Dear Experts,(adsbygoogle = window.adsbygoogle || []).push({});

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

**Physics Forums - The Fusion of Science and Community**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Linear Power Spectrum

Loading...

Similar Threads - Linear Power Spectrum | Date |
---|---|

I Comoving mass density leads to linear cosmology? | May 15, 2017 |

I Argument that a maximum density Universe expands linearly | Apr 29, 2017 |

Closed linear cosmology implies G M / R = c^2? | Jul 30, 2013 |

Linear vs non linear matter power spectrum | Apr 28, 2013 |

Simple argument for a linear cosmology | Oct 16, 2012 |

**Physics Forums - The Fusion of Science and Community**