Recent content by skowalcz

I learned special relativity a couple of years ago. I know still (almost) nothing about GR. I'm starting in my fourth year now. Up to now I've been doing both physics and mathematics, so I know already something about curvature, Christoffel symbols, connections etc. Why do I want to learn...

Which book on general relativity is better to start with? "Gravitation" by Misner, Thorne and Wheeler, or "Gravitation and Cosmology" by Weinberg ?

It the previous post I wanted to copy page 8,9 and 10 from this work.. However it didn't work, so you'll have to check the source itself. The result of the calculations is plotted in figure 6, which shows the deviation from the inverse square law. On the vertical axis you have the error. On...

Ok. You are right. I should have said: "The deviations CAN be large already on micrometer scales. It depends on the compactification radius. So yes, what we are doing is exactly: Maybe you are right that what I am talking about is not really what Arkani-Hamed was talking about.. I thought...

No we have no problem. These experiments just place constraints on the radii of the 'large' extra dimensions. Having measured no deviation up to micrometer scales means that the compactification radius < 10^-6 m, but still the possibility exists that for example R=10^-11 m and that we don't know...

No... the deviataions are large already at micrometer scales!

See Griffiths, 'introduction to QM', afterword A4. He calculates the probabilty that a system is still in the excited state after a certain time in which N observations are done. Taking N->infty implies that a continously observed system never decays. If this is really true (no decisive exp...

I wrote an article on this, but ... it's not in english.. :mad: http://gene.science.uva.nl/~skowalcz/scoop_juni2004-18-20-holografie.pdf (Scoop, 06-2004): voor als je nederlands verstaat :wink: And if you don't speak dutch: check out my artist's impression of a black hole!

Indeed, a nice book i already got it. Especially the article on Bertlemann's socks is nice. I learned QM from Griffith's book. Am I wrong that what he teaches is the Copenhagen interpretation? (Ok, in fact the book is not so much about interpretations, but just doing integrals and...

Thanks for the reply. It was quite helpful. 1. There has been no loophole-free experimental test of Bell's inequalities Aspect (in Nature '99 Bell's inequality test: more ideal than ever) on an experiment by Zeilinger et al (1998 Phys. Rev. Let. 81, 5039-5043): "Note that there remains...

Hey I thought people in South africa speak (a kind of ) dutch. Or doesn't it look like dutch at all?

Then you should just copy this link gene.wins.uva.nl/~skowalcz/lightning and paste it in a new window. That works for sure.

I'm just interested in whether I should run to the shop and buy some gum. So is it true or not :frown: Probably not. Otherwise Sportlife would have used this argument that it improves your memory in TV spots all the sime! :biggrin:

I guess so. It is the large current that flows through an object that breaks is. So when you have got an insulator, no current will flow and no damage will be created. By the way, I'm wondering whether this very nice picture of lightning is real. It looks so amazing that I almost can not...

If you ask me, I think this is just the wrong way to do physics. I don't understand how you got your formula.