- #1
fab13
- 318
- 6
Hi,
I wanted to have a precision about a question that has been post on this relation between P(k) and C_l
The author writes the ##C_\ell## like this :
$$C_\ell(z,z') = \int_0^\infty dkk^2 j_\ell(kz)j_\ell(kz')P(k)$$
I don't undertstand the meaning of ##z## and ##z'## : these are not redshift, are they ?
Normally, it should depend of the multipole ##\ell## but how to make the link between these 2 quantities ##z## and ##z'## and multipole ##\ell##.
Moreover, does the ##P(k)## represent systematically the linear matter power spectrum ? or can we add RSD (Redshift Space Distorsions) like Kaiser or alcock-paczynski effects ?
Thanks for your clarifications and explanations.
Regards
Source https://www.physicsforums.com/threads/relationship-between-the-angular-and-3d-power-spectra.993041/
I wanted to have a precision about a question that has been post on this relation between P(k) and C_l
The author writes the ##C_\ell## like this :
$$C_\ell(z,z') = \int_0^\infty dkk^2 j_\ell(kz)j_\ell(kz')P(k)$$
I don't undertstand the meaning of ##z## and ##z'## : these are not redshift, are they ?
Normally, it should depend of the multipole ##\ell## but how to make the link between these 2 quantities ##z## and ##z'## and multipole ##\ell##.
Moreover, does the ##P(k)## represent systematically the linear matter power spectrum ? or can we add RSD (Redshift Space Distorsions) like Kaiser or alcock-paczynski effects ?
Thanks for your clarifications and explanations.
Regards
Source https://www.physicsforums.com/threads/relationship-between-the-angular-and-3d-power-spectra.993041/