COSMOLOGY OF LIGHT MODULI - ART. NO. 046003

In string or M theory with a-large compactification radius, some axion like moduli can be much lighter than the gravitino. Generic moduli in gauge-mediated supersymmetry breaking models also have a mass;far belo w the weak scale. Motivated by these, we examine the cosmological impl ications of light moduli for the mass, range from the weak scale to an extremely small scale of O(10(-26)) eV, and obtain an upper bound on the initial moduli misalignment for both cases with and without late e ntropy production.