Recent content by roberto85

Apologies Ray, have edited now, appreciate the pointers.

Thanks Ray, i just edited the equation but can't see why its not displaying correctly? edit: i see now, sorry. Is that correct to say then that the covariant multiplied by the contravariant will reduce it to a scalar?

Homework Statement Explain how it is possible to perform a contraction of the tensor ##T^{\beta \gamma}_{\delta \epsilon}## in order to produce a scalar T Homework EquationsThe Attempt at a Solution $$T^{\beta \gamma}_{\delta \epsilon}T_{\beta \gamma}^{\delta \epsilon}=T$$ Not sure if that is...

Homework Statement 1. Explain the difference between a covariant tensor and a contravariant tensor, using the metric tensor as an example. 2. Explain how the components of a general covariant tensor may be converted into those of the equivalent contravariant tensor, and vice versa. Homework...

oh great thanks for letting me know

Yes, he recently posted this paper 6 days ago: http://arxiv.org/abs/1506.08073 I would love for a technical discussion to arise from this paper like it did his last one, it was very interesting.

Hi all, I am looking for some more information about the experiments that Feynman describes during the lectures that he gave in Auckland which can be viewed on the vega science trust website. The first experiment is where photons are transmitted or reflected by one surface with a second similar...

Brilliant, thanyou so much. I expect this pdf will answer more of my questions when i read it more fully.

From wikipedia i have this quote: The fcc value is the highest theoretically possible value for any lattice, although there are other lattices which also achieve the same value, such as hexagonal close packed and one version of tetrahedral bcc What is the tetrahedral BCC which they refer...

Cool, i had read a little about sterile neutrinos and read something about sterile neutrinos possibly being neutral heavy leptons (NHL).. oh i see where this links in with the seesaw mechanism. Okay, I'm not so dismissive of the seesaw mechanism now especially since NHL's might be a good...

Brilliant, thanks for the links.

I was wondering if there was something similar to the 8 fold way representation used on mesons for the fermions?

Yes, to be honest i don't quite like the see saw mechanism of the majorana neutrino theory. But i still think there's something mysterious about neutrinos we have yet to discover, with the weak sector cp violation being the smoking gun. Its on my list of things to keep an eye on ;)

In the above example it would have to be that one of the neutrinos was left handed and the other was right handed, which is what we use to distinguish them as being either a neutrino or an antineutrino respectively. But since a right handed neutrino would, i assume, look and behave exactly the...

I do hope they build some sort of linear collider to investigate the higgs further. Perhaps plans will emerge and become more concrete once more data is accumulated at the LHC. Thanks for the info :)