1.0 January 2019

This is a major new release, with CAMB now configured mainly as a Python package (wrapping modern Fortran for fast numerics). See the example notebook for examples of usage and now comprehensive documentation.

Major new features (in Python and Fortran) include:

• Integrated CAMB sources, for CMB, CMB lensing, lensing convergence, number counts and 21cm including all linear velocity and GR effects; SplinedSourceWindow and GaussianWindow classes for setting SourceWindows array describing additional sources.

• New set_initial_power_function and set_initial_power_table functions to set initial power spectra from arbitrary python function or sampled arrays

• DarkEnergy, InitialPower, NonLinearModel, ReionizationModel and RecombinationModel classes that can be dynamically assigned to CAMBparams object fields.

• Easily switch Dark Energy model between fluid and PPF, and support for setting custom w(z) evolution

• Python command line camb script. Functions to load .ini file settings from python scripts.

Python changes:

• set_cosmology now supports more general exact thetastar as well as H0 and cosmomc_theta.
• read_ini and run_ini functions
• Reworked python-fortran interface using metaclass and decorators, supporting allocatable arrays and class instances and directly import and call of Fortran class methods
• Support multiple CAMBdata result instances, and results object can be called safely in any order (removing most global variables)
• CAMBparams read-only properties for omegam, N_eff, omegab, omegac, omaganu, h
• T_CMB changes handled consistently
• set_params supports options for changing dark energy, initial power and non-linear model classes
• set_params can set CAMBparam members if not already used as an argument (and things like InitPower.ns via an input string)
• Fields support named enumerations, name-length fields for arrays, fortran-compatible boolean and help
  docs include help for field values (auto-generated via metaclass)
• Faster and array versions of various background functions
• SecondOrderPK non-linear model class available from Python
• Optional support for CosmoRec and HyRec RecombinationModel classes (need to compile with them linked)
• Updated BBN model default to Parthenope 2017 as Planck 2018 analysis
• "setup.py make" command to re-build the Fortran library, which also works on Windows if gfortran is installed.

General changes

• Changed CAMBparams parameters to be physical density parameters ombh2, omch3, omnuh2 (+omk)
• Modest speed improvement from using higher order series solutions for background neutrino density combined with linear rather than log spline.
• Uses splined a(t) for perturbation evolution rather than evolving for each perturbation mode; tensor spectrum results now much faster
• More accurate background calculations with partial parallelism
• Finer every-L sampling at L=11-15 (small change in EE). Updated c_l interpolation template.
• min_l and custom source functions now set as parts of CAMBparams
• Account for radiation when setting dark energy density from matter densities and omk
• Smoother default reionization history parameters around helium second reionization
• Use matter temperature evolution from recfast (still harmlessly wrong - as before - from reionization onwards)
• scalarCovCls.dat and _array outputs for lensing potential now deflection angle
• Halofit default updated to HMcode to match Planck 2018 analysis
• Added TAxionEffectiveFluid example specific dark energy class implementation
• high_accuracy_default option removed (is now the default)
• Git repository now uses submodule for forutils

Underlying Fortran changes:

• Fortran 2003 Object-oriented code restructuring; Fortran code structure now closer to the python (see class trees). [this is a breaking change]
• Now requires gfortran 6 or ifort 14 or higher (ifort 18.0.1 or higher recommended)
• Fix for auto-kmax when using lensing from command line