Scalar Factor¶
-
einsteinpy.utils.scalar_factor.
scalar_factor
(t, era='md', tuning_param=1.0)[source]¶ Acceleration of the universe in cosmological models of Robertson Walker Flat Universe.
- Parameters
era (string) – Can be chosen from ‘md’ (Matter Dominant), ‘rd’ (Radiation Dominant) and ‘ded’ (Dark Energy Dominant)
t (s) – Time for the event
tuning_param (float, optional) – Unit scaling factor, defaults to 1
- Returns
Value of scalar factor at time t.
- Return type
:raises ValueError : If era is not ‘md’ , ‘rd’, and ‘ded’.:
-
einsteinpy.utils.scalar_factor.
scalar_factor_derivative
(t, era='md', tuning_param=1.0)[source]¶ Derivative of acceleration of the universe in cosmological models of Robertson Walker Flat Universe.
- Parameters
era (string) – Can be chosen from ‘md’ (Matter Dominant), ‘rd’ (Radiation Dominant) and ‘ded’ (Dark Energy Dominant)
t (s) – Time for the event
tuning_param (float, optional) – Unit scaling factor, defaults to 1
- Returns
Value of derivative of scalar factor at time t.
- Return type
:raises ValueError : If era is not ‘md’ , ‘rd’, and ‘ded’.: