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Thermal Unparticles: A New Form of Energy Density in the Universe | Shao-Long Chen
; Xiao-Gang He
; Xue-Peng Hu
; Yi Liao
; | Date: |
26 Oct 2007 | Abstract: | Unparticle $U$ with scaling dimension $d_U$ has peculiar thermal properties
due to its unique phase space structure. We find that the equation of state
parameter $omega_U$, the ratio of pressure to energy density, is given by
$1/(2d_U +1)$ providing a new form of energy in our universe. In an expanding
universe, the unparticle energy density $
ho_U(T)$ evolves dramatically
differently from that for photons. For $d_U >1$, even if $
ho_U(T_D)$ at a
high decoupling temperature $T_D$ is very small, it is possible to have a large
relic density $
ho_U(T^0_gamma)$ at present photon temperature $T^0_gamma$,
large enough to play the role of dark matter. We calculate $T_D$ and
$
ho_U(T^0_gamma)$ using photon-unparticle interactions for illustration. | Source: | arXiv, 0710.5129 | Services: | Forum | Review | PDF | Favorites |
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