RSS 2.0 Feed

» Welcome Guest Log In :: Register

Pages: (16) < [1] 2 3 4 5 6 ... >   
  Topic: The Finest in Geocentric Models and Analysis, by Ghost of Paley< Next Oldest | Next Newest >  
creeky belly



Posts: 205
Joined: June 2006

(Permalink) Posted: July 20 2006,15:58   

On page 99 of Quantum Physics (Gasiorowicz):

The Hamiltonian is invariant under displacements of 'a' (the period)

E = hbar^2*k^2/2m

Here, the periodicity of the universe is around 300 Mpc (homogeneity), tell me how you apply any sort of band structure when the perodicity of the universe so large.  Take your time. Even in natural units, comparing this to an insulator/conductor makes no sense. Particularly when the value of a increases (and E), the band structure is non-existant (using the approximation <sigma-x> << a). If you need assistance with the math, I'm always here to help.

  
  456 replies since May 31 2006,08:16 < Next Oldest | Next Newest >  

Pages: (16) < [1] 2 3 4 5 6 ... >   


Track this topic Email this topic Print this topic

[ Read the Board Rules ] | [Useful Links] | [Evolving Designs]