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"I would never die for my beliefs because I might be wrong."

-- Bertrand Russell


Sep
1
comment Would it be possible to develop special relativity without knowing about light?
We are insensitive to most of electromagnetic raditation. In fact, it took us quite some time to realize that visible light is just a manifestation of electromagnetism. Most of the electromagnetic spectrum is detected by specific instrumentation. If that species can develop a science, I don't see any reason why it could not develop those tools. It would only take the realization that some energy is going somewhere they don't "see".
Aug
31
awarded  Nice Answer
Aug
25
comment Is it the act of measuring a quantum particle that causes it to lose its uncertainty?
How will you check that you correctly inferred the location of the particle?
Aug
21
comment Shor's algorithm and Bohmian Mechanics
I didn't realize 't Hooft made a thread here. Is he the real deal? ;P Great, I'm off to read that one!
Aug
16
comment Is dark matter really present around the sun?
Fair enough, I think every statement about dark matter should really be preceded by "we think that..." or "it is hypothesized that...".
Aug
16
comment Is dark matter really present around the sun?
I guess transparent matter would work, it just doesn't sound that ominous. ;)
Aug
16
answered Is dark matter really present around the sun?
Aug
9
comment what is wrong with the following argument about stokes law in compact universes?
I was just going to say that. It's easier to visualize with a closed curve on the surface of a sphere, thus dividing it in two regions. You have to determine an orientation along which to integrate over the curve and if you mean to enclose the other region, then the orientation w.r.t. to your previous choice must reverse.
Aug
7
comment Why is the probability that Kip could go back and kill his grandfather $10^{-10^{60}}$?
I don't know the detailed calculation. I suspect it can be found in "Gravitation" by Wheeler, Thorne and Misner. It must be based on the instability of wormholes. Wormholes have a very short lifetime and thus a probability must be associated with that lifetime.
Aug
7
revised Why is the probability that Kip could go back and kill his grandfather $10^{-10^{60}}$?
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Aug
7
comment On Bell's Inequality (Classical Intuition) and Quantum Mechanical Counter Intuition
It doesn't take care of it, since the local hidden variable theory leads to Bell inequalities which are incompatible with QM. Still don't see your point.
Aug
7
comment Why is the probability that Kip could go back and kill his grandfather $10^{-10^{60}}$?
Yes, but I think the point is that Hawking is envisioning time travel through a wormhole. That's the theory he's relying on. Thus, I suspect the probability is related to the probability of creating a stable wormhole capable of sending Kip Thorne back in time. Which would be a very low probability indeed.
Aug
7
comment Why is the probability that Kip could go back and kill his grandfather $10^{-10^{60}}$?
It must be based on some particular theory for the process that would take Kip back in time. I don't have my copy of "The Universe in a Nutshell" at hand, can you maybe quote the full paragraph in which the statement is made?
Aug
7
revised On Bell's Inequality (Classical Intuition) and Quantum Mechanical Counter Intuition
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Aug
7
comment On Bell's Inequality (Classical Intuition) and Quantum Mechanical Counter Intuition
I don't understand your question. Common sense intuition -- whatever that means but you seem to say Bell's inequality is what it means-- tells us that QM is wrong. Experiment tells us that common sense intuition is wrong. Science tells us that experiment is the arbiter here.
Jul
27
comment Why aren't we Boltzmann brains in an infinite universe?
I think this is philosophy more than physics. There's no physical answer other than: the most sensible hypothesis is that we are not Boltzman brains. And to then work from there.
Jul
16
comment How can I stand on the ground? EM or/and Pauli?
@ChrisGerig: I'm willing to concede your point. I'm no expert on the matter. But I can understand a reasoned argument, so please, instead of posting comments on a message that's nearly one year old, why don't you try to formulate your own reply with the necessary references? You're free to downvote my answer if it displeases you.
Jul
2
comment Is space unending?
The surface of the Earth has no boundaries, yet it is finite. Infinite and unbounded are different concepts.
Jun
29
revised Second Law of Thermodynamics, heat and quantum-level explanation
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Jun
29
answered Second Law of Thermodynamics, heat and quantum-level explanation