title: Noncommutativity in space and primordial magnetic field.
abstract: In this paper we show that noncommutativity in spatial coordinates can generate magnetic field in the early Universe on a horizon scale. The strength of such a magnetic field depends on the number density of massive charged particles present at a given moment. This allows us to trace back the temperature dependence of the noncommutativity scale from the bounds on primordial magnetic field coming from nucleosynthesis.
authors.affiliation: The Abdus Salam International Center for Theoretical Physics, Strada Costiera 11, Trieste, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Mazumdar
authors.forename: M M
authors.initials: MM
authors.lastname: Sheikh-Jabbari