path: root/param.ccl

# parameter definitions for thorn Exact
# $Header$

shares: admbase

################################################################################
##### keyword parameters from other thorns #####################################
################################################################################

USES KEYWORD metric_type

EXTENDS KEYWORD initial_data 
{
  "exact" :: "Initial data from exact solution"
  "slice" :: "Initial data from exact solution on arbitrary slice"
}

EXTENDS KEYWORD lapse_evolution_method
{
  "exact" :: "Use lapse from exact solution"
}
EXTENDS KEYWORD shift_evolution_method
{
  "exact" :: "Use shift from exact solution"
}

EXTENDS KEYWORD dtlapse_evolution_method
{
  "exact" :: "Use lapse from exact solution"
}
EXTENDS KEYWORD dtshift_evolution_method
{
  "exact" :: "Use shift from exact solution"
}

EXTENDS KEYWORD initial_lapse
{
  "exact" :: "Initial lapse from exact solution"
}
EXTENDS KEYWORD initial_shift
{
  "exact" :: "Initial shift from exact solution"
}
EXTENDS KEYWORD initial_dtlapse
{
  "exact" :: "Initial dtlapse from exact solution"
}
EXTENDS KEYWORD initial_dtshift
{
  "exact" :: "Initial dtshift from exact solution"
}

EXTENDS KEYWORD evolution_method
{
  "exact" :: "Fake an evolution by setting exact data at every timestep"
  "slice" :: "Evolve arbitrary slice and extract Cauchy data"
}

shares: StaticConformal

USES KEYWORD conformal_storage

################################################################################
##### parameters for the blended boundary conditions ###########################
################################################################################

private:

BOOLEAN exblend_Ks "Blend the K variables with the exact solution?"
{
} "yes"

BOOLEAN exblend_gs "Blend the g variables with the exact solution?"
{
} "yes"

BOOLEAN exblend_gauge "Blend the lapse and shift with the exact solution?"
{
} "yes"

REAL exblend_rout "Outer boundary of blending region"
{
*:* :: "Positive means radial value, negative means use outer bound of grid"
} -1.0

REAL exblend_width "Width of blending zone"
{
*:* :: "Positive means width in radius, negative means width = exbeldn_width*dx"
} -3.0

################################################################################
##### parameters for slice initialize ##########################################
################################################################################

private:

REAL slice_Gauss_ampl "Amplitude of Gauss slice in exact"
{
0.0:* :: "Positive please"
} 0.0

REAL slice_Gauss_width "Width of Gauss slice in exact"
{
0.0:* :: "Positive please"
} 1.0

# this parameter is used directly in our schedule.ccl file
KEYWORD overwrite_boundary "Overwrite g and K on the boundary"
{
  "no"    :: "Do nothing"
  "exact" :: "Use boundary data from an exact solution on a trivial slice"
} "no"

################################################################################
##### parameters for calculating the extrinsic curvature #######################
################################################################################

private:

INT exact_order "finite differencing order"
{
2 :: "2"
4 :: "4"
} 2

REAL exact_eps "finite differencing stencil size (in terms of the grid spacing)"
{
(0.0:* :: "Positive please"
} 1.0e-6

################################################################################
##### parameters for boosting any non-stress-energy-tensor model ###############
################################################################################

private:

REAL boost_vx "x component of boost velocity"
{
*:* :: "any real number"
} 0.0
REAL boost_vy "y component of boost velocity"
{
*:* :: "any real number"
} 0.0
REAL boost_vz "z component of boost velocity"
{
*:* :: "any real number"
} 0.0

################################################################################
##### parameters for adding to the shift of any model ##########################
################################################################################

private:

REAL shift_add_x "x component of added shift"
{
*:* :: "any real number"
} 0.0
REAL shift_add_y "y component of added shift"
{
*:* :: "any real number"
} 0.0
REAL shift_add_z "z component of added shift"
{
*:* :: "any real number"
} 0.0

################################################################################
##### parameters for rotating any model ########################################
################################################################################

private:

REAL rotation_euler_phi "Euler angle phi (first rotation, about z axis) (irrelevant for axisymmetric models)"
{
*:* :: "any real number"
} 0.0
REAL rotation_euler_theta "Euler angle theta (second rotation, about x axis)"
{
*:* :: "any real number"
} 0.0
REAL rotation_euler_psi "Euler angle psi (third rotation, about z axis)"
{
*:* :: "any real number"
} 0.0

################################################################################
##### general comments #########################################################
################################################################################

#
# All remaining parameters *should* be visible only to this thorn
# and its friends.  In particular, the stress-energy tensor code in
# src/include/Scalar_CalcTmunu.inc needs to look at various parameters to
# see what to do... and (via the magic of #include and the Cactus
# USES INCLUDE SOURCE mechanism) this code is effectively part of
# various evolution thorns.
#
# Alas, Cactus doesn't (yet) provide any way for a (this) thorn to "push"
# parameters into friends without the friends having to know where the
# pushed parameters came from... and we don't want the evolution thorns
# themselves to have to know our name and those of all the other thorns
# which provide pieces of the stress-energy tensor.
#
# Instead, we use a kludge: we copy all the relevant parameters
# (exact_model and all those for models which have stress-energy tensor
# computations) into restricted grid scalars.  These _are_ "pushed" into
# friends... and because friendship is transitive, it suffices for us to
# be friends of ADMCoupling.
#
# Since grid scalars can't be varying-length character strings, we also
# have to decode keyword parameters into integers in this process.  The
# values for those integers are given by #define constants in
# src/include/param_defs.inc .
#

################################################################################

#
# ***** naming conventions *****
#
# A "model" refers to the combination of a spacetime and a coordinate
# system; we use the model name "spacetime/coordinates" in cases where
# we have the same spacetime in different coordinate systems.
#
# We use "spacetime+Lambda" to describe a with-cosmological-constant
# variant of a given spacetime.
#
# All the parameters for individual models have names which begin
# with the model name (with any '/' or '-' characters converted to '_'),
# followed by '__'.  The description comment for each parameter begins
# with the model name followed by ':'.  For example:
#
#	REAL Schwarzschild_EF__mass "Schwarzschild/EF: BH mass"
#	{
#	*:* :: "any real number"
#	} 1.0
#

################################################################################
##### exact_model ##############################################################
################################################################################

restricted:

#
# see the file  doc/how_to_add_a_new_model  for instructions on adding
# a new model
#
KEYWORD exact_model "The exact solution/coordinates used in thorn exact"
{
#
# Minkowski spacetime
#
"Minkowski"                    :: "Minkowski spacetime"
"Minkowski/shift"              :: "Minkowski spacetime with time-dependent shift vector"
"Minkowski/funny"              :: "Minkowski spacetime in non-trivial spatial coordinates"
"Minkowski/gauge wave"         :: "Minkowski spacetime in gauge-wave coordinates"
"Minkowski/shifted gauge wave" :: "Minkowski spacetime in shifted gauge-wave coordinates"
"Minkowski/conf wave"          :: "Minkowski spacetime with 'waves' in conformal factor"
#
# black hole spacetimes
#
"Schwarzschild/EF"           :: "Schwarzschild spacetime in Eddington-Finkelstein coordinates"
"Schwarzschild/PG"           :: "Schwarzschild spacetime in Painleve-Gullstrand coordinates"
"Schwarzschild/BL"           :: "Schwarzschild spacetime in Brill-Lindquist coordinates"
"Schwarzschild/Novikov"      :: "Schwarzschild spacetime in Novikov coordinates"
"Schwarzschild-Lemaitre"     :: "Schwarzschild metric in Schwarzschild coordinates, with cosmological constant"
"Kerr/Boyer-Lindquist"       :: "Kerr spacetime in Boyer-Lindquist coordinates"
"Kerr/Kerr-Schild"           :: "Kerr spacetime in Kerr-Schild coordinates"
"Kerr/Kerr-Schild/spherical" :: "Kerr spacetime in distorted Kerr-Schild coordinates such that the horizon is a coordinate sphere"
"multi-BH"                   :: "Majumdar-Papapetrou or Kastor-Traschen maximally charged multi BH solutions"
"Alvi"                       :: "Alvi post-Newtonian 2BH spacetime (not fully implemented yet)"
"Thorne-fakebinary"          :: "Thorne's fake-binary spacetime (non-Einstein)"
#
# cosmological spacetimes
#
"Lemaitre"              :: "Lemaitre-type spacetime"
##"Robertson-Walker"      :: "Robertson-Walker spacetime"
"de Sitter"             :: "de Sitter spacetime (R-W cosmology, near t=0, p=0)"
"de Sitter+Lambda"      :: "de Sitter spacetime with cosmological constant"
"anti-de Sitter+Lambda" :: "anti-de Sitter spacetime with cosmological constant"
"Bianchi I"             :: "approximate Bianchi type I spacetime"
"Goedel"                :: "Goedel spacetime"
"Bertotti"              :: "Bertotti spacetime"
"Kasner-like"           :: "Kasner-like spacetime"
"Kasner-axisymmetric"   :: "axisymmetric Kasner spacetime"
"Kasner-generalized"    :: "generalized Kasner spacetime"
"Gowdy-wave"	        :: "Gowdy spacetime with polarized wave on a torus"
"Milne"                 :: "Milne spacetime for pre-big-bang cosmology"
#
# miscelaneous spacetimes
#
"boost-rotation symmetric" :: "boost-rotation symmetric spacetime"
"bowl"                     :: "bowl (bag-of-gold) spacetime (non-Einstein)"
"constant density star"    :: "constant density (Schwarzschild) star"
} "Minkowski"

################################################################################
##### Minkowski spacetime ######################################################
################################################################################

#
# parameters for Minkowski spacetime (trivial txyz coordinates)
#

# there are no parameters

################################################################################

#
# parameters for Minkowski spacetime with time-dependent shift vector
#

REAL Minkowski_shift__amplitude "Minkowski/shift: amplitude of Gaussian"
{
(-1:1) :: "any real number < 1 in absolute value"
} 0.5

REAL Minkowski_shift__sigma "Minkowski/shift: width of Gaussian"
{
(0.0:* :: "any real number > 0"
} 1.0

################################################################################

#
# parameters for Minkowski spacetime with non-trivial spatial coordinates
#

# FIXME: can this also be negative, i.e. range (-1,1)?
REAL Minkowski_funny__amplitude "Minkowski/funny: amplitude of Gaussian"
{
[0.0:1.0 :: "any real number in the range [0,1)"
} 0.5

REAL Minkowski_funny__sigma "Minkowski/funny: width of Gaussian"
{
(0.0: :: "any real number > 0"
} 1.0

################################################################################

#
# parameters for Minkowski spacetime in gauge-wave coordinates
#

KEYWORD Minkowski_gauge_wave__what_fn \
  "Minkowski/gauge wave: what function to use"
{
"sin"      :: "1-a*sin(x)"
"expsin"   :: "exp(a*sin(x)*cos(t))"
"Gaussian" :: "1-a*exp(-x**2)"
} "sin"
 
REAL Minkowski_gauge_wave__amplitude \
  "Minkowski/gauge wave: amplitude of the wave"
{
*:* :: "any real number"
} 0.5
  
REAL Minkowski_gauge_wave__omega \
  "Minkowski/gauge wave: angular frequency of the wave in time"
{
*:* :: "any real number"
} 1.0
    
BOOLEAN Minkowski_gauge_wave__diagonal \
  "Minkowski/gauge wave: should the wave run diagonally across the grid?"
{
} "no"
   
REAL Minkowski_gauge_wave__lambda \
  "Minkowski/gauge wave: wavelength of waves"
{
*:* :: "any real number"
} 0.5    

REAL Minkowski_gauge_wave__phase \
  "Minkowski/gauge wave: phase shift of wave"
{
*:* :: "any real number"
} 0.0

################################################################################

#
# parameters for Minkowski spacetime in gauge-wave coordinates
#

REAL Minkowski_conf_wave__amplitude \
  "Minkowski/conf wave: amplitude of the variation of the conformal factor"
{
  0:* :: "any positive real number"
} 0.5

REAL Minkowski_conf_wave__wavelength \
  "Minkowski/conf wave: wave length in cactus units"
{
  0:* :: "any positive real number"
} 1.0

INT Minkowski_conf_wave__direction \
  "Minkowski/conf wave: direction of 'wave' 0,1,2 : x,y,z"
{
  0:2 :: "0, 1 or 2 for x, y or z"
} 0

################################################################################
##### black hole spacetimes ####################################################
################################################################################

#
# parameters for Schwarzschild metric in Eddington-Finkelstein coordinates
#

REAL Schwarzschild_EF__mass "Schwarzschild/EF: BH mass"
{
*:* :: "any real number"
} 1.0

REAL Schwarzschild_EF__epsilon "Schwarzschild/EF: numerical fudge"
{
0.0:* :: "any real number >= 0.0"
} 1.e-16

################################################################################

#
# parameters for Schwarzschild metric in Painleve-Gustrand coordinates
#

REAL Schwarzschild_PG__mass "Schwarzschild/PG: BH mass"
{
(0.0:* :: "any real number > 0.0"
} 1.0

REAL Schwarzschild_PG__epsilon "Schwarzschild/PG: numerical fudge"
{
0.0:* ::  "any real number >= 0.0"
} 1.e-16

################################################################################

#
# parameters for Schwarzschild metric in Brill-Lindquist coordinates
#

REAL Schwarzschild_BL__mass "Schwarzschild/BL: BH mass"
{
(0.0:* :: "any real number > 0.0"
} 1.0

REAL Schwarzschild_BL__epsilon "Schwarzschild/BL: numerical fudge"
{
0.0:* :: "any real number >= 0.0"
} 1.e-16

################################################################################

# parameters for Schwarzschild metric in Novikov coordinates

REAL Schwarzschild_Novikov__mass "Schwarzschild/Novikov: BH mass"
{
(0.0:* :: "any real number > 0.0"
} 1.0

REAL Schwarzschild_Novikov__epsilon "Schwarzschild/Novikov: numerical fudge"
{
0.0:* :: "any real number >= 0.0"
} 1.e-16

################################################################################

# parameters for Schwarzschild-Lemaitre metric
# (Schwarzschild black hole with cosmological constant)

REAL Schwarzschild_Lemaitre__Lambda "Schwarzschild-Lemaitre: cosmological constant"
{
*:* :: "any real number"
} 1.0

REAL Schwarzschild_Lemaitre__mass "Schwarzschild-Lemaitre: BH mass"
{
(0.0:* :: "any real number > 0"
} 1.0

################################################################################

# parameters for Kerr metric in Boyer-Lindquist coordinates

REAL Kerr_BoyerLindquist__spin \
  "Kerr/Boyer-Lindquist: dimensionless spin parameter a = J/m^2"
{
-1.0:1.0 :: "dimensionless spin parameter a = J/m^2 for Kerr black hole"
} 0.6

REAL Kerr_BoyerLindquist__mass "Kerr/Boyer-Lindquist: BH mass"
{
(0.0:* :: "any real number > 0"
} 1.0

################################################################################

#
# parameters for Kerr metric in Kerr-Schild coordinates
#

# the black hole is boosted in the z direction with this velocity,
# i.e., the black hole is located at x=0, y=0, and z=vt
REAL Kerr_KerrSchild__boost_v "Kerr/Kerr-Schild: boost velocity of black hole in z direction"
{
(-1:1) :: "any real number with absolute value < 1"
} 0.0

REAL Kerr_KerrSchild__epsilon "Kerr/Kerr-Schild: numerical fudge"
{
0.0:* :: "any real number >= 0.0"
} 1.e-16

INT Kerr_KerrSchild__power "Kerr/Kerr-Schild: power (exponent) of numerical fudge"
{
1:* :: ""
} 4

BOOLEAN Kerr_KerrSchild__parabolic "Kerr/Kerr-Schild: use a parabolic singularity-avoiding term"
{
} "no"

REAL Kerr_KerrSchild__mass "Kerr/Kerr-Schild: BH mass"
{
(0.0:* :: "any real number > 0"
} 1.0

REAL Kerr_KerrSchild__spin \
  "Kerr/Kerr-Schild: dimensionless spin parameter a = J/m^2"
{
-1.0:1.0 :: "dimensionless spin parameter a = J/m^2 for Kerr black hole"
} 0.6

REAL Kerr_KerrSchild__x \
  "Kerr/Kerr-Schild: x-coordinate of black hole"
{
(*:*) :: ""
} 0.0

REAL Kerr_KerrSchild__y \
  "Kerr/Kerr-Schild: y-coordinate of black hole"
{
(*:*) :: ""
} 0.0

REAL Kerr_KerrSchild__z \
  "Kerr/Kerr-Schild: z-coordinate of black hole"
{
(*:*) :: ""
} 0.0

REAL Kerr_KerrSchild__t \
  "Kerr/Kerr-Schild: time offset of black hole"
{
(*:*) :: ""
} 0.0

################################################################################

#
# parameters for Majumdar-Papapetrou or Kastor-Traschen
# maximally-charged multiple black hole solution
#

INT multi_BH__nBH "multi-BH: number of black holes 0-4"
{
0:4 :: "any integer in the range [0,4]"
} 0

REAL multi_BH__Hubble "multi-BH: Hubble constant = +/- sqrt{Lambda/3}"
{
*:* :: "any real number"
} 0.0

# black hole #1
REAL multi_BH__mass1 "multi-BH: mass of black hole number 1"
{
0.0: :: "any real number >= 0"
} 0.0
REAL multi_BH__x1 "multi-BH: x coord of black hole number 1"
{
*:* :: "any real number"
} 0.0
REAL multi_BH__y1 "multi-BH: y coord of black hole number 1"
{
*:* :: "any real number"
} 0.0
REAL multi_BH__z1 "multi-BH: z coord of black hole number 1"
{
*:* :: "any real number"
} 0.0

# black hole #2
REAL multi_BH__mass2 "multi-BH: mass of black hole number 2"
{
0.0: :: "any real number >= 0"
} 0.0
REAL multi_BH__x2 "multi-BH: x coord of black hole number 2"
{
*:* :: "any real number"
} 0.0
REAL multi_BH__y2 "multi-BH: y coord of black hole number 2"
{
*:* :: "any real number"
} 0.0
REAL multi_BH__z2 "multi-BH: z coord of black hole number 2"
{
*:* :: "any real number"
} 0.0

# black hole #3
REAL multi_BH__mass3 "multi-BH: mass of black hole number 3"
{
0.0: :: "any real number >= 0"
} 0.0
REAL multi_BH__x3 "multi-BH: x coord of black hole number 3"
{
*:* :: "any real number"
} 0.0
REAL multi_BH__y3 "multi-BH: y coord of black hole number 3"
{
*:* :: "any real number"
} 0.0
REAL multi_BH__z3 "multi-BH: z coord of black hole number 3"
{
*:* :: "any real number"
} 0.0

# black hole #4
REAL multi_BH__mass4 "multi-BH: mass of black hole number 4"
{
0.0:* :: "any real number >= 0"
} 0.0
REAL multi_BH__x4 "multi-BH: x coord of black hole number 4"
{
*:* :: "any real number"
} 0.0
REAL multi_BH__y4 "multi-BH: y coord of black hole number 4"
{
*:* :: "any real number"
} 0.0
REAL multi_BH__z4 "multi-BH: z coord of black hole number 4"
{
*:* :: "any real number"
} 0.0

################################################################################

#
# parameters for Alvi spacetime
#

REAL Alvi__mass1 "Alvi: mass of BH number 1"
{
0.0:* :: "any real number >= 0"
} 1.0

REAL Alvi__mass2 "Alvi: mass of BH number 2"
{
0.0:* :: "any real number >= 0"
} 1.0

REAL Alvi__separation "Alvi: spatial separation of the black holes"
{
0.0:* :: "must be greater than m1+m2 + 2 sqrt(m1 m2)"
} 20.0

################################################################################

#
# parameters for Thorne's fake binary solution
#

KEYWORD Thorne_fakebinary__atype "Thorne-fakebinary: binary type"
{
  "constant"   :: ""
  "quadrupole" :: ""
} "constant"

BOOLEAN Thorne_fakebinary__retarded "Thorne-fakebinary: use retarded time?"
{
} "no"

# FIXME: can this really be exactly 0.0?
REAL Thorne_fakebinary__epsilon "Thorne-fakebinary: numerical fudge"
{
0.0:* :: "any real number >= 0.0"
} 1.e-16

REAL Thorne_fakebinary__separation "Thorne-fakebinary: initial separation"
{
(0.0:* :: "any real number > 0"
} 5.0

REAL Thorne_fakebinary__Omega0 "Thorne-fakebinary: initial angular frequency"
{
(0.0:* :: "any real number > 0"
} 1.0

REAL Thorne_fakebinary__mass "Thorne-fakebinary: mass"
{
(0.0:* :: "any real number > 0"
} 1.0

# FIXME: can this really be exactly 0.0?
REAL Thorne_fakebinary__smoothing \
  "Thorne-fakebinary: smoothing for Newtonian potential"
{
0.0:* :: "any real number >= 0"
} 0.0

################################################################################
##### cosmological spacetimes ##################################################
################################################################################

#
# parameters for Lemaitre-type spacetime
#

REAL Lemaitre__kappa "Lemaitre: multiplicative factor in equation of state"
{
*:* :: "any real number"
} -0.5

REAL Lemaitre__Lambda "Lemaitre: cosmological constant"
{
*:* :: "any real number"
} 1.0

REAL Lemaitre__epsilon0 "Lemaitre: density of the universe at time t=0"
{
0.0:* :: "any real number >= 0"
} 1.0

REAL Lemaitre__R0 "Lemaitre: scale factor (radius) of the universe at time t=0"
{
(0.0:* :: "any positive real number"
} 1.0

################################################################################
##
###
### parameters for Robertson-Walker spacetime
###
##
##REAL Robertson_Walker__R0 \
##  "Robertson-Walker: scale factor (radius) of the universe at time t=0"
##{
##(0.0:* :: "any positive real number"
##} 0.1
##
##REAL Robertson_Walker__rho "Robertson-Walker: density parameter"
##{
##0.0:* :: "any real number >= 0"
##} 0.1
##
##INT Robertson_Walker__k "Robertson-Walker: geometry type parameter"
##{
##-1:1:1 :: "one of the values -1, 0, 1"
##} 0
##
### true ==> include pressure terms (radiation-dominated universe)
### false ==> don't include pressure terms (matter-dominated universe)
##BOOLEAN Robertson_Walker__pressure \
##  "Robertson-Walker: are pressure terms included?"
##{
##} "true"
##
################################################################################

#
# parameters for de Sitter spacetime
#

REAL de_Sitter__scale "de Sitter: multiplicative scale factor"
{
(0.0:* :: "any positive real number"
} 0.1

################################################################################

#
# parameters for de Sitter spacetime with cosmological constant
#

REAL de_Sitter_Lambda__scale "de Sitter+Lambda: multiplicative scale factor"
{
(0.0:* :: "any positive real number"
} 0.1

################################################################################

#
# parameters for anti-de Sitter spacetime with cosmological constant
#

REAL anti_de_Sitter_Lambda__scale \
  "anti-de Sitter+Lambda: multiplicative scale factor"
{
(0.0:* :: "any positive real number"
} 0.1

################################################################################

#
# parameters for Bianchi type I cosmology
#

REAL Bianchi_I__scale "Bianchi I: multiplicative scale factor"
{
(0.0:* :: "any positive real number"
} 0.1

################################################################################

#
# parameters for Goedel spacetime
#

REAL Goedel__scale "Goedel: multiplicative scale factor"
{
(0.0:* :: "any positive real number"
} 0.1

################################################################################

#
# parameters for Bertotti spacetime
#

REAL Bertotti__Lambda "Bertotti: cosmological constant"
{
*:* :: "any real number"
} -1.0

################################################################################

#
# parameters for Kasner-like spacetime
#

# FIXME: can we somehow use the expression 2.0/3.0 for the default value?
REAL Kasner_like__q "Kasner-like: q parameter"
{
*:* :: "any real number"
} 0.66666666666666666666

################################################################################

#
# parameters for axisymmetric Kasner spacetime
#

# there are no parameters

################################################################################

#
# parameters for generalized Kasner spacetime
#

REAL Kasner_generalized__p1 "Kasner-generalized: x exponent parameter"
{
[-1.0:1.0] :: "any real number in the range [-1,1]"
} 0.1

REAL Kasner_generalized__p2 "Kasner-generalized: y exponent parameter"
{
[-1.0:1.0] :: "any real number in the range [-1,1]"
} 0.1

################################################################################

#
# parameters for Gowdy polarized wave spacetime
#

REAL Gowdy_wave__amplitude "Gowdy-wave: amplitude parameter"
{
*:* :: "any real number"
} 0.0

################################################################################

#
# parameters for Milne spacetime
#

# there are no parameters

################################################################################
##### miscellaneous spacetimes #################################################
################################################################################

#
# parameters for boost-rotation symmetricmetric spacetime
#

REAL boost_rotation_symmetric__scale "boost-rotation symmetric: length scale"
{
0.0:* :: "Positive please"
} 1.0

REAL boost_rotation_symmetric__amp \
  "boost-rotation symmetric: dimensionless amplitude"
{
0.0:* :: "Positive please"
} 0.1

REAL boost_rotation_symmetric__min_d \
  "boost-rotation symmetric: dimensionless safety distance"
{
(0.0:* :: "any positive real number"
} 0.01

################################################################################

#
# parameters for bowl (bag-of-gold) spacetime (non-Einstein)
#

KEYWORD bowl__shape "bowl: what shape of bowl should we use?"
{
  "Gaussian" :: "Gaussian bowl"
  "Fermi"    :: "Fermi-function bowl"
} "Gaussian"

BOOLEAN bowl__evolve "bowl: are we evolving the metric?"
{
} "false"

# FIXME: can this really be arbitrarily large?
# FIXME: can this be negative?
REAL bowl__strength "bowl: deformation strength"
{
0.0:* :: "any real number >= 0"
} 0.5

REAL bowl__center "bowl: deformation center"
{
(0.0:* :: "any positive real number"
} 2.5

# n.b. for bowl__shape = "Gaussian", this parameter is actually
#      sqrt(2) times the standard deviation of the Gaussian
REAL bowl__sigma "bowl: width of deformation"
{
(0.0:* :: "any positive real number"
} 1.0

REAL bowl__x_scale "bowl: scale for x coordinate"
{
(0.0:* :: "any positive real number"
} 1.0

REAL bowl__y_scale "bowl: scale for y coordinate"
{
(0.0:* :: "any positive real number"
} 1.0

REAL bowl__z_scale "bowl: scale for z coordinate"
{
(0.0:* :: "any positive real number"
} 1.0

REAL bowl__t0 "bowl: center of Fermi step in time"
{
*:* :: "any real number"
} 1.0

REAL bowl__sigma_t "bowl: width of Fermi step in time"
{
(0.0:* :: "any positive real number"
} 1.0

################################################################################

#
# parameters for constant density (Schwarzschild) star
#

REAL constant_density_star__mass "constant density star: mass of star"
{
(0.0:* :: "any positive real number"
} 1.0

# FIXME: is this default value ok? (does it give a star or a BH?)
REAL constant_density_star__radius "constant density star: radius of star"
{
(0.0:* :: "any positive real number"
} 1.0

################################################################################