How to Install HepLib

• Download and extract the all-in-one archive

wget https://heplib.github.io/download/Install.tar.gz
tar xfv Install.tar.gz

• Install using install.sh

cd Install
INSTALL_PATH=<Path to Install> jn=8 ./install.sh
# INSTALL_PATH=<Path to Install> jn=8 ./install-M1.sh # Apple Silicon Chip

Try a simple example

1. Prepare a C++ file named trace.cpp with the following content

#include "HepLib.h"
using namespace HepLib;
int main(int argc, char** argv) {
    Index mu("mu"), nu("nu");
    Vector p1("p1"), p2("p2");
    Symbol m("m");
    //note GAS(1) in gline, corresponds to the identity matrix
    ex gline = GAS(p1)*GAS(mu)*(GAS(p2)+m*GAS(1))*GAS(mu);
    ex trace = form(TR(gline));
    cout << trace << endl;
    return 0;
}

2. Compile trace.cpp using heplib++ from HepLib

INSTALL_PATH/bin/heplib++ -o trace trace.cpp

3. Run trace to get the trace for ${\rm Tr}[\gamma\cdot p_1 \ \gamma^\mu\ (\gamma\cdot p_2+m)\ \gamma_\mu]$

./trace
# -4*d*p2.p1+8*p2.p1

Copyright

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.