I have two questions about Quintessence module in CAMB.
1) What is the sence of constant "norm" which equals 1d-122 in function Vofphi(phi,deriv) in the code?
2) Why in this "sigma model" Vofphi= norm*exp(-sqrt(3/2)*phi), although according to correct conformal transformation Vofphi \sim exp(-sqrt(2/3)*phi)? I studied paper "f(R) gravity" Antonio De Felice and Shinji Tsujikawa.
Quintessence module
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- Posts: 13
- Joined: July 25 2013
- Affiliation: ROE at University of Edinburgh
Quintessence module
The correct value of norm is
norm = 3*CP%h0**2/c**2*1000**2
This is for it to match the normalization for the other components (matter, radiation) given by the variable grhom.
Example,
omegab = grhom*CP%omegav
Try with a constant potential
Vofphi = norm*CP%omegav
norm = 3*CP%h0**2/c**2*1000**2
This is for it to match the normalization for the other components (matter, radiation) given by the variable grhom.
Example,
omegab = grhom*CP%omegav
Try with a constant potential
Vofphi = norm*CP%omegav