title: Constraining unparticle physics with cosmology and astrophysics.
abstract: It has recently been suggested that a scale-invariant "unparticle" sector with a nontrivial infrared fixed point may couple to the standard model (SM) via higher-dimensional operators. The weakness of such interactions hides the unparticle phenomena at low energies. We demonstrate how cosmology and astrophysics can place significant bounds on the strength of unparticle-SM interactions. We also discuss the possibility of a having a non-negligible unparticle relic density today.
authors.affiliation: Department of Physics, Brookhaven National Laboratory, Upton, NY 11973, USA. hooman@bnl.gov
authors.forename: Hooman
authors.initials: H
authors.lastname: Davoudiasl