Recombination models

class camb.recombination.RecombinationModel(*args, **kwargs)

Abstract base class for recombination models

Variables:

min_a_evolve_Tm – (float64) minimum scale factor at which to solve matter temperature perturbation if evolving sound speed or ionization fraction perturbations

class camb.recombination.Recfast(*args, **kwargs)

Bases: RecombinationModel

RECFAST recombination model (see recfast source for details).

Variables:

• RECFAST_fudge – (float64)

• RECFAST_fudge_He – (float64)

• RECFAST_Heswitch – (integer)

• RECFAST_Hswitch – (boolean)

• AGauss1 – (float64)

• AGauss2 – (float64)

• zGauss1 – (float64)

• zGauss2 – (float64)

• wGauss1 – (float64)

• wGauss2 – (float64)

class camb.recombination.CosmoRec(*args, **kwargs)

Bases: RecombinationModel

CosmoRec recombination model. To use this, the library must be build with CosmoRec installed and RECOMBINATION_FILES including cosmorec in the Makefile.

CosmoRec must be built with -fPIC added to the compiler flags.

Variables:

• runmode – (integer) Default 0, with diffusion; 1: without diffusion; 2: RECFAST++, 3: RECFAST++ run with correction

• fdm – (float64) Dark matter annihilation efficiency

• accuracy – (float64) 0-normal, 3-most accurate

class camb.recombination.HyRec(*args, **kwargs)

Bases: RecombinationModel

HyRec recombination model. To use this, the library must be build with HyRec installed and RECOMBINATION_FILES including hyrec in the Makefile.

You will need to edit HyRec Makefile to add -fPIC compiler flag to CCFLAG (for gcc), and rename “dtauda_” in history.c to “exported_dtauda”