# Parameter definitions for thorn Einstein
# $Header$

# Each thorn which extends method should implement parameters for:
#
# slicing
# method

shares: grid

EXTENDS KEYWORD symmetry ""
{
}

global:

LOGICAL use_conformal "Use conformal metric?"
{
} "yes"

LOGICAL use_conformal_derivs "Use derivatives of conformal metric?"
{
} "yes"

restricted:

KEYWORD initial_data "Physical spacetime model to evolve"
{
  "flat" :: "Flat Minkowski space"
} "flat"


KEYWORD evolution_system "Spacetime system to evolve"
{
  "none" :: "Do not use a spacetime" 
} "none"

KEYWORD lapseinit "How to initialise the lapse"
{
  "one"      :: "Set to unity"
  "gaussian" :: "Set to a gaussian bump (flatty)"
} "one"

REAL gaussian_amplitude "Amplitude of gaussian bump in lapse"
{
 : :: ""
} 0.05

REAL gaussian_sigma2 "Sigma**2 of gaussian bump in lapse"
{
 : :: ""
} 0.05

KEYWORD shift "Which shift condition to use"
{
  "none" :: "No shift is used"
  "zero" :: "Zero shift is used"
} "none"


private:
 
REAL dtfac "Courant factor for evolution"
{
 : :: "Can  in principle be anything, although negative would be strange"
} 0.5


LOGICAL conformal_storage_all "Assign storage for psi and derivatives"
{
} "yes"

LOGICAL rsquared_in_sphm "Parameter in carttosphere, what does it ?"
{
} "no"


# Courant

LOGICAL use_courant "Calculate timestep using Courant condition?"
{
} "no"