CAMB Quintessence perturbations
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- Posts: 30
- Joined: March 11 2013
- Affiliation: University Heidelberg
CAMB Quintessence perturbations
Dear Anthony,
I want to change the perturbations of the scalar field coupled to mass varying neutrinos according to the paper:
http://arxiv.org/pdf/astro-ph/0512367v3.pdf
Right now I am not clear about what Your perturbation variable for the field is, where there is a "delta_phi".
Is the perturbation equation related to the Klein-Gordon equation?
If yes: how to I come from the Klein-Gordon equation to Your perturbation of the scalar field.
I would be really happy for any help,
Martina
I want to change the perturbations of the scalar field coupled to mass varying neutrinos according to the paper:
http://arxiv.org/pdf/astro-ph/0512367v3.pdf
Right now I am not clear about what Your perturbation variable for the field is, where there is a "delta_phi".
Is the perturbation equation related to the Klein-Gordon equation?
If yes: how to I come from the Klein-Gordon equation to Your perturbation of the scalar field.
I would be really happy for any help,
Martina
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- Posts: 1941
- Joined: September 23 2004
- Affiliation: University of Sussex
- Contact:
Re: CAMB Quintessence perturbations
In equations_quint.f90 for quintessence, the perturbation variable is clxq (and vq for its derivative)
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- Posts: 30
- Joined: March 11 2013
- Affiliation: University Heidelberg
CAMB Quintessence perturbations
Thanks!
This I know, but why do You use the derivative of phi as a perturbation variable and not delta_phi? This confuses me...
This I know, but why do You use the derivative of phi as a perturbation variable and not delta_phi? This confuses me...
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- Posts: 30
- Joined: March 11 2013
- Affiliation: University Heidelberg
CAMB Quintessence perturbations
ok, what I see right now:
when You have a delta_psi You have a spatial derivative as well.
So are You perturbing in:
psi + SD_a psi ?
this sounds good the longer I think about it...
when You have a delta_psi You have a spatial derivative as well.
So are You perturbing in:
psi + SD_a psi ?
this sounds good the longer I think about it...
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- Posts: 30
- Joined: March 11 2013
- Affiliation: University Heidelberg
CAMB Quintessence perturbations
Right now I read chapter 6 of Your thesis.
I have some questions:
- in chapter 6.9 Your describe the single-field inflation and it seems to me that this is the same as for the quintessence model of Your CAMB notes of Okt. 2013, is this right?
- how do I fix to the zero-acceleration frame (the CDM frame)?
- how do I get this equation (6.94) of Your thesis?
Is there a possibility to read this somewhere else?
I have some questions:
- in chapter 6.9 Your describe the single-field inflation and it seems to me that this is the same as for the quintessence model of Your CAMB notes of Okt. 2013, is this right?
- how do I fix to the zero-acceleration frame (the CDM frame)?
- how do I get this equation (6.94) of Your thesis?
Is there a possibility to read this somewhere else?
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- Posts: 34
- Joined: October 05 2013
- Affiliation: Sogang univ.
CAMB Quintessence perturbations
Hi?
where can one get the thesis that you just mentioned?
-Gansukh
where can one get the thesis that you just mentioned?
-Gansukh
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- Posts: 30
- Joined: March 11 2013
- Affiliation: University Heidelberg
CAMB Quintessence perturbations
at his homepage:
http://cosmologist.info/
in the almost very end on the right:
"download a Postscript copy."
http://cosmologist.info/
in the almost very end on the right:
"download a Postscript copy."
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- Joined: September 23 2004
- Affiliation: University of Sussex
- Contact:
Re: CAMB Quintessence perturbations
There must be much better (and prior) references than my thesis!
There may be some useful references in astro-ph/0307104. In my notation the CDM frame corresponding to setting the acceleration A=0. The CAMB notes also has some relevant description for CAMB.
There may be some useful references in astro-ph/0307104. In my notation the CDM frame corresponding to setting the acceleration A=0. The CAMB notes also has some relevant description for CAMB.