Page MenuHomeHEPForge
Files F8309845

No OneTemporary
Actions

View Options

diff --git a/include/HEJ/Tensor.hh b/include/HEJ/Tensor.hh
index 4afda37..0bf7c91 100644
--- a/include/HEJ/Tensor.hh
+++ b/include/HEJ/Tensor.hh
@@ -1,333 +1,380 @@
/** \file
* \brief Tensor Template Class declaration.
*
* This file contains the declaration of the Tensor Template class. This
* is used to calculate some of the more complex currents within the
* W+Jets implementation particularly.
*
* \authors The HEJ collaboration (see AUTHORS for details)
* \date 2019
* \copyright GPLv2 or later
*/
#pragma once
#include <array>
///@TODO remove function implementation from header
///@TODO put in some namespace
template <unsigned int N, unsigned int D>
class Tensor{
public:
- //Constructor
+ //! Constructor
Tensor();
Tensor(COM x);
- //Destructor
+ //! Destructor
virtual ~Tensor();
+ /**
+ *\brief Returns Rank of Tensor (N in T<N,D>)
+ */
int rank();
+ /**
+ *\brief Returns dimension of Tensor (D in T<N,D>)
+ */
int dim();
+ /**
+ *\brief Returns dim of Tensor
+ */
int len();
+ /**
+ *\brief Value of rank 1 Tensor for given i value.
+ */
COM at(int i);
+
+ /**
+ *\brief Value of rank 2 Tensor for given (i,j) value.
+ */
COM at(int i, int j);
+
+ /**
+ *\brief Value of rank 3 Tensor for given (i,j,k) value.
+ */
COM at(int i, int j, int k);
+
+ /**
+ *\brief Value of rank 4 Tensor for given (i,j,k,l) value.
+ */
COM at(int i,int j, int k,int l);
+
+ /**
+ *\brief Value of rank 3 Tensor for given (i,j,k,l,m) value.
+ */
COM at(int i,int j, int k,int l, int m);
+ /**
+ *\brief Checks that components of Tensor non zero.
+ */
bool isSet();
void Fill(COM x);
- //Set component indexed by i,j,k,l,m
+ /**
+ *\brief Set value of rank 1 Tensor for given i value to x.
+ */
void Set(int i,COM x);
+ /**
+ *\brief Set value of rank 2 Tensor for given i,j value to x.
+ */
void Set(int i, int j, COM x);
+ /**
+ *\brief Set value of rank 3 Tensor for given i,j,k value to x.
+ */
void Set(int i, int j, int k, COM x);
+ /**
+ *\brief Set value of rank 4 Tensor for given i,j,k,l value to x.
+ */
void Set(int i,int j, int k,int l,COM x);
+ /**
+ *\brief Set value of rank 5 Tensor for given i,j,k,l,m value to x.
+ */
void Set(int i,int j, int k,int l, int m, COM x);
Tensor<N,D> operator*(const double x);
Tensor<N,D> operator*(const COM x);
Tensor<N,D> operator/(const double x);
Tensor<N,D> operator/(const COM x);
Tensor<N,D> operator+(const Tensor<N,D> T2);
Tensor<N,D> operator-(const Tensor<N,D> T2);
void operator+=(const Tensor<N,D> T2);
void operator-=(const Tensor<N,D> T2);
/**
* \brief Multiply Tensor from Right: T1^(mu1...mk..mN-1)T2_(muN)
* @param T2 Tensor of Rank 1 to multiply from right with with.
* @returns T1.contract(T2,1) -> T1^(mu,nu,rho...)T2^sigma
*/
Tensor<N+1,D> rightprod(const Tensor<1,D> T2);
/**
* \brief Multiply Tensor from Left: T2_(muN)T1^(mu1...mk..mN-1)
* @param T2 Tensor of Rank 1 to multiply from left with with.
* @returns T1.contract(T2,1) -> T2^sigma T1^(mu,nu,rho...)
*/
Tensor<N+1,D> leftprod(const Tensor<1,D> T2);
/**
* \brief T^(mu1...mk..mN)T2_(muk) contract kth index, where k member of [1,N]
* @param T2 Tensor of Rank 1 to contract with.
* @param k int to contract Tensor T2 with from original Tensor.
* @returns T1.contract(T2,1) -> T1^(mu,nu,rho...)T2_mu
*/
Tensor<N-1,D> contract(const Tensor<1,D> T2, int k);
std::valarray<COM> components;
private:
-
int size;
- COM sign(unsigned int i){
- if(i==0)
- return 1.;
- else
- return -1.;
- }
-
+ COM sign(unsigned int i);
};
template <unsigned int N, unsigned int D>
Tensor<N,D>::Tensor(){
size = pow(D,N);
components.resize(size);
}
template <unsigned int N, unsigned int D>
Tensor<N,D>::Tensor(COM x) {
size = pow(D,N);
components.resize(size, x);
}
template <unsigned int N, unsigned int D>
Tensor<N,D>::~Tensor() {}
template <unsigned int N, unsigned int D>
int Tensor<N,D>::rank(){
return N;
}
template <unsigned int N, unsigned int D>
int Tensor<N,D>::dim(){
return D;
}
template <unsigned int N, unsigned int D>
int Tensor<N,D>::len(){
return size;
}
template <unsigned int N, unsigned int D>
COM Tensor<N,D>::at(int i){
return components[i];
}
template <unsigned int N, unsigned int D>
COM Tensor<N,D>::at(int i, int j) {
return components[D*i +j];
}
template <unsigned int N, unsigned int D>
COM Tensor<N,D>::at(int i, int j, int k) {
return components[D*(D*i + j)+ k];
}
template <unsigned int N, unsigned int D>
COM Tensor<N,D>::at(int i,int j, int k,int l) {
return components[D*(D*(D*i +j) + k) + l];
}
template <unsigned int N, unsigned int D>
COM Tensor<N,D>::at(int i,int j, int k,int l, int m){
return components[D*(D*(D*(D*i + j) + k) + l) + m];
}
template <unsigned int N, unsigned int D>
bool Tensor<N,D>::isSet(){
if(components.size()==0)
return false;
else
return true;
}
template <unsigned int N, unsigned int D>
void Tensor<N,D>::Fill(COM x){
components=x;
}
template <unsigned int N, unsigned int D>
void Tensor<N,D>::Set(int i,COM x){
components[i] = x;
}
template <unsigned int N, unsigned int D>
void Tensor<N,D>::Set(int i, int j, COM x) {
components[D*i +j] = x;
}
template <unsigned int N, unsigned int D>
void Tensor<N,D>::Set(int i, int j, int k, COM x) {
components[D*(D*i + j)+ k] = x;
}
template <unsigned int N, unsigned int D>
void Tensor<N,D>::Set(int i,int j, int k,int l,COM x) {
components[D*(D*(D*i +j) + k) + l] = x;
}
template <unsigned int N, unsigned int D>
void Tensor<N,D>::Set(int i,int j, int k,int l, int m, COM x){
components[D*(D*(D*(D*i + j) + k) + l) + m] = x;
}
template <unsigned int N, unsigned int D>
Tensor<N,D> Tensor<N,D>::operator*(const double x){
Tensor<N,D> newT;
newT.components=components*COM(x,0);
return newT;
}
template <unsigned int N, unsigned int D>
Tensor<N,D> Tensor<N,D>::operator*(const COM x){
Tensor<N,D> newT;
newT.components=components*x;
return newT;
}
template <unsigned int N, unsigned int D>
Tensor<N,D> Tensor<N,D>::operator/(const double x){
Tensor<N,D> newT;
newT.components=components/COM(x,0);
return newT;
}
template <unsigned int N, unsigned int D>
Tensor<N,D> Tensor<N,D>::operator/(const COM x){
Tensor<N,D> newT;
newT.components=components/x;
return newT;
}
template <unsigned int N, unsigned int D>
Tensor<N,D> Tensor<N,D>::operator+(const Tensor<N,D> T2){
Tensor<N,D> newT;
newT.components=components+T2.components;
return newT;
}
template <unsigned int N, unsigned int D>
Tensor<N,D> Tensor<N,D>::operator-(const Tensor<N,D> T2){
Tensor<N,D> newT;
newT.components=components-T2.components;
return newT;
}
template <unsigned int N, unsigned int D>
void Tensor<N,D>::operator+=(const Tensor<N,D> T2){
components = components+T2.components;
}
template <unsigned int N, unsigned int D>
void Tensor<N,D>::operator-=(const Tensor<N,D> T2){
components=components-T2.components;
}
template <unsigned int N, unsigned int D>
Tensor<N+1,D> Tensor<N,D>::rightprod(const Tensor<1,D> T2){
Tensor<N+1,D> newT;
for(int i=0; i<size;i++){
for(unsigned int j=0;j<D;j++){
newT.components[i*D+j]=components[i]*T2.components[j];
}
}
return newT;
}
template <unsigned int N, unsigned int D>
Tensor<N+1,D> Tensor<N,D>::leftprod(const Tensor<1,D> T2){
Tensor<N+1,D> newT;
for(unsigned int j=0;j<D;j++){
for(int i=0; i<size;i++){
newT.components[j*size+i]=components[i]*T2.components[j];
}
}
return newT;
}
template <unsigned int N, unsigned int D>
Tensor<N-1,D> Tensor<N,D>::contract(const Tensor<1,D> T2, int k){
Tensor<N-1,D> newT;
for(int j=0; j<newT.len(); j++){
COM temp;
int itemp = pow(D,(N-k));
for (unsigned int i=0; i<D; i++){
int index = D*itemp*floor(j/itemp) + itemp*i +j%(itemp);
temp+=components[index]*T2.components[i]*sign(i);
}
newT.components[j]=temp;
}
return newT;
}
+template <unsigned int N, unsigned int D>
+COM Tensor<N,D>::sign(unsigned int i){
+ if(i==0)
+ return 1.;
+ else
+ return -1.;
+}
+
+
/**
* \brief Returns +--- Metric
* @returns Metric (+,-,-,-) {(1,0,0,0),(0,-1,0,0),(0,0,-1,0),(0,0,0,-1)}
*/
Tensor<2,4> Metric();
/**
* \brief Calculates current <p1|mu|p2>
* @param p1 Momentum of Particle 1
* @param h1 Helicity of Particle 1 (Boolean, False = -h, True = +h)
* @param p2 Momentum of Particle 2
* @param h2 Helicity of Particle 2 (Boolean, False = -h, True = +h)
* @returns Tensor T^mu = <p1|mu|p2> (in/out configuration considered in calc)
*/
Tensor<1,4> TCurrent(CLHEP::HepLorentzVector p1, bool h1,
CLHEP::HepLorentzVector p2, bool h2);
/**
* \brief Calculates current <p1|mu nu rho|p2>
* @param p1 Momentum of Particle 1
* @param h1 Helicity of Particle 1 (Boolean, False = -h, True = +h)
* @param p2 Momentum of Particle 2
* @param h2 Helicity of Particle 2 (Boolean, False = -h, True = +h)
* @returns Tensor T^mu^nu^rho = <p1|mu nu rho|p2> (in/out configuration considered in calc)
*/
Tensor<3,4> T3Current(CLHEP::HepLorentzVector p1, bool h1,
CLHEP::HepLorentzVector p2, bool h2);
/**
* \brief Calculates current <p1|mu nu rho tau sigma|p2>
* @param p1 Momentum of Particle 1
* @param h1 Helicity of Particle 1 (Boolean, False = -h, True = +h)
* @param p2 Momentum of Particle 2
* @param h2 Helicity of Particle 2 (Boolean, False = -h, True = +h)
* @returns Tensor T^mu^nu^rho = <p1|mu nu rho tau sigma|p2> (in/out configuration considered in calc)
*/
Tensor<5,4> T5Current(CLHEP::HepLorentzVector p1, bool h1,
CLHEP::HepLorentzVector p2, bool h2);
/**
* \brief Convert from CCurrent class
* @param j Current in CCurrent format
* @returns Current in Tensor Format
*/
Tensor<1,4> Construct1Tensor(CCurrent j);
/**
* \brief Convert from HLV class
* @param p Current in HLV format
* @returns Current in Tensor Format
*/
Tensor<1,4> Construct1Tensor(CLHEP::HepLorentzVector p);
/**
* \brief Construct Epsilon (Polarisation) Tensor
* @param k Momentum of incoming/outgoing boson
* @param ref Reference momentum for calculation
* @param pol Polarisation of boson
* @returns Polarisation Tensor E^mu
*/
Tensor<1,4> eps(CLHEP::HepLorentzVector k, CLHEP::HepLorentzVector ref, bool pol);
bool init_sigma_index();

File Metadata

Mime Type
text/x-diff
Expires
Sat, Dec 21, 4:41 PM (18 h, 19 m)
Storage Engine
blob
Storage Format
Raw Data
Storage Handle
4023489
Default Alt Text
(10 KB)

Event Timeline