Source code for camb.reionization

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 <>`_ """ _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 .camb import CAMBparams assert isinstance(params, CAMBparams) return self.f_GetZreFromTau(byref(params), c_double(tau or self.optical_depth)) else: return self.redshift