Constant (null) potential

class galpy.potential.NullPotential(amp=1.0, ro=None, vo=None)[source]

Class that implements a constant potential with, thus, zero forces. Can be used, for example, for integrating orbits in the absence of forces or for adjusting the value of the total gravitational potential, say, at infinity

__init__(amp=1.0, ro=None, vo=None)[source]

Initialize a null potential: a constant potential with, thus, zero forces

Parameters:

  • amp (float or Quantity, optional) – Constant value of the potential (default: 1); can be a Quantity with units of velocity-squared

  • ro (float, optional) – Distance scale for translation into internal units (default from configuration file)

  • vo (float, optional) – Velocity scale for translation into internal units (default from configuration file)

Notes

  • 2022-03-18 - Written - Bovy (UofT)