Explanations on making correction on A_s between linear and non-linear regime
Posted: December 31 2019
Hello,
I take as reference the following link : viewtopic.php?t=475
I would like to understand why one has to to a correction on [math] between the linear and non-linear regime of CAMB.
Actually, in my code, I launch a first time CAMB in linear regime in order to produce 100 files of matter power spectrum ( one [math] 's file for each of the 100 redshifts considered).
Then, I compute [math] from these matter power spectrum : I call this [math].
So, I make the following computation to on [math] and so calculate its new value : [math]
[math] and [math] represent the fiducial/reference values (As far I know, [math] and [math]
After, I launch again CAMB but now, in non-linear regime (with Takabird Halofit model) by using [math].
Finally my question is : why have we got to make this correction on [math] between linear ans non-linear model launching.
Is this for keeping [math] like a parameter of calibration for linear regime ? But this is not [math] which is constant, like for [math], I mean I can't see which quantity remains constant between the 2 CAMB executions (linear and non linear).
If asomeone could explain me what is the goal of this correction on [math] between the 2 runs of CAMB. This would allow me to grasp better the subtilities of the linear and non-linear model.
Kind regards.
I take as reference the following link : viewtopic.php?t=475
I would like to understand why one has to to a correction on [math] between the linear and non-linear regime of CAMB.
Actually, in my code, I launch a first time CAMB in linear regime in order to produce 100 files of matter power spectrum ( one [math] 's file for each of the 100 redshifts considered).
Then, I compute [math] from these matter power spectrum : I call this [math].
So, I make the following computation to on [math] and so calculate its new value : [math]
[math] and [math] represent the fiducial/reference values (As far I know, [math] and [math]
After, I launch again CAMB but now, in non-linear regime (with Takabird Halofit model) by using [math].
Finally my question is : why have we got to make this correction on [math] between linear ans non-linear model launching.
Is this for keeping [math] like a parameter of calibration for linear regime ? But this is not [math] which is constant, like for [math], I mean I can't see which quantity remains constant between the 2 CAMB executions (linear and non linear).
If asomeone could explain me what is the goal of this correction on [math] between the 2 runs of CAMB. This would allow me to grasp better the subtilities of the linear and non-linear model.
Kind regards.