CAMB Web Interface

Supports the April 2005 Release

Most of the configuration documentation is provided in the sample parameter file provided with the application.

This form uses JavaScript to enable certain layout features, and it uses Cascading Style Sheets to control the layout of all the form components. If either of these features are not supported or enabled by your browser, this form will NOT display correctly.

Actions to Perform

Sky Map Output:

Sky Map NSide
Beam Size (arcmin)

Vector C_l's are incompatible with Scalar and Tensor C_l's. The Transfer functions require Scalar and/or Tensor C_l's.
The HEALpix synfast program is used to generate maps from the resultant spectra.

Maximum Multipoles and k*eta

Scalar
l_max
k*eta_max

Tensor
l_max
k*eta_max

Tensor limits should be less than
or equal to the scalar limits.

Cosmological Parameters

Use Physical Parameters?
Hubble Constant
T_cmb

ombh2
omch2
omnuh2
omk

Omega_baryon
Omega_cdm
Omega_lambda
Omega_neutrino

Helium Fraction
Massless Neutrinos
Massive Neutrinos
Eqn. of State
Comoving Sound Speed

The Equation of State entry is the effective equation of state parameter for dark energy and is assumed constant. The Comoving Sound Speed parameter is the constant comoving sound speed of the dark energy; 1=quintessence.

Reionization
Include Reionization?

Use Optical Depth?

Optical Depth

Redshift
Ionization Fraction

Power Spectrum
Number
Scalar Amplitude
Scalar Spectral Index
Scalar Run Count
Tensor Spectral Index
Initial Ratio

The ratio is that of the initial tensor/scalar
power spectrum amplitudes. The vector modes
use the scalar settings.

Supply 'Number' values in each after the first,
separated by spaces.

Initial Scalar Perturbation Mode

If 'Other', use modes in the
following (totally correlated)
proportions:

For Vector Modes:

Normalization
Use the COBE Normalization?
CMB Output Scale

To get MuK², set a realistic initial scalar amplitude
(e.g., 2.3e-9) and the output scale factor to ~7.43e12; for dimensionless
transfer functions, set scalar amp to 1 and the output scale factor to 1.

Transfer Function Settings
High Precision?
kmax
k per logint
Number of Redshifts
Redshifts

kmax=0.5 is enough for sigma_8
Each redshift must be supplied, separated by spaces.
They will be sorted into descending order.

Performance and Reporting Parameters

Feedback Level
Lensing Method
Accurate BB
Accurate EE
Tensor Neutrinos

Recombination
Massive Neutrino Approx
Accurate Polarization
Truncate late radiation heirarchies

Recombination: The RECFAST+corrections option is described in http://arxiv.org/abs/astro-ph/0501672

Massive Neutrino Approximation: The series velocity weight option: switch to this approximation once non-relativistic. The fast approximation scheme is a CMB-only option, accurate for light neutrinos.

Accurate EE: Set to yes if you are bothered about percent accuracy on EE from reionization.

Tensor Neutrinos: Indicates whether or not to include neutrinos in the tensor evolution equations.

Truncate late radiation heirarchies: Indicates whether or not to turn off small-scale late tume radiation heirarchies. This is a time versus accuracy tradeoff.

Accuracy Boost

'l' Accuracy Boost

'l' Sample Boost