MultiModeCode: An efficient numerical solver for multifield inflation

Understand

We present MultiModeCode, a Fortran 95/2000 package for the numerical exploration of multifield inflation models.

• This program facilitates efficient Monte Carlo sampling of prior probabilities for inflationary model parameters and initial conditions and is the first publicly available code that can efficiently generate large sample-sets for inflation models with $\mathcal O(100)$ fields.
• The code numerically solves the equations of motion for the background and first-order perturbations of multi-field inflation models with canonical kinetic terms and arbitrary potentials, providing the adiabatic, isocurvature, and tensor power spectra at the end of inflation.
• For models with sum-separable potentials MultiModeCode also computes the slow-roll prediction via the $\delta N$ formalism for easy model exploration and validation.