[Developers] CactusEinstein/2052: Patch: Add time derivatives of lapse and shift as new variables
schnetter at cct.lsu.edu
Thu Sep 7 09:32:50 CDT 2006
On Sep 7, 2006, at 09:29:59, schnetter at cct.lsu.edu wrote:
>> Number: 2052
>> Notify-List: developers at cactuscode.org
>> Category: CactusEinstein
>> Synopsis: Patch: Add time derivatives of lapse and shift as
>> new variables
>> Confidential: no
>> Severity: serious
>> Priority: medium
>> Responsible: rideout
>> State: open
>> Class: feature-request
>> Submitter-Id: user
>> Arrival-Date: Thu Sep 07 09:29:59 -0500 2006
>> Originator: Erik Schnetter
>> Release: Cactus 4.0.b16
> I suggest to add the time derivatives of lapse and shift as
> additional variables to ADMBase. Together with the extrinsic
> curvature, this allows constructing the time derivative of the four-
> metric. This "completes" the set of variables; since the Einstein
> equations are second order in time, initial data for them have to
> set both the four-metric and its time derivative.
> This is necessary to provide complete initial data to some
> formulations of Einstein's equations which are not based on lapse
> and shift. It also allows using exact solutions with such
> The new variables have no storage by default. Their storage is
> handled in the same way as for the shift, i.e., via parameters and
> a run time state variable.
> Later, other thorns (such as AEIThorns/Exact) would be modified to
> set these variables as well when they have storage.
It seems these emails to the developers' list are now sent
automatically. Could that be changed to exclude the ill-formatted un-
readable base64-encoded attachments? I thought we wanted to forward
these emails manually, so that people can strip off the debris and/
or attach the attachment in clear text?
Erik Schnetter <schnetter at cct.lsu.edu>
My email is as private as my paper mail. I therefore support encrypting
and signing email messages. Get my PGP key from www.keyserver.net.
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