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We propose a scalar potential of inflation, motivated by modular invariantsupergravity, and compute the angular power spectra of the adiabatic densityperturbations that result from this model. The potential consists of threescalar fields, S, Y and T, together with two free parameters. By fitting theparameters to cosmological data at the fixed point T=1, we find that thepotential behaves like the single-field potential of S, which slowly rolls downalong the minimized trajectory in Y. We further show that the inflationpredictions corresponding to this potential provide a good fit to the recentthree-year WMAP data, e.g. the spectral index n_s = 0.951. The TT and TEangular power spectra obtained from our model almost completely coincide withthe corresponding results obtained from the \LambdaCDM model. We conclude thatour model is considered to be an adequate theory of inflation that explains thepresent data, although the theoretical basis of this model should be furtherexplicated.Comment: 8 pages, 8 figures and 1 tabl

ANGULAR POWER SPECTRUM IN MODULAR INVARIANT INFLATION MODEL