%0 Journal Article %T New and Improved Superstring Phenomenology %A Joseph D. Lykken %J Physics %D 1999 %I arXiv %R 10.1063/1.59439 %X Recent developments in string theory have important implications for cosmology. Topics discussed here are inflation, the cosmological constant, smoothing of cosmological singularities, and dark matter from parallel universes. Talk presented at the International Workshop on Particle Physics and the Early Universe (COSMO-98), 15-20 Nov, Asilomar, Monterey, CA. %U http://arxiv.org/abs/astro-ph/9903026v1