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| bio | website | ratsauce.co.uk |
|---|---|---|
| location | Chester, United Kingdom | |
| age | 52 | |
| visits | member for | 2 years, 4 months |
| seen | 9 hours ago | |
| stats | profile views | 3,093 |
Semi retired old time computer nerd who started programming on a Commodore Pet.
Since I'm also active in the Physics forum I should add that I started as a theoretical chemist, moved into solid state photochemistry and finally worked in industry as a colloid scientist. I only became a full time computer nerd in 1997.
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May 5 |
revised |
What is a sudden singularity? Add footnote |
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May 5 |
comment |
What is a sudden singularity? Ah yes. See also arxiv.org/abs/hep-th/0501025. This paper seems to be referenced a lot in discussions of sudden singularities. |
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May 5 |
comment |
What is a sudden singularity? @BenCrowell: if a physics student were asking the question I'd agree, but for a non-physicist I haven't found any description of a sudden singularity (apart from mine of course :-) that is remotely accessible. |
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May 5 |
comment |
What is a sudden singularity? Hmm, good point. I've only heard the phrase used to refer to Big Rip type singularities, but maybe a Big Crunch would also be sudden singularity. |
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May 5 |
answered | Physical explanation for why total internal reflection occurs |
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May 5 |
comment |
What is a sudden singularity? Why the downvote? This seems to me a perfectly reasonable question. |
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May 5 |
answered | What is a sudden singularity? |
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May 5 |
answered | How is the distance to a $\gamma \mathrm{-ray}$ burst (GRB) measured in just a few days? |
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May 4 |
answered | What counts as “observation” in Schrödinger's Cat, and why are superpositions possible? |
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May 4 |
revised |
Why Quantum Mechanics as a non-fundamental effective theory? Correct typo |
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May 4 |
comment |
Bound State of Only Massless Particles? Follows a Time-Like Trajectory? It would take infinite energy to separate the gluons to infinity, so you can't break the bound state. It is this property of the strong force, i.e. confinement, that allows the massless gluons to be bound. In practice as you increased the separation the energy would create more gluons and quarks, and you'd get a couple of jets of hadrons not separated gluons. |
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May 4 |
answered | Why Quantum Mechanics as a non-fundamental effective theory? |
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May 4 |
answered | Charging Glass Rods |
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May 4 |
answered | How can we detect a black hole? |
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May 4 |
answered | Bound State of Only Massless Particles? Follows a Time-Like Trajectory? |
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May 3 |
answered | Are gravitational time dilation and the time dilation in special relativity independent? |
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May 1 |
comment |
In the Lennard-Jones potential, why does the attractive part (dispersion) have an $r^{-6}$ dependence? The $r^{-6}$ comes from the London dispersion force (en.wikipedia.org/wiki/London_dispersion_force) and the derivation of this is complicated. Googling for "derivation of london dispersion force" finds several promising looking articles, but they won't be easy reading! |
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May 1 |
comment |
How fair is it to say that all chemistry arises from failures of the ideal gas law? If by non-ideal you mean everything except ideal gases then yes I agree, but the point is then a rather facile one. To me non-ideal is to ideal much as PPN is to Newtonian gravity i.e. different but recognisably derived from. |
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May 1 |
comment |
How do I determine the location of a free particle with Schrödinger's equation? @PeterKravchuk: your answer is better than the article I linked! +1 :-) |
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May 1 |
comment |
How do I determine the location of a free particle with Schrödinger's equation? @bitmask: take heart, this is a very common mistake for beginners to QM. Have a look at farside.ph.utexas.edu/teaching/qmech/lectures/node25.html for more info on the maths involved and demonstrations.wolfram.com/EvolutionOfAGaussianWavePacket for an animation. |
