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We study numerically and analytically the coarsening of stripe phases in twospatial dimensions, and show that transient configurations do not achieve longranged orientational order but rather evolve into glassy configurations withvery slow dynamics. In the absence of thermal fluctuations, defects such asgrain boundaries become pinned in an effective periodic potential that isinduced by the underlying periodicity of the stripe pattern itself. Pinningarises without quenched disorder from the non-adiabatic coupling between theslowly varying envelope of the order parameter around a defect, and its fastvariation over the stripe wavelength. The characteristic size of ordereddomains asymptotes to a finite value $R_g \sim \lambda_0\\epsilon^{-1/2}\exp(|a|/\sqrt{\epsilon})$, where $\epsilon\ll 1$ is thedimensionless distance away from threshold, $\lambda_0$ the stripe wavelength,and $a$ a constant of order unity. Random fluctuations allow defect motion toresume until a new characteristic scale is reached, function of the intensityof the fluctuations. We finally discuss the relationship between defect pinningand the coarsening laws obtained in the intermediate time regime.Comment: 17 pages, 8 figures. Corrected version with one new figur

Grain boundary pinning and glassy dynamics in stripe phases