Well, I don't really have a strong opinion on that. But there are claims that backreaction effects could mimic accelerated expansion (see Buchert, for instance) and standard N-body simulations suppress these effects by construction. So that's why I think it would be nice to check that in fully...
Hi,
as you all know, current cosmological N-body simulations (like the Millenium run) are based on the Newtonian limit. Gravitational fields are supposed to be rather weak and therefore the force between dark matter particles reduces to Newtonian gravity. Other relativistic effects are...
You are absolutely right, they are well-definied in terms of \phi and the momentum conjugate \pi. What I meant with "there form is unspecified" was that they are functions of \phi , \pi and then again depend on the properties of the field operators.
What about my questions 2) and 3)? And...
Hi all,
I have quite basic questions about the general properties of operators in quantum field theory. When quantizing the free scalar field, for instance, you promote the classical fields to operators and impose suitable commutation relations (canonical quantization). In momentum space the...