meta user
network profile
| bio | website | |
|---|---|---|
| location | ||
| age | ||
| visits | member for | 1 year, 2 months |
| seen | May 21 at 8:18 | |
| stats | profile views | 100 |
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Apr 15 |
asked | Supersymmetry calculations using computer algebra |
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Apr 11 |
comment |
Are the $10^{500}$ different string theories being whittled down? 10^500 is a conservative estimate, the number might be much larger. But even 10^500 is beyond anything imaginable, the whole universe does not contain enough atoms to store 10^500 integers for example, let alone the parameters for 10^500 string models. Also each of those backgrounds potentially has a number of continuous parameters. |
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Apr 10 |
revised |
What is the variation of Gauss-Bonnet term a total derivative of? added 1 characters in body |
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Apr 10 |
comment |
Does the mass point move? Alfred Centauri, yes but it is equally impossible to exactly generate any kind of force, so to me this is as unrealistic as a sudden violent onset of a force at t=0, modelled by a step function. Realistically you will only be able to approximate it by forces that have some non zero time derivative at t=0. |
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Apr 10 |
awarded | Revival |
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Apr 9 |
answered | What is the variation of Gauss-Bonnet term a total derivative of? |
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Apr 9 |
revised |
Does the mass point move? added 159 characters in body |
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Apr 9 |
answered | Does the mass point move? |
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Mar 29 |
comment |
Is space unending? It is possible to describe a sphere intrinsically, without thinking of it as embedded in three dimensional space. Perhaps a better example would be the torus: The game world of some arcade video games like snake has that shape: If you leave the screen on one side, you reappear on the other side. This gives the example of a finite but unbounded two dimensional space. |
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Mar 10 |
awarded | Yearling |
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Dec 19 |
answered | Is there a simple way to compute some physical constant from Feynman diagram statistics? |
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Dec 6 |
answered | Why is the world sheet of an open string a cylinder? |
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Dec 3 |
answered | Why in QFT, do we study the scalar field, when there is no such thing in nature? |
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Nov 30 |
awarded | Caucus |
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Nov 24 |
awarded | Scholar |
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Nov 24 |
accepted | Spectrum of Free Strings |
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Oct 29 |
answered | Is it possible to recover Classical Mechanics from Schrödinger's equation? |
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Oct 10 |
answered | Differences between the gravitational constants $G$ and $g$? |
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Sep 6 |
comment |
Why is the $\langle v_{x}^{2} \rangle=\frac{1}{3} \langle v^2 \rangle$? Generally $\langle A + B \rangle = \langle A \rangle + \langle B \rangle$, this is more or less build into the setup. After all expectation values are computed by evaluating certain sums or integrals. |
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Jul 27 |
comment |
Can physics get rid of the continuum? @RonMaimon You are right, I am not terribly satisfied with my answer myself. The idea I tried to convey was that numerical analysis has been very successful in simulating classical physics, because they deal with differentiable functions, those functions look boring locally and differential equations can therefore be discretized successfully. The "therefore" sweeps the whole field of numerical analysis under the rug and you are right that there are many subtle problems, energy conservation for example. |
