Phys. Rev. Lett. 99, 141301 (2007) [4 pages]Constraining Unparticle Physics with Cosmology and AstrophysicsReceived 20 June 2007; revised 17 August 2007; published 1 October 2007 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.141301
DOI:
10.1103/PhysRevLett.99.141301
PACS:
98.80.Cq, 11.15.Tk, 11.25.Hf
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