from .baseconfig import F2003Class, fortran_class
from ctypes import c_bool, c_double, POINTER, byref, c_void_p
[docs]class ReionizationModel(F2003Class):
"""
Abstract base class for reionization models.
"""
_fields_ = [
("Reionization", c_bool, "Is there reionization? (can be off for matter power which is independent of it)")]
[docs]@fortran_class
class TanhReionization(ReionizationModel):
"""
This default (unphysical) tanh x_e parameterization is described in
Appendix B of `arXiv:0804.3865 <https://arxiv.org/abs/0804.3865>`_
"""
_fields_ = [
("use_optical_depth", c_bool, "Whether to use the optical depth or redshift paramters"),
("redshift", c_double, "Reionization redshift if use_optical_depth-False"),
("optical_depth", c_double, "Optical depth if use_optical_depth=True"),
("delta_redshift", c_double, "Duration of reionization"),
("fraction", c_double,
"Reionization fraction when complete, or -1 for full ionization of hydrogen and first ionization of helium."),
("include_helium_fullreion", c_bool, "Whether to include second reionization of helium"),
("helium_redshift", c_double, "Redshift for second reionization of helium"),
("helium_delta_redshift", c_double, "Width in redshift for second reionization of helium"),
("helium_redshiftstart", c_double, "Include second helium reionizatio below this redshift"),
("tau_solve_accuracy_boost", c_double, "Accuracy boosting parameter for solving for z_re from tau"),
("timestep_boost", c_double,
"Accuracy boosting parameter for the minimum number of time sampling steps through reionization"),
("max_redshift", c_double, "Maxmimum redshift allowed when mapping tau into reionization redshift")]
_fortran_class_module_ = 'Reionization'
_fortran_class_name_ = 'TTanhReionization'
_methods_ = [('GetZreFromTau', [c_void_p, POINTER(c_double)], c_double, {"nopass": True})]
[docs] def set_tau(self, tau, delta_redshift=None):
"""
Set the optical depth
:param tau: optical depth
:param delta_redshift: delta z for reionization
:return: self
"""
self.use_optical_depth = True
self.optical_depth = tau
if delta_redshift is not None:
self.delta_redshift = delta_redshift
return self
[docs] def get_zre(self, params, tau=None):
"""
Get the midpoint redshift of reionization.
:param params: :class:`.model.CAMBparams` instance with cosmological parameters
:param tau: if set, calculate the redshift for optical depth tau, otherwise uses curently set parameters
:return: reionization mid-point redshift
"""
if self.use_optical_depth or tau:
from .isitgr import CAMBparams
assert isinstance(params, CAMBparams)
return self.f_GetZreFromTau(byref(params), c_double(tau or self.optical_depth))
else:
return self.redshift