3,240 reputation
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location United Kingdom
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visits member for 3 years, 3 months
seen Apr 11 at 15:49

Have D.Phil in Mathematical Physics from 25 years ago.

I also like to work in the mathematical foundations of Computer Science and AI. I would be interested to find a merger of work in all three areas....

I am currently updating my understanding of mathematics fundamentals (Set Theory, Reverse Mathematics, Mathematical Logic, etc) and looking at non-standard ideas there to see if any might provide a basis for a different framework for understanding Quantum Theory.


Jan
19
awarded  Yearling
Sep
16
awarded  Popular Question
Jan
30
comment From differentials to differential equations
@Guido, Actually your discrete problem looks like a kind of "one way diffusion". I wonder whether modelling it on a Cellular Automata framework would be possible?
Jan
30
answered From differentials to differential equations
Jan
28
comment Deriving group velocity
I have extended this answer to cover some background to the calculation.
Jan
28
revised Deriving group velocity
added 1389 characters in body
Jan
28
comment Does the Banach-Tarski paradox contradict our understanding of nature?
Ron, Does not the Solovay model require assuming the existence of an Inaccessible Cardinal? If (mathematical) physics is to be described better with Solovay, then do you have an interpretation for this Inaccessible object?
Jan
28
answered Deriving group velocity
Jan
19
awarded  Yearling
Jan
8
awarded  Nice Question
Jun
8
awarded  Constituent
Jun
8
awarded  Caucus
Jan
19
awarded  Yearling
Apr
12
comment Can the Big Rip really rip apart an atomic nucleus?
So to summarise this conclusion in terms of the actual question:(1) The Big Rip will happen (up to atom scale at least);(2) Cosmological isotropy assumptions dont make any difference - the basic theory is sound;(3) Nuclear Rip may or may not happen. Is this the "correct picture"?
Apr
12
comment Investigating damped Harmonic Motion in a Spring?
These two questions are obviously linked: physics.stackexchange.com/questions/8402/…
Apr
12
comment Reactionless Drives
"photons have no mass" - some formulae: photon frequency $\omega$, Energy = $\hbar \omega$= pc. So momentum p=$\hbar \omega/c$. One could even associate the "mass" m=p/c = $\hbar \omega/c^2$. Rest mass is zero.
Apr
12
comment Is there an energy density limit in GR?
Here is a scientific discussion of density with SI units and some actual values: en.wikipedia.org/wiki/Density. So the claim that you appear to make that this concept (density - mass density $\rho$) has no invariant or physical or laboratory meaning doesnt make sense to me.
Apr
12
comment What am I doing wrong when I try to make this unit conversion?
@David, I agree with the last sentence. The question (which I cannot answer) is whether George just took the results from figure 3 (presented as they were against actual ground temperatures of around 15C) as the basis of doing the conversion.
Apr
12
comment Is there an energy density limit in GR?
Furthermore it was not John, but you who introduced $T^{00}$ into this question - only to prove that $T^{00}$ was coordinate dependendent and non-invariant. Great! So the original question still stands unanswered.
Apr
12
comment Is there an energy density limit in GR?
@Edward, I did not mention coordinate systems, because I agree they are arbitrary too. The Lab will have a fixed length say. A tensor-coordinate question here is about the range of representations of that length. A physical question would be "can an an object of unlimited length enter and be placed in the lab"? I agree that there are at least two types of questions around here: ones on tensor-coordinate properties, and ones on actual physical properties. The challenge of this question has been to address the phyisical question: I dont think that it is a tutorial on tensors.