Recent content by whynothis

I thought I would add my two sense you the subject of this question. The idea of size makes very little sense when talk about quarks and electrons. The reason is that quarks and electrons are thought to be elementary particles, in other words they contain no other particles. Furthermore it is...

I have read statements which basically suggest that nuetrino oscillation prohibits any strict statement of conservation of lepton number. Is this true or is it possible that nuetrinos produced along with electrons, muons and taus become entangled so that lepton number is still strictly...

Agreed.

Blechman, I am confused on what you said about Z not be responsible for decays. Why is that? I mean couldn't you have, for instance, higgs ---> lepton anti-lepton via a Z?

Thanks for the advice. The expression turned out to be right I just needed to do a little foot work to get it in the same form : ) I am curious to know, however, if you had a more elegant way in mind?

Homework Statement Given a parametric curve, \alpha(t) = (x(t),y(t) ), not necessarily arc length parameterized show that the curvature is given by: k = \frac{x'y'' - y'x''}{|\alpha'|^{3}} Homework Equations As I understand this the curvature is defined from the point of view of...

Right, my appologies. s(t) is the arclength of the curve relative to some point say t=a.

Hello all, I am taking a class on differential geometry and I have run into a problem with the following question: Show that if α is a regular curve, i.e., ||α'(t)|| > 0 for all t ∈ I, then s(t) is an invertible function, i.e., it is one-to-one (Hint: compute s'(t) ). I am not really...

I was just trying to think of a simple relation to find the number of distinct diagrams to a given order within a theory (specifically I am thinking of a \phi^{4} scalar theory). I am reading Tony Zee's book and am working through his "baby problem" where he expands the integral...

Wonderful, thank you very much I will look into that.

Is "destroyed" really a misnomer? When you say "absorbed" I think of a feynman diagrams with an electron and photon coming in and an electron going out. I say it is destroyed. The energy and other defining properties may be conserved but the photon doesn't exist anymore. This seems true from...

I am not sure what you mean when you say "If it were to be different...", Hertyque. It seems to me that the higgs field is required to behave the same for all particles and their corresponding antiparticles. If this were not the case the Lagrangian would not be hermitian. Right?

Hello all I have a fairly specific question that I am hoping someone can answer. I have been doing some reading on a model called the Simplest Higgs (arXiv:hep-ph/0407143), one class of the more general Little Higgs theories. Basically the model adds new physics to the standard model by...

Thanks everyone for the help. I was forgetting about the fact that the determinant of the rotation matrix was 1... oops. Thanks for the further insight ismaili that is very interesting and I will have to look further into your comment.

I am reading through sidney colemans lectures on QFT and I am stuck on what seem to be a silly question: He talks about the fact that the measure used in a calculation should be invariant in order to prove unitarity and later on that operators transform properly. He uses the example of...