Unparticles: Interpretation and Cosmology
arXiv:0805.1888
Abstract
We discuss the physical interpretation of unparticles and review the constraints from cosmology. Unparticles may be understood in terms of confined states of a strongly-coupled scale-invariant theory, where scale-invariance implies that the confined states have continuous masses. This picture is consistent with the observation that unparticle operators can be represented in terms of continuous mass fields. Finite results in scattering processes are obtained by compensating the infinite number of unparticle final states with an infinitesimal coupling per unparticle. As a result, unparticles are stable with respect to decay or annihilation to Standard Model particles, implying a one-way flow of energy from the Standard Model sector to the unparticle sector. The qualitative properties of unparticles, which result from their continuous mass nature, are unchanged in the case where scale-invariance is broken by a mass gap. Unparticles with a mass gap can evade constraints from astrophysical and 5th force considerations, in which case cosmology provides the strongest constraints.
20 pages, 3 figures, mini-review, section 2.1 corrected
References in corpus (22)
- Unparticle Physics
- Another Odd Thing About Unparticle Physics
- Deconstruction of Unparticles
- Constraining Unparticle Physics with Cosmology and Astrophysics
- Why Unparticle Models with Mass Gaps are Examples of Hidden Valleys
- Unparticles-Higgs Interplay
- Long-range Electron Spin-spin Interactions from Unparticle Exchange
- Unparticle constraints from SN1987A
- The minimal non-minimal standard model
- Unparticle Dark Matter
- Unparticle as a field with continuously distributed mass
- Long range forces and limits on unparticle interactions
- HEIDI and the unparticle
- Unparticle effects in Supernovae cooling
- Cosmological Constraints on Unparticles as Continuous Mass Scalars
- Constraints from Solar and Reactor Neutrinos on Unparticle Long-Range Forces
- Cosmological Unparticle Correlators
- Phantom Higgs from Unparticles
- Unparticle as a particle with arbitrary mass
- Unparticle physics with broken scale invariance
- Cosmological and Astrophysical Constraints on Tensor Unparticles
- Unparticles and inflation