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The Scale Factor and Its Derivatives
The function scale() outputs the scale factor , the
Hubble constant
, and the second derivative
. These quantities are all output in physical units. Using
the rescalings in equation (6.2) these can be written in
terms of program variables as
|
(5.2) |
|
(5.3) |
The file scale_ext contains one column for the time and
three for these three quantities, in the order just given. Note that
even if sscale is set to one this function is only called
if self-consistent expansion is used. If there is no expansion then
there is no scale factor evolution and for power-law expansion this
evolution is simply given by a fixed equation.
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This
documentation was generated on 2008-01-21