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 Jan 6 answered Energy dispersion in graphene Jan 6 comment Energy dispersion in graphene If I'm not mistaken, there are two carbon atoms per primitive cell, and each has 3 nearest neighbors, so that should be correct. For DoS you need the expression: $g_{2d}(E)=\frac{1}{A}\sum_k\delta(E-E(k))$ if I recall correctly. Then you assume that you have a large volume and go to continuous limit, from sum to integral. Then it's just solving the integral (transform the integral from $k$ to $E$ to integrate and that should be it) Jan 6 comment Energy dispersion in graphene Well you need to draw the crystal structure of graphene, then you can find the unit cell, primitive cell, all the info about Bravais lattice. Then you can see the number of nearest neighbors. For DoS you can search the google density of states for graphene, and 4th pdf has about this. Also look your literature: Kittle, Ashcroft Mermin... graphene is really popular and there is a lot of info on it. Dec 28 comment Really nothing special when falling into a black hole? If I remember correctly the bigger the black hole is, the tidal forces that the body feels are weaker, and the smaller it is they are stronger, but in all reality if you are falling in the black hole you are doomed one way or another :D Dec 28 comment Warped AdS geometry The firs link is forbidden, but I think that the TASI lectures will do. I need a definition what is warped AdS (AdS_3 to be exact), a bit about the symmetries (altho that follows from the symmetries of the AdS_3). The general info. Dec 28 accepted Warped AdS geometry Dec 27 asked Warped AdS geometry Dec 16 comment What is a Nyquist edge? Dec 14 comment Holographic principle and holograms Ok, so technically I'm not wrong XD Dec 14 comment Holographic principle and holograms What interests me is: is it ok to say that we are living in a hologram (Susskind likes to say so if I recall correctly)? In my opinion these two are very different things (holographic principle and holograms). But people think they are somehow connected. Or am I wrong and they really are connected? Dec 14 asked Holographic principle and holograms Nov 26 comment Modular invariance of CFT I'll accept this even tho I'm not really sure how to explain this in layman terms :\ Nov 26 accepted Modular invariance of CFT Nov 25 comment Modular invariance of CFT How could I phrase that in layman terms? XD Is it possible to explaine this to someone who's not directly involved in physics? Or not in this area? Nov 25 asked Modular invariance of CFT Nov 23 comment Question about exterior derivatives I need to add it, I got it after looking a bit :D Thanks :) Nov 23 accepted Question about exterior derivatives Nov 23 revised Question about exterior derivatives added 452 characters in body Nov 22 comment Question about exterior derivatives I will add an edit in my question, since equations won't end up good in comment :\ Nov 22 asked Question about exterior derivatives