MGrowth

MGrowth is a Python package for computing growth factor and rate in various cosmological scenarios.

Installation

Use the package manager pip to install MGrowth.

pip install MGrowth

Requirements

Required python packages:

• numpy
• scipy

For tutorials:

• matplotlib
• camb
• emcee
• getdist

Running MGrowth

importMGrowthasmgzz= [0.9, 1.2, 1.5, 1.8]
aa=1./(1.+np.array(zz[::-1])) ##should be increasingbackground={'Omega_m':0.31,
'h' :0.74,
'w0': -1.3,
'wa': 0.4,
'a_arr': aa}
cosmo1=mg.LCDM(background)
D, f=cosmo1.growth_parameters()

Available Models

• LCDM: standard cosmological model with fixed $w=-1$
• wCDM: dark energy with constant $w$ which can take any values
• w0waCDM: CPL evolving dark energy$w = w_0 + (1-a)w_a$
• IDE: Interacting Dark Energy also known as dark scattering
• nDGP: normal branch of DGP gravity
• f(R): Hu-Sawicki f(R)
• Linder Gamma: Growth index parametrisation
• Linder Gamma a: Time-dependent growth index

Documentation

Documentation is available here: http://mgrowth.readthedocs.io/