__all__ = ("MuSigmaMG",)
from dataclasses import dataclass
from . import ModifiedGravity
[docs]@dataclass
class MuSigmaMG(ModifiedGravity):
"""The :math:`\\mu`-:math:`\\Sigma` parametrization of modified gravity.
Args:
mu_0 (:obj:`float`): One of the parameters of the
:math:`\\mu`-:math:`\\Sigma`
modified gravity model. Defaults to 0.0
sigma_0 (:obj:`float`): One of the parameters of the
:math:`\\mu`-:math:`\\Sigma`
modified gravity model. Defaults to 0.0
c1_mg (:obj:`float`): MG parameter that enters in the scale
dependence of :math:`\\mu`, affecting its large scale behavior.
Default to 1. See, e.g., Eqs. (46) in
`Ade et al. 2015 <https://arxiv.org/abs/1502.01590>`_,
where their :math:`f_1` and :math:`f_2` functions are set equal
to the commonly used ratio of dark energy density parameter at
scale factor a over the dark energy density parameter today
c2_mg (:obj:`float`): MG parameter that enters in the scale
dependence of :math:`\\Sigma` affecting its large scale behavior.
Default 1. See, e.g., Eqs. (47) in
`Ade et al. 2015 <https://arxiv.org/abs/1502.01590>`_,
where their :math:`f_1` and :math:`f_2` functions are set equal
to the commonly used ratio of dark energy density parameter at
scale factor a over the dark energy density parameter today
lambda_mg (:obj:`float`): MG parameter that sets the start
of dependence on :math:`c_1` and :math:`c_2` MG parameters.
Defaults to 0.0 See, e.g., Eqs. (46) & (47) in
`Ade et al. 2015 <https://arxiv.org/abs/1502.01590>`_,
where their :math:`f_1` and :math:`f_2` functions are set equal
to the commonly used ratio of dark energy density parameter at
scale factor a over the dark energy density parameter today
"""
parametrization: str = "mu_Sigma"
mu_0: float = 0
sigma_0: float = 0
c1_mg: float = 1
c2_mg: float = 1
lambda_mg: float = 0