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visits member for 2 years, 7 months
seen May 25 at 7:53

Mar
24
comment What is the physical significance of dot & cross product of vectors? Why is division not defined for vectors?
Wouldn't tensors be too advanced for a basic college-level physics, though? There's a reason that "garbage" is put in those basic textbooks.
Mar
15
awarded  Editor
Feb
21
comment A change in the gravitational law
The weak gravity is probably the killer. That would mean the Universe would be nothing but an expanding cloud of gas. So no 4D people to play Rubik's Tesseracts :(
Feb
13
awarded  Yearling
Feb
13
comment How does “warp drive” not violate Special Relativity causality constraints?
How do they find that 817 years go by on Earth, if from Earth's point of view they were going FTL, and thus their trip would take less than 8.6 years? If they took 817 years from Earth's point of view, that would mean that from Earth's point of view they were traveling far SLOWER than C.
Feb
13
asked Is it, and if so, why, impossible to build perpetual motion machines (PMMs) in GR?
Jan
1
comment Does the Earth rotate vertically too?
Yeah, I did not see that bit. Sorry.
Jan
1
comment Does the Earth rotate vertically too?
And the Earth turning head-over-heels would not actually produce these effects: the orientation of the magnetic field with respect to the planetary surface would remain unchanged.
Dec
6
comment What does high-pressure ice look like?
Thanks. Wasn't using the right search terms, apparently. Feel free to close this one down if you want.
Dec
6
awarded  Student
Dec
6
asked What does high-pressure ice look like?
Nov
20
comment Will free-fall object into black hole exceed speed of light $c$ before hitting black hole surface?
@Ron Maimon: So if they don't "actually" slow down, does that mean they even pass the horizon? If so, at what speed are they going then?
Nov
18
comment How long would it take to travel through a wormhole?
Do you have a citation on the objection from information loss?
Nov
12
comment Is the universe linear? If so, why?
Let us continue this discussion in chat.
Nov
12
comment Is the universe linear? If so, why?
(Although, it looks likely that quantum computers will be realized, as all the laws of quantum mechanics which suggest their possibility have been tested vigorously through other means, and more and more breakthroughs and improvements keep on coming.)
Nov
12
awarded  Commentator
Nov
12
comment Is the universe linear? If so, why?
That is, it is possible just as much as how it is consistent with the laws of the universe that one can make a starship which can travel at 99.9999% of light speed, although it would be infeasible to actually build such a thing.
Nov
12
comment Is the universe linear? If so, why?
Also, what is "real" quantum computation? Does this mean a quantum computer has to be practical, or just theoretically possible? E.g. what if it is infeasible to build a quantum computer with any more than a small number of qubits for whatever reason, yet still possible in theory?
Nov
12
comment Is the universe linear? If so, why?
@Ron Maimon: And if it does have a "classical" base but requires a crazy amount of bits, what's the problem? All that would seem to mean is that we could not use the "classical" base theory to simulate very much of the universe.
Nov
10
comment Is the universe linear? If so, why?
If "no", then a failure to harness it would not falsify the theory.