propagation.h

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/*
 *    Copyright (c) 2015-2018
 *      SMASH Team
 *
 *    GNU General Public License (GPLv3 or later)
 */

#ifndef SRC_INCLUDE_PROPAGATION_H_
#define SRC_INCLUDE_PROPAGATION_H_

#include <vector>

#include "lattice.h"
#include "particles.h"
#include "potentials.h"

namespace smash {

struct ExpansionProperties {
  ExpansionMode mode_;
  double b_;
  ExpansionProperties(ExpansionMode mode, double b) : mode_(mode), b_(b) {}
};

double calc_hubble(double time, const ExpansionProperties &metric);

double propagate_straight_line(Particles *particles, double to_time,
                               const std::vector<FourVector> &beam_momentum);

void expand_space_time(Particles *particles,
                       const ExperimentParameters &parameters,
                       const ExpansionProperties &metric);

void update_momenta(
    Particles *particles, double dt, const Potentials &pot,
    RectangularLattice<std::pair<ThreeVector, ThreeVector>> *FB_lat,
    RectangularLattice<std::pair<ThreeVector, ThreeVector>> *FI3_lat);

}  // namespace smash
#endif  // SRC_INCLUDE_PROPAGATION_H_