Recent content by torquil

Could it be due to an accumulation of rounding errors? This can happen when you try to add a lot of very small numbers to a large number. See the first two items in the list on page 2 in this PDF...

Could you please provide references to where you read these statements? Perhaps then it would be easier to help.

Maybe this could be helpful: http://www.feynmanlectures.caltech.edu/III_03.html#Ch3-S1

Here is a definition of compact sets: http://en.wikipedia.org/wiki/Compact_space#Open_cover_definition Please double-check the definition in your book by Rudin. If that does not resolve the issue, please quote the definition here.

That statement is made in eq. 2.1.13, and he comments on it in the sentence that follows. It is just a convention, and depends on how you choose to define the direction of increasing values in the coordinate system. If the direction of increasing values is towards the left, then the terminology...

The quantum state of a system of several particles is described by products of single particle states (and possibly linear combinations thereof). The total colour charge is an additive function of the values from each factor in such a product. So, e.g. a bound state consisting of two gluons with...

The superfluid consists of a superfluid component as well as a normal component. The normal component starts to rotate because it has nonzero viscocity and nonzero friction against the bucket wall. Then the interaction between the normal component and the superfluid component causes the vortices...

This will probably clear it up: http://en.wikipedia.org/wiki/String_field_theory

I don't think that RG-flows are in general reversible in QFT, or that it is unrelated to block spins. Think of the Wilson method of renormalisation by integrating out large wavenumber field configurations to get an effective theory with a lower energy cutoff. That's not an invertible operation.

Yes. Maxwell's equations can be obtained from the principle of stationary action. In the time-independent case, this reduces a minimisation of the energy, for the given boundary conditions.

For static friction, the friction force is of the same magnitude as the force with which you are pushing on the object, but oppositely oriented, so as to exactly keep the object stationary. Since we are talking about static friction, we are assuming that you are pushing with a force not larger...

Nobody knows if the fundamental particles are strings or not. String theory is still very much hypothetical.

To improve our understanding of the laws of nature.

Shouldn't this be in "Beyond the Standard Model"?

But how about the power supply capacity? :smile: