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NX01_AnisCoefficients.py
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NX01_AnisCoefficients.py
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"""
Created by stevertaylor
Copyright (c) 2014 Stephen R. Taylor
Code contributions by Rutger van Haasteren (piccard), Justin Ellis (PAL/PAL2), and Chiara Mingarelli.
"""
from __future__ import division
import math
import numpy as np
from math import factorial, sqrt, sin, cos, tan, acos, atan, pi, log
from cmath import exp
import scipy
from scipy.integrate import quad, dblquad
from scipy import special as sp
import random
norm = 3./(8*pi)
c00 = sqrt(4*pi)
def calczeta(phi1, phi2, theta1, theta2):
"""
Calculate the angular separation between position (phi1, theta1) and
(phi2, theta2)
"""
zeta = 0.0
if phi1 == phi2 and theta1 == theta2:
zeta = 0.0
else:
argument = sin(theta1)*sin(theta2)*cos(phi1-phi2) + \
cos(theta1)*cos(theta2)
if argument < -1:
zeta = np.pi
elif argument > 1:
zeta = 0.0
else:
zeta = acos(argument)
return zeta
"""
Following functions taken from Gair et. al (2014),
involving solutions of integrals to define the ORF for an
arbitrarily anisotropic GW background.
"""
def Fminus00(qq, mm,ll,zeta):
integrand = 0.
for ii in range(0,qq+1):
for jj in range(mm,ll+1):
integrand += ( 2.0**(ii-jj) * (-1.)**(qq-ii+jj+mm) ) * \
( factorial(qq)*factorial(ll+jj) * ( 2.0**(qq-ii+jj-mm+1) - (1.0+cos(zeta))**(qq-ii+jj-mm+1) ) ) / \
( factorial(ii)*factorial(qq-ii)*factorial(jj)*factorial(ll-jj)*factorial(jj-mm)*(qq-ii+jj-mm+1) )
return integrand
def Fminus01(qq, mm,ll,zeta):
integrand = 0.
for ii in range(0,qq+1):
for jj in range(mm,ll+1):
integrand += ( 2.0**(ii-jj) * (-1.)**(qq-ii+jj+mm) ) * \
( factorial(qq)*factorial(ll+jj) * ( 2.0**(qq-ii+jj-mm+2) - (1.0+cos(zeta))**(qq-ii+jj-mm+2) ) ) / \
( factorial(ii)*factorial(qq-ii)*factorial(jj)*factorial(ll-jj)*factorial(jj-mm)*(qq-ii+jj-mm+2) )
return integrand
def Fplus01(qq, mm,ll,zeta):
integrand = 0.
for ii in range(0,qq):
for jj in range(mm,ll+1):
integrand += ( 2.0**(ii-jj) * (-1.)**(ll+qq-ii+jj) ) * \
( factorial(qq)*factorial(ll+jj) * ( 2.0**(qq-ii+jj-mm) - (1.0-cos(zeta))**(qq-ii+jj-mm) ) ) / \
( factorial(ii)*factorial(qq-ii)*factorial(jj)*factorial(ll-jj)*factorial(jj-mm)*(qq-ii+jj-mm) )
if mm==ll:
integrand += 0.
else:
for jj in range(mm+1,ll+1):
integrand += ( 2.0**(qq-jj) * (-1.)**(ll+jj) ) * \
( factorial(ll+jj) * ( 2.0**(jj-mm) - (1.0-cos(zeta))**(jj-mm) ) ) / \
( factorial(jj)*factorial(ll-jj)*factorial(jj-mm)*(jj-mm) )
integrand += ( (-1.)**(ll+mm) * 2.0**(qq-mm) * factorial(ll+mm) * log(2./(1.0-cos(zeta))) ) / \
(1.0*factorial(mm)*factorial(ll-mm))
return integrand
def Fplus00(qq, mm,ll,zeta):
integrand = 0.
for ii in range(0,qq+1):
for jj in range(mm,ll+1):
integrand += ( 2.0**(ii-jj) * (-1.)**(ll+qq-ii+jj) ) * \
( factorial(qq)*factorial(ll+jj) * ( 2.0**(qq-ii+jj-mm+1) - (1.0-cos(zeta))**(qq-ii+jj-mm+1) ) ) / \
( factorial(ii)*factorial(qq-ii)*factorial(jj)*factorial(ll-jj)*factorial(jj-mm)*(qq-ii+jj-mm+1) )
return integrand
def arbORF(mm,ll,zeta):
if mm == 0:
if ll>=0 and ll<=2:
delta = [1.0+cos(zeta)/3., -(1.+cos(zeta))/3., 2.0*cos(zeta)/15.]
if zeta==0.:
return norm*0.5*sqrt( (2.0*ll+1.0)*pi ) * \
(delta[ll] - (1.0+cos(zeta))*Fminus00(0, 0,ll,zeta))
else:
return norm*0.5*sqrt( (2.0*ll+1.0)*pi ) * \
(delta[ll] - (1.0+cos(zeta))*Fminus00(0, 0,ll,zeta) - \
(1.0-cos(zeta))*Fplus01(1, 0,ll,zeta))
else:
if zeta==0.:
return norm*0.5*sqrt( (2.0*ll+1.0)*pi ) * \
( - (1.0+cos(zeta))*Fminus00(0, 0,ll,zeta))
else:
return norm*0.5*sqrt( (2.0*ll+1.0)*pi ) * \
( - (1.0+cos(zeta))*Fminus00(0, 0,ll,zeta) - \
(1.0-cos(zeta))*Fplus01(1, 0,ll,zeta))
elif mm == 1:
if ll==1 or ll==2:
delta = [2.0*sin(zeta)/3., -2.0*sin(zeta)/5.]
return norm * 0.25*sqrt( (2.0*ll+1.0)*pi )*sqrt( (1.0*factorial(ll-1))/(1.0*factorial(ll+1)) ) * \
(delta[ll-1] - ( (1.0+cos(zeta))**(3./2.) / (1.0-cos(zeta))**(1./2.) )*Fminus00(1, 1,ll,zeta) - \
( (1.0-cos(zeta))**(3./2.) / (1.0+cos(zeta))**(1./2.) )*Fplus01(2, 1,ll,zeta))
else:
return norm * 0.25*sqrt( (2.0*ll+1.0)*pi )*sqrt( (1.0*factorial(ll-1))/(1.0*factorial(ll+1)) ) * \
( - ( (1.0+cos(zeta))**(3./2.) / (1.0-cos(zeta))**(1./2.) )*Fminus00(1, 1,ll,zeta) - \
( (1.0-cos(zeta))**(3./2.) / (1.0+cos(zeta))**(1./2.) )*Fplus01(2, 1,ll,zeta))
else:
return - norm * 0.25*sqrt( (2.0*ll+1.0)*pi )*sqrt( (1.0*factorial(ll-mm))/(1.0*factorial(ll+mm)) ) * \
( ( (1.0+cos(zeta))**(mm/2. + 1) / (1.0-cos(zeta))**(mm/2.) )*Fminus00(mm, mm,ll,zeta) - \
( (1.0+cos(zeta))**(mm/2.) / (1.0-cos(zeta))**(mm/2. - 1.) )*Fminus01(mm-1, mm,ll,zeta) + \
( (1.0-cos(zeta))**(mm/2. + 1) / (1.0+cos(zeta))**(mm/2.) )*Fplus01(mm+1, mm,ll,zeta) - \
( (1.0-cos(zeta))**(mm/2.) / (1.0+cos(zeta))**(mm/2. - 1.) )*Fplus00(mm, mm,ll,zeta) )
def dlmk(l,m,k,theta1):
"""
returns value of d^l_mk as defined in allen, ottewill 97.
Called by Dlmk
"""
if m >= k:
factor = sqrt(factorial(l-k)*factorial(l+m)/factorial(l+k)/factorial(l-m))
part2 = (cos(theta1/2))**(2*l+k-m)*(-sin(theta1/2))**(m-k)/factorial(m-k)
part3 = sp.hyp2f1(m-l,-k-l,m-k+1,-(tan(theta1/2))**2)
return factor*part2*part3
else:
return (-1)**(m-k) * dlmk(l,k,m,theta1)
def Dlmk(l,m,k,phi1,phi2,theta1,theta2):
"""
returns value of D^l_mk as defined in allen, ottewill 97.
"""
return exp(complex(0.,-m*phi1)) * dlmk(l,m,k,theta1) * \
exp(complex(0.,-k*gamma(phi1,phi2,theta1,theta2)))
def gamma(phi1,phi2,theta1,theta2):
"""
calculate third rotation angle
inputs are angles from 2 pulsars
returns the angle.
"""
if phi1 == phi2 and theta1 == theta2:
gamma = 0
else:
gamma = atan( sin(theta2)*sin(phi2-phi1) / \
(cos(theta1)*sin(theta2)*cos(phi1-phi2) - \
sin(theta1)*cos(theta2)) )
dummy_arg = (cos(gamma)*cos(theta1)*sin(theta2)*cos(phi1-phi2) + \
sin(gamma)*sin(theta2)*sin(phi2-phi1) - \
cos(gamma)*sin(theta1)*cos(theta2))
if dummy_arg >= 0:
return gamma
else:
return pi + gamma
def arbCompFrame_ORF(mm,ll,zeta):
if zeta == 0.:
if ll>2:
return 0.
elif ll==2:
if mm==0:
# pulsar-term doubling
return 2*0.25*norm*(4./3)*(sqrt(pi/5))*cos(zeta)
else:
return 0.
elif ll==1:
if mm==0:
# pulsar-term doubling
return -2*0.5*norm*(sqrt(pi/3.))*(1.0+cos(zeta))
else:
return 0.
elif ll==0:
# pulsar-term doubling
return 2.0*norm*0.25*sqrt(pi*4)*(1+(cos(zeta)/3.))
elif zeta == pi:
if ll>2:
return 0.
elif ll==2 and mm!=0:
return 0.
elif ll==1 and mm!=0:
return 0.
else:
return arbORF(mm,ll,zeta)
else:
return arbORF(mm,ll,zeta)
def rotated_Gamma_ml(m,l,phi1,phi2,theta1,theta2,gamma_ml):
"""
This function takes any gamma in the computational frame and rotates it to the
cosmic frame.
"""
rotated_gamma = 0
for ii in range(2*l+1):
rotated_gamma += Dlmk(l,m,ii-l,phi1,phi2,theta1,theta2).conjugate()*gamma_ml[ii]
return rotated_gamma
def real_rotated_Gammas(m,l,phi1,phi2,theta1,theta2,gamma_ml):
"""
This function returns the real-valued form of the Overlap Reduction Functions,
see Eqs 47 in Mingarelli et al, 2013.
"""
if m>0:
ans=(1./sqrt(2))*(rotated_Gamma_ml(m,l,phi1,phi2,theta1,theta2,gamma_ml) + \
(-1)**m*rotated_Gamma_ml(-m,l,phi1,phi2,theta1,theta2,gamma_ml))
return ans.real
if m==0:
return rotated_Gamma_ml(0,l,phi1,phi2,theta1,theta2,gamma_ml).real
if m<0:
ans=(1./sqrt(2)/complex(0.,1))*(rotated_Gamma_ml(-m,l,phi1,phi2,theta1,theta2,gamma_ml) - \
(-1)**m*rotated_Gamma_ml(m,l,phi1,phi2,theta1,theta2,gamma_ml))
return ans.real
def CorrBasis(psr_locs, lmax):
corr=[]
for ll in range(0,lmax+1):
mmodes = 2*ll+1 # Number of modes for this ll
for mm in range(mmodes):
corr.append(np.zeros((len(psr_locs), len(psr_locs))))
for aa in range(len(psr_locs)):
for bb in range(aa, len(psr_locs)):
rot_Gs=[]
plus_gamma_ml = [] # this will hold the list of gammas
# evaluated at a specific value of phi{1,2}, and theta{1,2}.
neg_gamma_ml = []
gamma_ml = []
# Pre-calculate all the gammas so this gets done only once.
# Need all the values to execute rotation codes.
for mm in range(ll+1):
zeta = calczeta(psr_locs[:,0][aa],psr_locs[:,0][bb],\
psr_locs[:,1][aa],psr_locs[:,1][bb])
intg_gamma = arbCompFrame_ORF(mm,ll,zeta)
# just (-1)^m Gamma_ml since this is in the computational frame
neg_intg_gamma = (-1)**(mm) * intg_gamma
# all of the gammas from Gamma^-m_l --> Gamma ^m_l
plus_gamma_ml.append(intg_gamma)
# get the neg m values via complex conjugates
neg_gamma_ml.append(neg_intg_gamma)
neg_gamma_ml = neg_gamma_ml[1:] # this makes sure we don't have 0 twice
rev_neg_gamma_ml = neg_gamma_ml[::-1] # reverse direction of list, now runs from -m...0
gamma_ml = rev_neg_gamma_ml + plus_gamma_ml
mindex = len(corr) - mmodes
for mm in range(mmodes):
m = mm - ll
corr[mindex+mm][aa, bb] = \
real_rotated_Gammas(m, ll, psr_locs[:,0][aa], psr_locs[:,0][bb],
psr_locs[:,1][aa], psr_locs[:,1][bb], gamma_ml)
if aa != bb:
corr[mindex+mm][bb, aa] = corr[mindex+mm][aa, bb]
return corr