Recent content by Zhang Bei

  1. Zhang Bei

    Is there a "critical temperature" for 2D Boson gas?

    The density of states of a 2D gas in a box is g(E)=\frac{Am}{2\pi\hbar^2}\quad. From this we can obtain T=-\frac{2\pi\hbar^2N}{mAk_B\log (1-z)} Inserting z \to 1 gives T_c=0. We conclude that the 2D boson gas doesn't form BEC.However, on the other hand, according to the Bose-Einstein...
  2. Zhang Bei

    I The Commutator of Vector Fields: Explained & Examples

    Hi, I'm just starting to read Wald and I find the notion of the commutator hard to grasp. Is it a computation device or does it have an intuitive geometric meaning? Can anyone give me an example of two non-commutative vector fields? Thanks!
  3. Zhang Bei

    Is 30 Too Old to Start a Career in Particle Physics?

    30 year old software engineer saying hello! I’ve been thinking to go bak to school to learn high energy particle physics in the near future.
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