Scalar Factor¶
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einsteinpy.utils.scalar_factor.
scalar_factor
(t, era='md', tuning_param=1.0)¶ 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’.
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einsteinpy.utils.scalar_factor.
scalar_factor_derivative
(t, era='md', tuning_param=1.0)¶ 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’.