def test_event_horizon_for_nonrotating_case():
M = 5e27
a = 0.0
_scr = schwarzschild_radius_dimensionless(M)
a1 = kerr_utils.event_horizon(M, a, np.pi / 4)
a2 = kerr_utils.event_horizon(M, a, np.pi / 4, "Spherical")
assert_allclose(a1, a2, rtol=1e-4, atol=0.0)
assert_allclose(a1[0], _scr, rtol=1e-4, atol=0.0)
def test_event_horizon_for_nonrotating_case():
M = 5e27
a = 0.0
_scr = utils.schwarzschild_radius(M * u.kg).value
a1 = kerr_utils.event_horizon(_scr, a, np.pi / 4)
a2 = kerr_utils.event_horizon(_scr, a, np.pi / 4, "Spherical")
assert_allclose(a1, a2, rtol=0.0, atol=1e-5)
assert_allclose(a1[0], _scr, rtol=0.0, atol=1e-5)
def calculate_trajectory_iterator(
self,
start_lambda=0.0,
stop_on_singularity=True,
OdeMethodKwargs={"stepsize": 1e-3},
return_cartesian=False,
):
"""
Calculate trajectory in manifold according to geodesic equation.
Yields an iterator.
Parameters
----------
start_lambda : float
Starting lambda, defaults to 0.0, (lambda ~= t)
stop_on_singularity : bool
Whether to stop further computation on reaching singularity, defaults to True
OdeMethodKwargs : dict
Kwargs to be supplied to the ODESolver, defaults to {'stepsize': 1e-3}
Dictionary with key 'stepsize' along with an float value is expected.
return_cartesian : bool
True if coordinates and velocities are required in cartesian coordinates(SI units), defaults to Falsed
Yields
------
float
proper time
~numpy.ndarray
array of [t, x1, x2, x3, velocity_of_time, v1, v2, v3] for each proper time(lambda).
"""
ODE = RK45(fun=self.f_vec,
t0=start_lambda,
y0=self.initial_vec,
t_bound=1e300,
**OdeMethodKwargs)
crossed_event_horizon = False
_event_hor = kerr_utils.event_horizon(self.M.value,
self.a.value)[0] * 1.001
while True:
if not return_cartesian:
yield ODE.t, ODE.y
else:
v = ODE.y
si_vals = BoyerLindquistConversion(
v[1], v[2], v[3], v[5], v[6], v[7],
self.a.value).convert_cartesian()
yield ODE.t, np.hstack((v[0], si_vals[:3], v[4], si_vals[3:]))
ODE.step()
if (not crossed_event_horizon) and (ODE.y[1] <= _event_hor):
warnings.warn("particle reached event horizon. ",
RuntimeWarning)
if stop_on_singularity:
break
else:
crossed_event_horizon = True
def calculate_trajectory(
self,
start_lambda=0.0,
end_lambda=10.0,
stop_on_singularity=True,
OdeMethodKwargs={"stepsize": 1e-3},
return_cartesian=False,
):
"""
Calculate trajectory in manifold according to geodesic equation
Parameters
----------
start_lambda : float
Starting lambda(proper time), defaults to 0, (lambda ~= t)
end_lamdba : float
Lambda(proper time) where iteartions will stop, defaults to 100000
stop_on_singularity : bool
Whether to stop further computation on reaching singularity, defaults to True
OdeMethodKwargs : dict
Kwargs to be supplied to the ODESolver, defaults to {'stepsize': 1e-3}
Dictionary with key 'stepsize' along with an float value is expected.
return_cartesian : bool
True if coordinates and velocities are required in cartesian coordinates(SI units), defaults to False
Returns
-------
~numpy.ndarray
N-element array containing proper time.
~numpy.ndarray
(n,8) shape array of [t, x1, x2, x3, velocity_of_time, v1, v2, v3] for each proper time(lambda).
"""
vecs = list()
lambdas = list()
crossed_event_horizon = False
ODE = RK45(fun=self.f_vec,
t0=start_lambda,
y0=self.initial_vec,
t_bound=end_lambda,
**OdeMethodKwargs)
_event_hor = kerr_utils.event_horizon(self.M.value,
self.a.value)[0] * 1.001
while ODE.t < end_lambda:
vecs.append(ODE.y)
lambdas.append(ODE.t)
ODE.step()
if (not crossed_event_horizon) and (ODE.y[1] <= _event_hor):
warnings.warn("particle reached event horizon. ",
RuntimeWarning)
if stop_on_singularity:
break
else:
crossed_event_horizon = True
vecs, lambdas = np.array(vecs), np.array(lambdas)
if not return_cartesian:
return lambdas, vecs
else:
cart_vecs = list()
for v in vecs:
si_vals = BoyerLindquistConversion(
v[1], v[2], v[3], v[5], v[6], v[7],
self.a.value).convert_cartesian()
cart_vecs.append(
np.hstack((v[0], si_vals[:3], v[4], si_vals[3:])))
return lambdas, np.array(cart_vecs)
M = 4e30
scr = schwarzschild_radius(M * u.kg).value
# for nearly maximally rotating black hole
a1 = 0.499999 * scr
# for ordinary black hole
a2 = 0.3 * scr
# In[ ]:
ergo1, ergo2, hori1, hori2 = list(), list(), list(), list()
thetas = np.linspace(0, np.pi, 720)
for t in thetas:
ergo1.append(kerr_utils.radius_ergosphere(M, a1, t, "Spherical"))
ergo2.append(kerr_utils.radius_ergosphere(M, a2, t, "Spherical"))
hori1.append(kerr_utils.event_horizon(M, a1, t, "Spherical"))
hori2.append(kerr_utils.event_horizon(M, a2, t, "Spherical"))
ergo1, ergo2, hori1, hori2 = np.array(ergo1), np.array(ergo2), np.array(
hori1), np.array(hori2)
# In[ ]:
Xe1, Ye1 = ergo1[:, 0] * np.sin(ergo1[:, 1]), ergo1[:, 0] * np.cos(ergo1[:, 1])
Xh1, Yh1 = hori1[:, 0] * np.sin(hori1[:, 1]), hori1[:, 0] * np.cos(hori1[:, 1])
Xe2, Ye2 = ergo2[:, 0] * np.sin(ergo2[:, 1]), ergo2[:, 0] * np.cos(ergo2[:, 1])
Xh2, Yh2 = hori2[:, 0] * np.sin(hori2[:, 1]), hori2[:, 0] * np.cos(hori2[:, 1])
# In[ ]:
Xe1
def calculate_trajectory_iterator(
self,
start_lambda=0.0,
stop_on_singularity=True,
OdeMethodKwargs={"stepsize": 1e-3},
return_cartesian=False,
):
"""
Calculate trajectory in manifold according to geodesic equation
Yields an iterator
Parameters
----------
start_lambda : float
Starting lambda, defaults to 0.0, (lambda ~= t)
stop_on_singularity : bool
Whether to stop further computation on reaching singularity, defaults to True
OdeMethodKwargs : dict
Kwargs to be supplied to the ODESolver, defaults to {'stepsize': 1e-3}
Dictionary with key 'stepsize' along with an float value is expected.
return_cartesian : bool
True if coordinates and velocities are required in cartesian coordinates(SI units), defaults to Falsed
Yields
------
tuple
(lambda, (8,) shape ~numpy.array of [t, pos1, pos2, pos3, velocity_of_time, vel1, vel2, vel3])
"""
singularity_reached = False
ODE = RK45(fun=self.f_vec,
t0=start_lambda,
y0=self.initial_vec,
t_bound=1e300,
**OdeMethodKwargs)
_scr = self.schwarzschild_r.value * 1.001
_event_hor = kerr_utils.event_horizon(self.M.value, self.a)[0] * 1.001
def yielder_func():
nonlocal singularity_reached
while True:
if not return_cartesian:
yield (ODE.t, ODE.y)
else:
temp = np.copy(ODE.y)
temp[1:4] = BLToCartesian_pos(ODE.y[1:4], self.a)
temp[5:8] = BLToCartesian_vel(ODE.y[1:4], ODE.y[5:8],
self.a)
yield (ODE.t, temp)
ODE.step()
if (not singularity_reached) and (ODE.y[1] <= _event_hor):
warnings.warn(
"r component of position vector reached event horizon. ",
RuntimeWarning,
)
if stop_on_singularity:
break
else:
singularity_reached = True
if return_cartesian:
self.units_list = [
u.s,
u.m,
u.m,
u.m,
u.one,
u.m / u.s,
u.m / u.s,
u.m / u.s,
]
return yielder_func()
def calculate_trajectory(
self,
start_lambda=0.0,
end_lambda=10.0,
stop_on_singularity=True,
OdeMethodKwargs={"stepsize": 1e-3},
return_cartesian=False,
):
"""
Calculate trajectory in manifold according to geodesic equation
Parameters
----------
start_lambda : float
Starting lambda, defaults to 0.0, (lambda ~= t)
end_lamdba : float
Lambda where iteartions will stop, defaults to 100000
stop_on_singularity : bool
Whether to stop further computation on reaching singularity, defaults to True
OdeMethodKwargs : dict
Kwargs to be supplied to the ODESolver, defaults to {'stepsize': 1e-3}
Dictionary with key 'stepsize' along with an float value is expected.
return_cartesian : bool
True if coordinates and velocities are required in cartesian coordinates(SI units), defaults to False
Returns
-------
tuple
(~numpy.array of lambda, (n,8) shape ~numpy.array of [t, pos1, pos2, pos3, velocity_of_time, vel1, vel2, vel3])
"""
vec_list = list()
lambda_list = list()
singularity_reached = False
ODE = RK45(fun=self.f_vec,
t0=start_lambda,
y0=self.initial_vec,
t_bound=end_lambda,
**OdeMethodKwargs)
_scr = self.schwarzschild_r.value * 1.001
_event_hor = kerr_utils.event_horizon(self.M.value, self.a)[0] * 1.001
while ODE.t < end_lambda:
vec_list.append(ODE.y)
lambda_list.append(ODE.t)
ODE.step()
if (not singularity_reached) and (ODE.y[1] <= _event_hor):
warnings.warn(
"r component of position vector reached event horizon. ",
RuntimeWarning,
)
if stop_on_singularity:
break
else:
singularity_reached = True
def _not_cartesian():
return (np.array(lambda_list), np.array(vec_list))
def _cartesian():
self.units_list = [
u.s,
u.m,
u.m,
u.m,
u.one,
u.m / u.s,
u.m / u.s,
u.m / u.s,
]
return (np.array(lambda_list), BL2C_8dim(np.array(vec_list),
self.a))
choice_dict = {0: _not_cartesian, 1: _cartesian}
return choice_dict[int(return_cartesian)]()
"""
vecs = list()
lambdas = list()
crossed_event_horizon = False
ODE = RK45(
fun=self.f_vec,
t0=start_lambda,
y0=self.initial_vec,
t_bound=end_lambda,
**OdeMethodKwargs
)
<<<<<<< HEAD
_scr = self.schwarzschild_r.value * 1.001
_event_hor = (
kerr_utils.event_horizon(self.schwarzschild_r.value, self.a)[0] * 1.001
)
=======
_event_hor = kerr_utils.event_horizon(self.M.value, self.a.value)[0] * 1.001
>>>>>>> 0e311bec1be2508a28ebd8a3f8b7b944db997269
while ODE.t < end_lambda:
vecs.append(ODE.y)
lambdas.append(ODE.t)
ODE.step()
<<<<<<< HEAD
if (not singularity_reached) and (ODE.y[1] <= _event_hor):
warnings.warn(
"r component of position vector reached event horizon. ",
RuntimeWarning,
