Recent content by ophase

In other words, I am wondering about why we need to embed an n dimensional sphere to n+1 dimensional flat space, in order to derive the metric? If the reason is really a simplified mathematical formalism, i can say that it is not getting easier at all by this way.

We very well know how to calculate curvature in gravitation. But this time i just need a physical explanation to this question on my mind: "In order to describe n dimensional space with constant curvature why do we need to go to n+1 dimensional flat space? Why don't we use just n-dimensional...

Sorry, i didn't have time to elaborate formulas at all. But i'll do it in the future, nice sharing. I am not sure of that if R letter of "R-parity" expression comes from the "Rishon value". Is that true? If not what's the origin of the letter R in R-parity?

Different vacuum expectation values (vevs) may disrupt the vacuum stability. One can not choose arbitrary or multiple vevs. that's the reason why some theories (ex:Technicolor) have been discredited. Furthermore, it may effect the naturalness and triviality of your theory.

Superparticles have also the same baryon and lepton numbers of their superpartners. In the middle step we have B=-1/3 and L=0. (minus bcs it's an anti-particle) Yes! Proton decay violates B-L conversation as well as R-parity conversation. B-L conversation is good for low energies. But for high...

For example, according to RPV SUSY model proton should decay via superpartner of s-quark or b-quark which corresponds to bosonic states. https://upload.wikimedia.org/wikipedia/commons/b/b9/Proton_decay_GUT_simple.svg So X maybe these superpartners. But their vertex factors which are...

This lecture is great and maybe helpful for you: http://videolectures.net/cernstudentsummerschool09_dvali_bsm/

I heard that some of mSugra extensions reduce almost 100 free parameters to 5! I wonder what these numbers are and how can one reduce such a huge number to only 5??

How to solve the Free Parameter Problem in SUSY ?? In Standard Model, we have 19 free parameters: me Electron mass 511 keV mμ Muon mass 106 MeV mτ Tauon mass 1.78 GeV mu Up quark mass () 1.9 MeV md Down quark mass () 4.4 MeV ms Strange quark mass () 87 MeV mc Charm quark mass...

Ok, i edited it.. I think it's more clear now... Since english is not my native language, these happens. Sorry

@hamster143 If one have a discrete symmetry and Noether theorem can't be applicable how can one find out the conserved quantity? @genneth In the classification of symmetries, I never heard of a branch called real symmetries. Can you give us a more detailed definition of Real...

@malawi_glenn So I must say; "Lagrangian is invariant under a Local U(1)-gauge transformations because of charge symmetry" Do you mean that there's no concept called gauge symmetry?? or they mean another thing when they are talking about gauge symmetry?? Is it wrong to say "Charge is...

@malawi_glenn, @Vanadium 50, @clem I should have said that Noether Theorem concerns continuous transformations on the scalar fields. But doesn't it mean that for the discrete symmetries Noether theorem leaves us alone?? After infinitesimal translations to Lagrangian or generalized...

According to Noether Theorem, Every symmetry corresponds to a conversation Law in the nature. For example: If rotational symmetry exits, Angular momentum is conserved. How can I be sure that which symmetry corresponds to which conversation Law? Can you tell me the conversation Laws under...

I think i like the book...Who is the author of that book?? How can i buy it too??