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import warnings
import numpy as np
import pytest
from numpy.testing import assert_allclose
from einsteinpy.geodesic import Geodesic, Nulllike, Timelike
@pytest.fixture()
def dummy_timegeod():
"""
Equatorial Capture
"""
return Timelike(
metric="Kerr",
metric_params=(0.9,),
position=[2.15, np.pi / 2, 0.],
momentum=[0., 0., 1.5],
steps=50,
delta=0.5,
omega=0.01, # Close orbit
return_cartesian=True,
suppress_warnings=True,
)
@pytest.fixture()
def dummy_nullgeod():
"""
Equatorial Geodesic
"""
return Nulllike(
metric="Kerr",
metric_params=(0.5,),
position=[4., np.pi / 2, 0.],
momentum=[0., 0., 2.],
steps=50,
delta=0.5,
return_cartesian=False,
suppress_warnings=True,
)
def test_str_repr(dummy_timegeod):
geod = dummy_timegeod
assert str(geod) == repr(geod)
def test_NotImplementedError():
try:
geod = Nulllike(
metric="Ker",
metric_params=(0.9,),
position=[2.5, np.pi / 2, 0.],
momentum=[0., 0., -8.5],
)
assert False
except NotImplementedError:
assert True
def test_geodesic_attributes1(dummy_timegeod):
geod = dummy_timegeod
traj = geod.trajectory
assert traj
assert isinstance(traj, tuple)
assert isinstance(traj[0], np.ndarray)
def test_geodesic_attributes2(dummy_timegeod):
geod = dummy_timegeod
traj = geod.trajectory
assert isinstance(traj[1], np.ndarray)
assert traj[0].shape[0] == traj[1].shape[0]
assert traj[1].shape[1] == 8
def test_constant_angular_momentum(dummy_nullgeod):
L = dummy_nullgeod.momentum[-1]
assert_allclose(dummy_nullgeod.trajectory[1][:, -1], L, atol=1e-4, rtol=1e-4)
def test_equatorial_geodesic(dummy_nullgeod):
theta = dummy_nullgeod.position[2]
assert_allclose(dummy_nullgeod.trajectory[1][:, 2], theta, atol=1e-6, rtol=1e-6)
def test_constant_rad():
geod = Timelike(
metric="Kerr",
metric_params=(0.99,),
position=[4., np.pi / 3, 0.],
momentum=[0., 0.767851, 2.],
return_cartesian=False,
steps=50,
delta=1.,
)
r = geod.trajectory[1][:, 1]
assert_allclose(r, 4., atol=1e-2, rtol=1e-2)
def test_kerr0_eq_sch():
metric_params = (0.,)
q0 = [4., np.pi / 2, 0.]
p0 = [0., 0., 0.]
k = Timelike(
metric="Kerr",
metric_params=metric_params,
position=q0,
momentum=p0,
steps=50,
delta=0.5,
return_cartesian=True,
suppress_warnings=True,
)
s = Timelike(
metric="Schwarzschild",
metric_params=metric_params,
position=q0,
momentum=p0,
steps=50,
delta=0.5,
return_cartesian=True,
suppress_warnings=True,
)
assert_allclose(k.trajectory[0], s.trajectory[0], atol=1e-6, rtol=1e-6)
assert_allclose(k.trajectory[1], s.trajectory[1], atol=1e-6, rtol=1e-6)
def test_kerr0_eq_kn00():
metric_params = (0.5, 0.)
q0 = [2.5, np.pi / 2, 0.]
p0 = [0., 0., -8.5]
k = Timelike(
metric="Kerr",
metric_params=metric_params,
position=q0,
momentum=p0,
steps=50,
delta=0.5,
return_cartesian=True,
suppress_warnings=True,
)
kn = Timelike(
metric="KerrNewman",
metric_params=metric_params,
position=q0,
momentum=p0,
steps=50,
delta=0.5,
return_cartesian=True,
suppress_warnings=True,
)
assert_allclose(k.trajectory[0], kn.trajectory[0], atol=1e-6, rtol=1e-6)
assert_allclose(k.trajectory[1], kn.trajectory[1], atol=1e-6, rtol=1e-6)
|
