LATTICEEASY: A program for lattice simulations of scalar fields in an expanding universe

Published: 15-06-2008| Version 1 | DOI: 10.17632/2772hpwdn4.1
Gary Felder,
Igor Tkachev


Abstract We describe a C++ program that we have written and made available for calculating the evolution of interacting scalar fields in an expanding universe. The program is particularly useful for the study of reheating and thermalization after inflation. The program and its full documentation are available on the Web at In this paper we provide a brief overview of what the program does and what it is useful for. Title of program: LATTICEEASY Catalogue Id: AEAW_v1_0 Nature of problem After inflation the universe consisted of interacting fields in a high energy, nonthermal state. [1] The evolution of these fields can not be described with standard approximation techniques such as linearization, kinetic theory, or Hartree expansion, and must thus be simulated numerically. Fortunately, the fields rapidly acquire large occupation numbers over a range of frequencies, so their evolution can be accurately modeled with classical field theory. [2] The specific fields and interactions ... Versions of this program held in the CPC repository in Mendeley Data AEAW_v1_0; LATTICEEASY; 10.1016/j.cpc.2008.02.009 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)