transforming a power spectrum into a correlation function
Posted: January 18 2010
Hi everyone
I am trying since a few days to transform a power spectrum into a correlation function. First I used the software fftlog which is recommended also in this forum. However I didn't get it to work so if anybody has a working example for fftlog I would be interested to see it...
I then implemented a numerical integration by myself which worked out fine (more or less). I have a power law and I can see the BAO peak at 100Mpc. However it is very noisy at large scales. I think I can improve that by using a power spectrum with more data points. I used CAMB to get a matter power spectrum and I can't find out how to increase the data points for this software... so my questions are
1. How can I modify the number of data points in the matter power spectrum output of CAMB
2. Since I am still interested in getting fftlog to work, has anybody implemented this kind of transformation already and can send me an example code?
thank you very much
and best regards
florian
I am trying since a few days to transform a power spectrum into a correlation function. First I used the software fftlog which is recommended also in this forum. However I didn't get it to work so if anybody has a working example for fftlog I would be interested to see it...
I then implemented a numerical integration by myself which worked out fine (more or less). I have a power law and I can see the BAO peak at 100Mpc. However it is very noisy at large scales. I think I can improve that by using a power spectrum with more data points. I used CAMB to get a matter power spectrum and I can't find out how to increase the data points for this software... so my questions are
1. How can I modify the number of data points in the matter power spectrum output of CAMB
2. Since I am still interested in getting fftlog to work, has anybody implemented this kind of transformation already and can send me an example code?
thank you very much
and best regards
florian