- #1
Madster
- 22
- 0
Dear Experts,
I try to understand power spectra for large scale structure and CMB analyses for my exams.
I constantly find the expression for linear power spectra [itex]P(k) = A\cdot k^{n_s}\cdot T^2(k)[/itex]. I understand that this comes from primodial primodial fluctuations and the tranfer function kind of "evolves" the spectrum to our time.
What I don't understand is the following: Why does the BAO make wiggles? I the correlation function there is only one bump from BAO, as much as I know.
What is the nonlinear power spectrum? Why are the wiggles removed from the plots sometimes in the analyses?
Thank you
I try to understand power spectra for large scale structure and CMB analyses for my exams.
I constantly find the expression for linear power spectra [itex]P(k) = A\cdot k^{n_s}\cdot T^2(k)[/itex]. I understand that this comes from primodial primodial fluctuations and the tranfer function kind of "evolves" the spectrum to our time.
What I don't understand is the following: Why does the BAO make wiggles? I the correlation function there is only one bump from BAO, as much as I know.
What is the nonlinear power spectrum? Why are the wiggles removed from the plots sometimes in the analyses?
Thank you