Fitting Formulae for Transfer Functions

D.Eisenstein, W.Hu

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Based on:

Baryonic Features in the Transfer Function: (also at astro-ph/9709112)
Power Spectra for Cold Dark Matter and Its Variants: (also at astro-ph/9710252)

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We provide here accurate fitting forms for the matter transfer function of adiabatic models, including high baryon and mixed dark matter variants.

High baryon models (use if interested in baryon oscillations significant for W_b/ W₀ > W₀h² + 0.2)

Transfer function codes


Fortran Version
C Version
SM Macro Version

Animated Parameter Variation


Baryons in high density universes
Baryons in low density universes

CDM Variants accurate for W_b/ W₀ <0.3, W_n/ W₀ <0.3

Includes degenerate mass neutrinos, cosmological constant, and spatial curvature.


Transfer function codes


Fortran Version (transfer function & power spectrum statistics combined)
C Version: (1) transfer function subroutine (2) power spectrum statistics driver
SM Macro Version (transfer function only)

Animated Parameter Variation


Redshift dependence
Neutrino density dependence
Neutrino sensitivity vs matter density

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whu@ias.edu