Bare values are given in Planck units where
. The FRW metric is taken to be
meaning bare time is measured in physical
units and bare distances are measured in comoving
coordinates. Variables that have been rescaled in the program are
denoted by the subscript
. Repeated indices are summed unless
otherwise indicated. Overdots indicate differentiation with respect to
the bare time
while primes indicate differentiation with respect
to the program time
.
Generic properties of fields are indicated by using for the field
variable. Subscripts such as
will be used only where needed for
clarity.
and
refer to continuous and discrete Fourier
transforms of
respectively. These are discussed at greater length
in section 6.3.
The scale factor and time are initially set to and
respectively for convenience.
Frequently the documentation refers to files included in the LATTICEEASY distribution, or to variables and/or functions in the program. These file names are written in a typewriter font, as in latticeeasy.cpp. Output files created by the program are printed in the same way. The functions and variables in the program are also in typewriter font, but they have also been slanted, as in nflds and potential_energy(). (An exception to this is when program variables appear in equations, in which case they are displayed in the usual equation format for readability.) Functions will always be indicated with parentheses, but the arguments to the function will generally not be included.