LinearBreitWheelerCrossSection.H File Reference

#include "Utils/WarpXConst.H"
#include <AMReX_REAL.H>
#include <cmath>

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Functions
AMREX_GPU_HOST_DEVICE AMREX_INLINE amrex::ParticleReal	LinearBreitWheelerCrossSection (const amrex::ParticleReal &E_star)
	Computes the linear Breit-Wheeler cross section (refer to, for example, [Gould and Schreder Phys. Rev. 155, 1404 (1967)]) as a function of E_star. E_star is the kinetic energy of each photon in the center of momentum frame. If E_star < m_e * c^2, then the total kinetic energy in the center of momentum frame is not enough to produce a pair, hence the cross-section is zero.

Function Documentation

LinearBreitWheelerCrossSection()

AMREX_GPU_HOST_DEVICE AMREX_INLINE amrex::ParticleReal LinearBreitWheelerCrossSection

(

const amrex::ParticleReal &

E_star

)

Computes the linear Breit-Wheeler cross section (refer to, for example, [Gould and Schreder Phys. Rev. 155, 1404 (1967)]) as a function of E_star. E_star is the kinetic energy of each photon in the center of momentum frame. If E_star < m_e * c^2, then the total kinetic energy in the center of momentum frame is not enough to produce a pair, hence the cross-section is zero.

Parameters

[in]

E_star

the kinetic energy of each photon involved in the collision in the center of momentum frame, in SI units.

Returns

The total cross section in SI units (square meters).