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Interacting dark energy (IDE) scenario is a natural and important extensionto the standard $\Lambda$CDM cosmology. We develop a full numerical routine,called IDECAMB, as a patch to the public Einstein-Boltzmann solver CAMB, tosolve the background and perturbation equations of the IDE models. The IDECAMBsolver provides a unified interface for the widely studied IDE models byemploying a parametrization model with five free functions. By configuringthese five functions, one can easily map the coupled quintessence (CQ) andcoupled fluid (CF) models into the parametrization. We handle the perturbationevolutions of the CF models with the parametrized post-Friedmann (PPF) approachto avoid the possible large-scale instability. Compared with the previousestablished PPF approach whose form depends on a specific IDE model, the PPFapproach in this work are model-independent, making it easy to use. Weconstrain a specific CQ model with the IDECAMB package. The fitting results areconsistent with those obtained by Planck Collaboration, which confirms thevalidity of the package.

IDECAMB: an implementation of interacting dark energy cosmology in CAMB