CAMB-code: neutrino and quint perturbations
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- Posts: 30
- Joined: March 11 2013
- Affiliation: University Heidelberg
CAMB-code: neutrino and quint perturbations
Hello Antony,
as I wrote a few weeks ago, I want to implement this paper
http://arxiv.org/abs/astro-ph/0512367
in the Camb-Code.
I have some questions about the perturbations in CAMB:
neutrino perturbations in Nu_Integrate_L012:
- for the delt_press of the neutrinos I have an additional term, where I need the Integral without the perturbations of the Fermi-Dirac-distribution.
As far as I understood it now I just can use this nu_int_kernel(iq) (in subroutine Nu_Integrate_L012) or pert_scale and multiply it with v**n (n any order) without multiplying it with y(ind +x), which is the perturbation of the distr. function.
Am I right, that
- clxq corresponds to delta_phi?
- k*psi_prime*Z corresponds to 1/2*h_dot*phi_dot?
martina
as I wrote a few weeks ago, I want to implement this paper
http://arxiv.org/abs/astro-ph/0512367
in the Camb-Code.
I have some questions about the perturbations in CAMB:
neutrino perturbations in Nu_Integrate_L012:
- for the delt_press of the neutrinos I have an additional term, where I need the Integral without the perturbations of the Fermi-Dirac-distribution.
As far as I understood it now I just can use this nu_int_kernel(iq) (in subroutine Nu_Integrate_L012) or pert_scale and multiply it with v**n (n any order) without multiplying it with y(ind +x), which is the perturbation of the distr. function.
Am I right, that
- clxq corresponds to delta_phi?
- k*psi_prime*Z corresponds to 1/2*h_dot*phi_dot?
martina
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- Posts: 30
- Joined: March 11 2013
- Affiliation: University Heidelberg
CAMB-code: neutrino and quint perturbations
I have another question:
why are the pressure perturbations not included in
the subroutine MassiveNuVars?
They are not added to the pressure of the neutrinos there...
why are the pressure perturbations not included in
the subroutine MassiveNuVars?
They are not added to the pressure of the neutrinos there...
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- Posts: 30
- Joined: March 11 2013
- Affiliation: University Heidelberg
CAMB-code: neutrino and quint perturbations
As far as I see it now,the pressure pertubations are neglected in these Massive_Nu_Vasr(Out), i.e. as soon as the neutrinos are massive.
Would be happy for any comment of somebody who knows this...
martina
Would be happy for any comment of somebody who knows this...
martina
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- Posts: 1943
- Joined: September 23 2004
- Affiliation: University of Sussex
- Contact:
Re: CAMB-code: neutrino and quint perturbations
The total pressure perturbation is not needed (basically because it doesn't enter into the Poisson equation, only \delta\rho).
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- Posts: 30
- Joined: March 11 2013
- Affiliation: University Heidelberg
CAMB-code: neutrino and quint perturbations
Thanks!
But it is calculated. Can I use it in the way it is calculated is it right like this? As far as I see - Yes.
To which order of v can I use these Kernel values of the integration
for other additional terms, that I want to add, to get a good approximation? In the papers that I found there was no delimiter for this w of v^w. But I guess there must be a limit where it starts not to be a good approximation any more.
Martina
But it is calculated. Can I use it in the way it is calculated is it right like this? As far as I see - Yes.
To which order of v can I use these Kernel values of the integration
for other additional terms, that I want to add, to get a good approximation? In the papers that I found there was no delimiter for this w of v^w. But I guess there must be a limit where it starts not to be a good approximation any more.
Martina
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- Posts: 30
- Joined: March 11 2013
- Affiliation: University Heidelberg
CAMB-code: neutrino and quint perturbations
the order of v is given by the apprix. scheme n=(-4,-2,...2) and the muliplication with nu right?
In the multiplication I get the q^n where n should be inside this scheme....
In the multiplication I get the q^n where n should be inside this scheme....