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29 March 2024
 
  » arxiv » 0710.5129

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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
AbstractUnparticle $U$ 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
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