title: Cosmological constraints on bulk neutrinos.
abstract: Recent models invoking extra space-like dimensions inhabited by (bulk) neutrinos are shown to have significant cosmological effects if the size of the largest extra dimension is R greater, similar 1 fm. We consider effects on cosmic microwave background anisotropies, big bang nucleosynthesis, deuterium and 6Li photoproduction, diffuse photon backgrounds, and structure formation. The resulting constraints can be stronger than either bulk graviton overproduction constraints or laboratory constraints.
authors.affiliation: Department of Physics, University of California, San Diego, La Jolla, California 92093-0319, USA. aba@fna1.gov
authors.forename: Kevork N
authors.initials: KN
authors.lastname: Abazajian
authors.forename: George M
authors.initials: GM
authors.lastname: Fuller
authors.forename: Mitesh
authors.initials: M
authors.lastname: Patel