[Yt-dev] EnzoCosmology

[Matthew Turk]

Hi Stephen,

I have a copy of RedshiftOutput0005.  In mine, there are some
parameters that seem a bit funny to me:

InitialTime         = 646.75066015177

Using pf.cosmology_get_units it returns that this means the start time
was 1.45e12; same answer if you use lengthunits/velocityunits as the
time unit.  The creation time, in light of this, doesn't seem so bad.
The current redshift is also zero, which I suppose means it's the
final output.

Can you tell us a bit more about this particular simulation and how
you initialized it?

-Matt

On Sat, Jun 20, 2009 at 11:17 AM, Stephen Skory<stephenskory at yahoo.com> wrote:
>
> Guys,
>
> I need an idiot check. This is a unremarkable test simulation with star formation. Am I reading it correctly that according to the time calculations, yt thinks the last star was formed after 1.4 trillion years, not 14 billion years? Or am I doing something wrong? If I'm correct, there are some hubble value inconsistencies outside of EnzoCosmology, too?
>
>>>> pf = load('RedshiftOutput0005')
>>>> sp = pf.h.sphere([0.5]*3,2.)
> yt         INFO       2009-06-20 11:09:27,958 Adding Z_Field1 to list of fields
> yt         INFO       2009-06-20 11:09:27,958 Adding Z_Field2 to list of fields
>>>> ct = sp["creation_time"]
> yt         INFO       2009-06-20 11:09:55,519 Getting field creation_time from 1172
>>>> print "%1.5e" % (max(ct) * pf["years"])
> 1.45113e+12
>
>  _______________________________________________________
> sskory at physics.ucsd.edu           o__  Stephen Skory
> http://physics.ucsd.edu/~sskory/ _.>/ _Graduate Student
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