Cosmological Constraints on Unparticles

We study the cosmological constraints on unparticle interactions and the temperature of the Universe for an unparticle sector with dimensional transmutation scale ΛU > ∼ 1 TeV. By considering thermal background quark decay to unparticles via a scalar operator of dimension dU , we show that the condition that the Universe is not dominated by unparticles at… CONTINUE READING