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physics.hpp
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/*
This file is part of CUDAProb3++.
CUDAProb3++ is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
CUDAProb3++ is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with CUDAProb3++. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef CUDAPROB3_PHYSICS_HPP
#define CUDAPROB3_PHYSICS_HPP
#include "constants.hpp"
#include "math.hpp"
#include <string.h>
#include <stdio.h>
//#include <math.h>
//#include <algorithm>
#include <assert.h>
#include <omp.h>
/*
* This file contains the Barger et al physics which are used by Prob3++ to compute oscillation probabilities.
*
* Core function to loop over energys and cosine is function:
*
* template<typename FLOAT_T>
* __host__ __device__
* void calculate(NeutrinoType type, const FLOAT_T* const cosinelist, int n_cosines, const FLOAT_T* const energylist, int n_energies,
* const FLOAT_T* const radii, const FLOAT_T* const rhos, const int* const maxlayers, FLOAT_T ProductionHeightinCentimeter, FLOAT_T* const result)
*
* It can either be called directly on the CPU, or on the GPU via kernel
*
* template<typename FLOAT_T>
* __global__
* void calculateKernel(NeutrinoType type, const FLOAT_T* const cosinelist, int n_cosines, const FLOAT_T* const energylist, int n_energies,
* const FLOAT_T* const radii, const FLOAT_T* const rhos, const int* const maxlayers, FLOAT_T ProductionHeightinCentimeter, FLOAT_T* const result)
*
*
* Both host and device code is combined in function void calculate(..), such that only one function has to be maintained for host and device.
*
*
* Before using function void calculate(..) (or the kernel), neutrino mixing matrix and neutrino mass differences have to be set.
* Use
*
* template<typename FLOAT_T>
* void setMixMatrix(math::ComplexNumber<FLOAT_T>* U);
*
* and
*
* template<typename FLOAT_T>
* void setMassDifferences(FLOAT_T* dm);
*
* before GPU calculation.
*
* Use
*
* template<typename FLOAT_T>
* void setMixMatrix_host(math::ComplexNumber<FLOAT_T>* U);
*
* and
*
* template<typename FLOAT_T>
* void setMassDifferences_host(FLOAT_T* dm);
*
* before CPU calculation.
*
*
*
*
* NVCC macro __CUDA_ARCH__ is used for gpu exclusive code inside __host__ __device__ functions
*
*/
// in device code, we need to access the device global constants instead of host global constants
#ifdef __CUDA_ARCH__
#define U(i,j) ((math::ComplexNumber<FLOAT_T>*)mix_data_device)[( i * 3 + j)]
#define DM(i,j) ((FLOAT_T*)mass_data_device)[( i * 3 + j)]
#define AXFAC(a,b,c,d,e) ((FLOAT_T*)A_X_factor_device)[a * 3 * 3 * 3 * 4 + b * 3 * 3 * 4 + c * 3 * 4 + d * 4 + e]
#define ORDER(i) mass_order_device[i]
#else
#define U(i,j) ((math::ComplexNumber<FLOAT_T>*)mix_data)[( i * 3 + j)]
#define DM(i,j) ((FLOAT_T*)mass_data)[( i * 3 + j)]
#define AXFAC(a,b,c,d,e) ((FLOAT_T*)A_X_factor)[a * 3 * 3 * 3 * 4 + b * 3 * 3 * 4 + c * 3 * 4 + d * 4 + e]
#define ORDER(i) mass_order[i]
#endif
namespace cudaprob3{
namespace physics{
/*
* Constant global data
*/
#ifdef __NVCC__
__constant__ double mix_data_device [9 * sizeof(math::ComplexNumber<double>)] ;
__constant__ double mass_data_device[9];
__constant__ double A_X_factor_device[81 * 4]; //precomputed factors which only depend on the mixing matrix for faster calculation
__constant__ int mass_order_device[3];
#endif
double mix_data [9 * sizeof(math::ComplexNumber<double>)] ;
double mass_data[9];
double A_X_factor[81 * 4]; //precomputed factors for faster calculation
int mass_order[3];
/*
* Set global 3x3 pmns mixing matrix
*/
template<typename FLOAT_T>
void setMixMatrix(math::ComplexNumber<FLOAT_T>* U){
memcpy((FLOAT_T*)mix_data, U, sizeof(math::ComplexNumber<FLOAT_T>) * 9);
//precomputed factors for faster calculation
for (int n=0; n<3; n++) {
for (int m=0; m<3; m++) {
for (int i=0; i<3; i++) {
for (int j=0; j<3; j++) {
AXFAC(n,m,i,j,0) = U[n * 3 + i].re * U[m * 3 + j].re + U[n * 3 + i].im * U[m * 3 + j].im;
AXFAC(n,m,i,j,1) = U[n * 3 + i].re * U[m * 3 + j].im - U[n * 3 + i].im * U[m * 3 + j].re;
AXFAC(n,m,i,j,2) = U[n * 3 + i].im * U[m * 3 + j].im + U[n * 3 + i].re * U[m * 3 + j].re;
AXFAC(n,m,i,j,3) = U[n * 3 + i].im * U[m * 3 + j].re - U[n * 3 + i].re * U[m * 3 + j].im;
}
}
}
}
#ifdef __NVCC__
//copy to constant memory on GPU
cudaMemcpyToSymbol(mix_data_device, U, sizeof(math::ComplexNumber<FLOAT_T>) * 9, 0, H2D); CUERR;
cudaMemcpyToSymbol(A_X_factor_device, A_X_factor, sizeof(FLOAT_T) * 81 * 4, 0, H2D); CUERR;
#endif
}
/*
* Set global 3x3 pmns mixing matrix on host only
*/
template<typename FLOAT_T>
void setMixMatrix_host(math::ComplexNumber<FLOAT_T>* U){
memcpy((FLOAT_T*)mix_data, U, sizeof(math::ComplexNumber<FLOAT_T>) * 9);
//precomputed factors for faster calculation
for (int n=0; n<3; n++) {
for (int m=0; m<3; m++) {
for (int i=0; i<3; i++) {
for (int j=0; j<3; j++) {
AXFAC(n,m,i,j,0) = U[n * 3 + i].re * U[m * 3 + j].re + U[n * 3 + i].im * U[m * 3 + j].im;
AXFAC(n,m,i,j,1) = U[n * 3 + i].re * U[m * 3 + j].im - U[n * 3 + i].im * U[m * 3 + j].re;
AXFAC(n,m,i,j,2) = U[n * 3 + i].im * U[m * 3 + j].im + U[n * 3 + i].re * U[m * 3 + j].re;
AXFAC(n,m,i,j,3) = U[n * 3 + i].im * U[m * 3 + j].re - U[n * 3 + i].re * U[m * 3 + j].im;
}
}
}
}
}
/*
* Set global 3x3 neutrino mass difference matrix
*/
/// \brief set mass differences to constant memory
template<typename FLOAT_T>
void setMassDifferences(FLOAT_T* dm){
memcpy((FLOAT_T*)mass_data, dm, sizeof(FLOAT_T) * 9);
#ifdef __NVCC__
cudaMemcpyToSymbol(mass_data_device, dm, sizeof(FLOAT_T) * 9 , 0, cudaMemcpyHostToDevice); CUERR;
#endif
}
/*
* Set global 3x3 neutrino mass difference matrix on host only
*/
template<typename FLOAT_T>
void setMassDifferences_host(FLOAT_T* dm){
memcpy((FLOAT_T*)mass_data, dm, sizeof(FLOAT_T) * 9);
}
//
template<typename FLOAT_T>
void prepare_getMfast(NeutrinoType type) {
FLOAT_T alphaV, betaV, gammaV, argV, tmpV;
FLOAT_T theta0V, theta1V, theta2V;
FLOAT_T mMatV[3];
/* The strategy to sort out the three roots is to compute the vacuum
* mass the same way as the "matter" masses are computed then to sort
* the results according to the input vacuum masses
*/
alphaV = DM(0,1) + DM(0,2);
betaV = DM(0,1) * DM(0,2);
gammaV = 0.0;
/* Compute the argument of the arc-cosine */
tmpV = alphaV*alphaV-3.0*betaV;
/* Equation (21) */
argV = (2.0*alphaV*alphaV*alphaV-9.0*alphaV*betaV+27.0*gammaV)/
(2.0*sqrt(tmpV*tmpV*tmpV));
if (fabs(argV)>1.0) argV = argV/fabs(argV);
/* These are the three roots the paper refers to */
theta0V = acos(argV)/3.0;
theta1V = theta0V-(2.0*M_PI/3.0);
theta2V = theta0V+(2.0*M_PI/3.0);
mMatV[0] = mMatV[1] = mMatV[2] = -(2.0/3.0)*sqrt(tmpV);
mMatV[0] *= cos(theta0V); mMatV[1] *= cos(theta1V); mMatV[2] *= cos(theta2V);
tmpV = DM(0,0) - alphaV/3.0;
mMatV[0] += tmpV; mMatV[1] += tmpV; mMatV[2] += tmpV;
/* Sort according to which reproduce the vaccum eigenstates */
int order[3];
for (int i=0; i<3; i++) {
tmpV = fabs(DM(i,0)-mMatV[0]);
int k = 0;
for (int j=1; j<3; j++) {
FLOAT_T tmp = fabs(DM(i,0)-mMatV[j]);
if (tmp<tmpV) {
k = j;
tmpV = tmp;
}
}
order[i] = k;
}
memcpy(mass_order, order, sizeof(int) * 3);
#ifdef __NVCC__
cudaMemcpyToSymbol(mass_order_device, order, sizeof(int) * 3, 0, cudaMemcpyHostToDevice); CUERR;
#endif
}
/*
* Return induced neutrino mass difference matrix d_dmMatMat,
* and d_dmMatVac, which is the mass difference matrix between induced masses and vacuum masses
*
* The strategy to sort out the three roots is to compute the vacuum
* mass the same way as the "matter" masses are computed then to sort
* the results according to the input vacuum masses. Subsequently, the "matter" masses
* are calculated, using the found sorting for vacuum masses
*
* In the original implementation the order of vacuum masses is computed for each bin.
* However, the ordering of vacuum masses does only depend on the constant neutrino mixing matrix.
* Thus, the ordering can be precomputed, which is done in prepare_getMfast
*/
template<typename FLOAT_T>
HOSTDEVICEQUALIFIER
void getMfast(const FLOAT_T Enu, const FLOAT_T rho,
const NeutrinoType type,
FLOAT_T d_dmMatMat[][3], FLOAT_T d_dmMatVac[][3]) {
FLOAT_T mMatU[3], mMat[3];
/* Equations (22) fro Barger et.al.*/
const FLOAT_T fac = [&](){
if(type == Antineutrino)
return Constants<FLOAT_T>::tworttwoGf()*Enu*rho;
else
return -Constants<FLOAT_T>::tworttwoGf()*Enu*rho;
}();
const FLOAT_T alpha = fac + DM(0,1) + DM(0,2);
const FLOAT_T beta = DM(0,1)*DM(0,2) +
fac*(DM(0,1)*(1.0 -
U(0,1).re*U(0,1).re -
U(0,1).im*U(0,1).im ) +
DM(0,2)*(1.0-
U(0,2).re*U(0,2).re -
U(0,2).im*U(0,2).im));
const FLOAT_T gamma = fac*DM(0,1)*DM(0,2)*(U(0,0).re * U(0,0).re + U(0,0).im * U(0,0).im);
/* Compute the argument of the arc-cosine */
const FLOAT_T tmp = alpha*alpha-3.0*beta < 0 ? 0 : alpha*alpha-3.0*beta;
/* Equation (21) */
const FLOAT_T argtmp = (2.0*alpha*alpha*alpha-9.0*alpha*beta+27.0*gamma)/
(2.0*sqrt(tmp*tmp*tmp));
const FLOAT_T arg = [&](){
if (fabs(argtmp)>1.0)
return argtmp/fabs(argtmp);
else
return argtmp;
}();
/* These are the three roots the paper refers to */
const FLOAT_T theta0 = acos(arg)/3.0;
const FLOAT_T theta1 = theta0-(2.0*M_PI/3.0);
const FLOAT_T theta2 = theta0+(2.0*M_PI/3.0);
mMatU[0] = -(2.0/3.0)*sqrt(tmp);
mMatU[1] = -(2.0/3.0)*sqrt(tmp);
mMatU[2] = -(2.0/3.0)*sqrt(tmp);
mMatU[0] *= cos(theta0);
mMatU[1] *= cos(theta1);
mMatU[2] *= cos(theta2);
const FLOAT_T tmp2 = DM(0,0) - alpha/3.0;
mMatU[0] += tmp2;
mMatU[1] += tmp2;
mMatU[2] += tmp2;
/* Sort according to which reproduce the vaccum eigenstates */
UNROLLQUALIFIER
for (int i=0; i<3; i++) {
mMat[i] = mMatU[ORDER(i)];
}
UNROLLQUALIFIER
for (int i=0; i<3; i++) {
UNROLLQUALIFIER
for (int j=0; j<3; j++) {
d_dmMatMat[i][j] = mMat[i] - mMat[j];
d_dmMatVac[i][j] = mMat[i] - DM(j,0);
}
}
}
/*
Calculate the product of Eq. (11)
*/
template<typename FLOAT_T>
HOSTDEVICEQUALIFIER
void get_product(const FLOAT_T L, const FLOAT_T E, const FLOAT_T rho, const FLOAT_T d_dmMatVac[][3], const FLOAT_T d_dmMatMat[][3],
const NeutrinoType type, math::ComplexNumber<FLOAT_T> product[][3][3]){
math::ComplexNumber<FLOAT_T> twoEHmM[3][3][3];
const FLOAT_T fac = [&](){
if(type == Antineutrino)
return Constants<FLOAT_T>::tworttwoGf()*E*rho;
else
return -Constants<FLOAT_T>::tworttwoGf()*E*rho;
}();
/* Calculate the matrix 2EH-M_j */
UNROLLQUALIFIER
for (int n=0; n<3; n++) {
UNROLLQUALIFIER
for (int m=0; m<3; m++) {
twoEHmM[n][m][0].re = -fac*(U(0,n).re*U(0,m).re+U(0,n).im*U(0,m).im);
twoEHmM[n][m][0].im = -fac*(U(0,n).re*U(0,m).im-U(0,n).im*U(0,m).re);
twoEHmM[n][m][1].re = -fac*(U(0,n).re*U(0,m).re+U(0,n).im*U(0,m).im);
twoEHmM[n][m][1].im = -fac*(U(0,n).re*U(0,m).im-U(0,n).im*U(0,m).re);
twoEHmM[n][m][2].re = -fac*(U(0,n).re*U(0,m).re+U(0,n).im*U(0,m).im);
twoEHmM[n][m][2].im = -fac*(U(0,n).re*U(0,m).im-U(0,n).im*U(0,m).re);
}
}
UNROLLQUALIFIER
for (int j=0; j<3; j++){
twoEHmM[0][0][j].re-= d_dmMatVac[j][0];
twoEHmM[1][1][j].re-= d_dmMatVac[j][1];
twoEHmM[2][2][j].re-= d_dmMatVac[j][2];
}
/* Calculate the product in eq.(11) of twoEHmM for j!=k */
//memset(product, 0, 3*3*3*sizeof(math::ComplexNumber<FLOAT_T>));
UNROLLQUALIFIER
for (int i=0; i<3; i++) {
UNROLLQUALIFIER
for (int j=0; j<3; j++) {
UNROLLQUALIFIER
for (int k=0; k<3; k++) {
product[i][j][k].re = 0;
product[i][j][k].im = 0;
}
}
}
UNROLLQUALIFIER
for (int i=0; i<3; i++) {
UNROLLQUALIFIER
for (int j=0; j<3; j++) {
UNROLLQUALIFIER
for (int k=0; k<3; k++) {
product[i][j][0].re +=
twoEHmM[i][k][1].re*twoEHmM[k][j][2].re -
twoEHmM[i][k][1].im*twoEHmM[k][j][2].im;
product[i][j][0].im +=
twoEHmM[i][k][1].re*twoEHmM[k][j][2].im +
twoEHmM[i][k][1].im*twoEHmM[k][j][2].re;
product[i][j][1].re +=
twoEHmM[i][k][2].re*twoEHmM[k][j][0].re -
twoEHmM[i][k][2].im*twoEHmM[k][j][0].im;
product[i][j][1].im +=
twoEHmM[i][k][2].re*twoEHmM[k][j][0].im +
twoEHmM[i][k][2].im*twoEHmM[k][j][0].re;
product[i][j][2].re +=
twoEHmM[i][k][0].re*twoEHmM[k][j][1].re -
twoEHmM[i][k][0].im*twoEHmM[k][j][1].im;
product[i][j][2].im +=
twoEHmM[i][k][0].re*twoEHmM[k][j][1].im +
twoEHmM[i][k][0].im*twoEHmM[k][j][1].re;
}
product[i][j][0].re /= (d_dmMatMat[0][1]*d_dmMatMat[0][2]);
product[i][j][0].im /= (d_dmMatMat[0][1]*d_dmMatMat[0][2]);
product[i][j][1].re /= (d_dmMatMat[1][2]*d_dmMatMat[1][0]);
product[i][j][1].im /= (d_dmMatMat[1][2]*d_dmMatMat[1][0]);
product[i][j][2].re /= (d_dmMatMat[2][0]*d_dmMatMat[2][1]);
product[i][j][2].im /= (d_dmMatMat[2][0]*d_dmMatMat[2][1]);
}
}
}
template<typename FLOAT_T>
HOSTDEVICEQUALIFIER
void getA(const FLOAT_T L, const FLOAT_T E, const FLOAT_T rho, const FLOAT_T d_dmMatVac[][3], const FLOAT_T d_dmMatMat[][3],
const NeutrinoType type, math::ComplexNumber<FLOAT_T> A[3][3], const FLOAT_T phase_offset){
math::ComplexNumber<FLOAT_T> X[3][3];
math::ComplexNumber<FLOAT_T> product[3][3][3];
/* (1/2)*(1/(h_bar*c)) in units of GeV/(eV^2-km) */
const FLOAT_T LoEfac = 2.534;
if (phase_offset == 0.0) {
get_product(L, E, rho, d_dmMatVac, d_dmMatMat, type, product);
}
/* Make the sum with the exponential factor in Eq. (11) */
//memset(X, 0, 3*3*sizeof(math::ComplexNumber<FLOAT_T>));
UNROLLQUALIFIER
for (int i=0; i<3; i++) {
UNROLLQUALIFIER
for (int j=0; j<3; j++) {
X[i][j].re = 0;
X[i][j].im = 0;
}
}
UNROLLQUALIFIER
for (int k=0; k<3; k++) {
const FLOAT_T arg = [&](){
if( k == 2)
return -LoEfac * d_dmMatVac[k][0] * L/E + phase_offset;
else
return -LoEfac * d_dmMatVac[k][0] * L/E;
}();
#ifdef __CUDACC__
FLOAT_T c,s;
sincos(arg, &s, &c);
#else
const FLOAT_T s = sin(arg);
const FLOAT_T c = cos(arg);
#endif
UNROLLQUALIFIER
for (int i=0; i<3; i++) {
UNROLLQUALIFIER
for (int j=0; j<3; j++) {
X[i][j].re += c*product[i][j][k].re - s*product[i][j][k].im;
X[i][j].im += c*product[i][j][k].im + s*product[i][j][k].re;
}
}
}
/* Eq. (10)*/
//memset(A, 0, 3*3*2*sizeof(FLOAT_T));
UNROLLQUALIFIER
for (int n=0; n<3; n++) {
UNROLLQUALIFIER
for (int m=0; m<3; m++) {
A[n][m].re = 0;
A[n][m].im = 0;
}
}
UNROLLQUALIFIER
for (int n=0; n<3; n++) {
UNROLLQUALIFIER
for (int m=0; m<3; m++) {
UNROLLQUALIFIER
for (int i=0; i<3; i++) {
UNROLLQUALIFIER
for (int j=0; j<3; j++) {
// use precomputed factors
A[n][m].re +=
AXFAC(n,m,i,j,0) * X[i][j].re +
AXFAC(n,m,i,j,1) * X[i][j].im;
A[n][m].im +=
AXFAC(n,m,i,j,2) * X[i][j].im +
AXFAC(n,m,i,j,3) * X[i][j].re;
}
}
}
}
}
/*
* Get 3x3 transition amplitude Aout for neutrino with energy E travelling Len kilometers through matter of constant density rho
*/
template<typename FLOAT_T>
HOSTDEVICEQUALIFIER
void get_transition_matrix(const NeutrinoType type, const FLOAT_T Enu, const FLOAT_T rho, const FLOAT_T Len,
math::ComplexNumber<FLOAT_T> Aout[][3], const FLOAT_T phase_offset){
FLOAT_T d_dmMatVac[3][3], d_dmMatMat[3][3];
getMfast(Enu, rho, type, d_dmMatMat, d_dmMatVac);
getA(Len, Enu, rho, d_dmMatVac, d_dmMatMat, type, Aout,phase_offset);
}
/*
Find density in layer
*/
template<typename FLOAT_T>
HOSTDEVICEQUALIFIER
FLOAT_T getDensityOfLayer(const FLOAT_T* const rhos, int layer, int max_layer){
if(layer == 0) return 0.0;
int i;
if(layer <= max_layer){
i = layer-1;
}else{
i = 2 * max_layer - layer - 1;
}
return rhos[i];
}
/*
Find distance in layer
*/
template<typename FLOAT_T>
HOSTDEVICEQUALIFIER
FLOAT_T getTraversedDistanceOfLayer(const FLOAT_T* const radii,
int layer,
int max_layer,
FLOAT_T PathLength,
FLOAT_T TotalEarthLength,
FLOAT_T cosine_zenith){
if(cosine_zenith >= 0) return PathLength;
if(layer == 0) return PathLength - TotalEarthLength;
int i;
if(layer >= max_layer)
i = -layer - 1 + 2 * max_layer;
else{
i = layer-1;
}
const FLOAT_T CrossThis = 2.0*sqrt( radii[i] * radii[i] - (Constants<FLOAT_T>::REarth())*(Constants<FLOAT_T>::REarth())*( 1 - cosine_zenith*cosine_zenith ) );
const FLOAT_T CrossNext = 2.0*sqrt( radii[i+1] * radii[i+1] - (Constants<FLOAT_T>::REarth())*((FLOAT_T)Constants<FLOAT_T>::REarth())*( 1 -cosine_zenith*cosine_zenith ) );
if(i < max_layer - 1){
return 0.5*( CrossThis-CrossNext )*(Constants<FLOAT_T>::km2cm());
}else{
return CrossThis*(Constants<FLOAT_T>::km2cm());
}
}
template<typename FLOAT_T>
HOSTDEVICEQUALIFIER
void calculate(NeutrinoType type,
const FLOAT_T* const cosinelist,
int n_cosines,
const FLOAT_T* const energylist,
int n_energies,
const FLOAT_T* const radii,
const FLOAT_T* const rhos,
const int* const maxlayers,
FLOAT_T ProductionHeightinCentimeter,
FLOAT_T* const result){
//prepare more constant data. For the kernel, this is done by the wrapper function callCalculateKernelAsync
#ifndef __CUDA_ARCH__
prepare_getMfast<FLOAT_T>(type);
#endif
#ifdef __CUDA_ARCH__
// on the device, we use the global thread Id to index the data
const int max_energies_per_path = SDIV(n_energies, blockDim.x) * blockDim.x;
for(unsigned index = blockIdx.x * blockDim.x + threadIdx.x; index < n_cosines * max_energies_per_path; index += blockDim.x * gridDim.x){
const unsigned index_energy = index % max_energies_per_path;
const unsigned index_cosine = index / max_energies_per_path;
#else
// on the host, we use OpenMP to parallelize looping over cosines
#pragma omp parallel for schedule(dynamic)
for(int index_cosine = 0; index_cosine < n_cosines; index_cosine += 1){
#endif
const FLOAT_T cosine_zenith = cosinelist[index_cosine];
const FLOAT_T PathLength = sqrt((Constants<FLOAT_T>::REarthcm() + ProductionHeightinCentimeter )*(Constants<FLOAT_T>::REarthcm() + ProductionHeightinCentimeter)
- (Constants<FLOAT_T>::REarthcm()*Constants<FLOAT_T>::REarthcm())*( 1 - cosine_zenith*cosine_zenith)) - Constants<FLOAT_T>::REarthcm()*cosine_zenith;
const FLOAT_T TotalEarthLength = -2.0*cosine_zenith*Constants<FLOAT_T>::REarthcm(); // in [cm]
const int MaxLayer = maxlayers[index_cosine];
math::ComplexNumber<FLOAT_T> TransitionMatrix[3][3];
math::ComplexNumber<FLOAT_T> TransitionMatrixCoreToMantle[3][3];
math::ComplexNumber<FLOAT_T> finalTransitionMatrix[3][3];
math::ComplexNumber<FLOAT_T> TransitionTemp[3][3];
#ifndef __CUDA_ARCH__
for(int index_energy = 0; index_energy < n_energies; index_energy += 1){
#else
if(index_energy < n_energies){
#endif
const FLOAT_T energy = energylist[index_energy];
// set TransitionMatrixCoreToMantle to unit matrix
UNROLLQUALIFIER
for(int i = 0; i < 3; i++){
UNROLLQUALIFIER
for(int j = 0; j < 3; j++){
TransitionMatrixCoreToMantle[i][j].re = (i == j ? 1.0 : 0.0);
TransitionMatrixCoreToMantle[i][j].im = 0.0;
}
}
// loop from vacuum layer to innermost crossed layer
for (int i = 0; i <= MaxLayer ; i++ ){
const FLOAT_T distance = getTraversedDistanceOfLayer(radii, i, MaxLayer, PathLength, TotalEarthLength, cosine_zenith);
const FLOAT_T density = getDensityOfLayer(rhos, i, MaxLayer);
get_transition_matrix( type,
energy , // in GeV
density * Constants<FLOAT_T>::density_convert(),
distance / Constants<FLOAT_T>::km2cm(),
TransitionMatrix, // Output transition matrix
FLOAT_T(0.0) // phase offset
);
if (i == 0){ // atmosphere
copy_complex_matrix( TransitionMatrix , finalTransitionMatrix );
}else if(i < MaxLayer){ // not the innermost layer, can reuse current TransitionMatrix
clear_complex_matrix( TransitionTemp );
multiply_complex_matrix( TransitionMatrix, finalTransitionMatrix, TransitionTemp );
copy_complex_matrix( TransitionTemp, finalTransitionMatrix );
clear_complex_matrix( TransitionTemp );
multiply_complex_matrix( TransitionMatrixCoreToMantle, TransitionMatrix, TransitionTemp );
copy_complex_matrix( TransitionTemp, TransitionMatrixCoreToMantle );
}else{ // innermost layer
clear_complex_matrix( TransitionTemp );
multiply_complex_matrix( TransitionMatrix, finalTransitionMatrix, TransitionTemp );
copy_complex_matrix( TransitionTemp, finalTransitionMatrix );
}
}
// calculate final transition matrix
clear_complex_matrix( TransitionTemp );
multiply_complex_matrix( TransitionMatrixCoreToMantle, finalTransitionMatrix, TransitionTemp );
copy_complex_matrix( TransitionTemp, finalTransitionMatrix );
// for oscillation probabilities where the initial wave function
// evaluates to 0+0i for two flavors and evaluates to 1+0i for the remaining third flavor,
// we don't need to perform full matrix vector multiplication
UNROLLQUALIFIER
for (int inflv = 0 ; inflv < 3 ; inflv++ ){
UNROLLQUALIFIER
for (int outflv = 0 ; outflv < 3 ; outflv++ ){
const FLOAT_T re = finalTransitionMatrix[outflv][inflv].re;
const FLOAT_T im = finalTransitionMatrix[outflv][inflv].im;
#ifdef __CUDA_ARCH__
const unsigned long long resultIndex = (unsigned long long)(n_energies) * (unsigned long long)(index_cosine) + (unsigned long long)(index_energy);
result[resultIndex + (unsigned long long)(n_energies) * (unsigned long long)(n_cosines) * (unsigned long long)((inflv * 3 + outflv))] = re * re + im * im;
#else
const unsigned long long resultIndex = (unsigned long long)(index_cosine) * (unsigned long long)(n_energies) * (unsigned long long)(9)
+ (unsigned long long)(index_energy) * (unsigned long long)(9);
result[resultIndex + (unsigned long long)((inflv * 3 + outflv))] = re * re + im * im;
#endif
}
}
}
}
}
#ifdef __NVCC__
template<typename FLOAT_T>
KERNEL
__launch_bounds__( 64, 8 )
void calculateKernel(NeutrinoType type,
const FLOAT_T* const cosinelist,
int n_cosines,
const FLOAT_T* const energylist,
int n_energies,
const FLOAT_T* const radii,
const FLOAT_T* const rhos,
const int* const maxlayers,
FLOAT_T ProductionHeightinCentimeter,
FLOAT_T* const result){
calculate(type, cosinelist, n_cosines, energylist, n_energies, radii, rhos, maxlayers, ProductionHeightinCentimeter, result);
}
template<typename FLOAT_T>
void callCalculateKernelAsync(dim3 grid,
dim3 block,
cudaStream_t stream,
NeutrinoType type,
const FLOAT_T* const cosinelist,
int n_cosines,
const FLOAT_T* const energylist,
int n_energies,
const FLOAT_T* const radii,
const FLOAT_T* const rhos,
const int* const maxlayers,
FLOAT_T ProductionHeightinCentimeter,
FLOAT_T* const result){
prepare_getMfast<FLOAT_T>(type);
calculateKernel<FLOAT_T><<<grid, block, 0, stream>>>(type, cosinelist, n_cosines, energylist, n_energies, radii, rhos, maxlayers, ProductionHeightinCentimeter, result);
CUERR;
}
#endif
} // namespace physics
} // namespace cudaprob3
#endif