Reionization models¶

class camb.reionization.ReionizationModel(*args, **kwargs)[source]¶

Abstract base class for reionization models.

Variables:: Reionization – (boolean) Is there reionization? (can be off for matter power which is independent of it)

class camb.reionization.TanhReionization(*args, **kwargs)[source]¶

This default (unphysical) tanh x_e parameterization is described in Appendix B of arXiv:0804.3865

Variables:

use_optical_depth – (boolean) Whether to use the optical depth or redshift paramters
redshift – (float64) Reionization redshift if use_optical_depth-False
optical_depth – (float64) Optical depth if use_optical_depth=True
delta_redshift – (float64) Duration of reionization
fraction – (float64) Reionization fraction when complete, or -1 for full ionization of hydrogen and first ionization of helium.
include_helium_fullreion – (boolean) Whether to include second reionization of helium
helium_redshift – (float64) Redshift for second reionization of helium
helium_delta_redshift – (float64) Width in redshift for second reionization of helium
helium_redshiftstart – (float64) Include second helium reionizatio below this redshift
tau_solve_accuracy_boost – (float64) Accuracy boosting parameter for solving for z_re from tau
timestep_boost – (float64) Accuracy boosting parameter for the minimum number of time sampling steps through reionization
max_redshift – (float64) Maxmimum redshift allowed when mapping tau into reionization redshift

get_zre(params, tau=None)[source]¶

Get the midpoint redshift of reionization.

Parameters:

params – model.CAMBparams instance with cosmological parameters
tau – if set, calculate the redshift for optical depth tau, otherwise uses curently set parameters

Returns:

reionization mid-point redshift

set_tau(tau, delta_redshift=None)[source]¶

Set the optical depth

Parameters:

Returns:

self

set_zrei(zrei, delta_redshift=None)[source]¶

Set the mid-point reionization redshift

Parameters:

Returns:

self