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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 $rho_U(T)$ evolves dramatically differently from that for photons. For $d_U >1$, even if $rho_U(T_D)$ at a high decoupling temperature $T_D$ is very small, it is possible to have a large relic density $rho_U(T^0_gamma)$ at present photon temperature $T^0_gamma$, large enough to play the role of dark matter. We calculate $T_D$ and $rho_U(T^0_gamma)$ using photon-unparticle interactions for illustration.
The aim of this paper is the study of thermal vacuum condensate for scalar and fermion fields. We analyze the thermal states at the temperature of the cosmic microwave background (CMB) and we show that the vacuum expectation value of the energy momen
A renormalizable coupling between the Higgs and a scalar unparticle operator O_U of non-integer dimension d_U < 2 gives rise, after electroweak symmetry breaking, to a mass gap in the unparticle continuum and a shift in the original Higgs mass, which
We study interactions of unparticles ${cal {U}}$ of dimension $d_{cal {U}}$ due to Georgi with Standard Model (SM) fields through effective operators. The unparticles describe the low energy physics of a non-trivial scale invariant sector. Since unpa
We propose a construction with which to resolve the black hole singularity and enable an anisotropic cosmology to emerge from the inside of the hole. The model relies on the addition of an S-brane to the effective action which describes the geometry
An extended framework of gravity, in which the first Friedmann equation is satisfied up to some constant due to violation of gauge invariance, is tested against astrophysical data: Supernovae Type-Ia, Cosmic Chronometers, and Gamma-ray bursts. A gene