Reionization models

class isitgr.reionization.ReionizationModel

Abstract base class for reionization models.

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

class isitgr.reionization.TanhReionization

Bases: isitgr.reionization.ReionizationModel

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)

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)

Set the optical depth

Parameters:

• tau – optical depth
• delta_redshift – delta z for reionization

Returns:

self