist with this. Is it a serious question? 6 days, after which enough expansion took place to qualify as infinite. On the 7th day, the expansion...

Another note: Level 3 universes overlap as well. There is amazing symmetry between the level 1 and level 3 concepts. Level 1 is just Schrodinger's box...

The comment here only makes sense if interpreted as sarcasm. It implies that there might have been finite hubble volumes, and after enough time, that ...

Thanks guys. Didn't think it would work. A few holes to point out, but in the end, the state of Earth does not require all the universe to have been t...

I just picked this out. Agree with your post. My history-of-everything assumes no discreetness at all. Any tiny difference way below Planck constant w...

Right. Can count only the finite ones (trivially at that). The coin model works, and thus 1 followed by all zeros is possible. Shot down again. Am sti...

I realized that I had made an error and backed off my 'certainly' claim pending a redo. In the end, I decided that no-Earth was not in sample-space. I...

Speed is distance/time. Velocity is a vector, so it has a directional component. One can accelerate (also a vector quantity) and change velocity witho...

Had a hard time picking out a consistent point being made in that long post, so I picked this little bit out.This sort of makes the assumption that we...