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Cosmological constraints on unparticle dark matter · Around

2008

Cosmological constraints on unparticle dark matter

Gong, Yan, Chen, Xuelei

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In unparticle dark matter (unmatter) models the equation of state of the unmatter is given by $p=\rho/(2d_U+1)$, where $d_U$ is the scaling factor.

Unmatter with such equations of state would have a significant impact on the expansion history of the universe.
Using type Ia supernovae (SNIa), the baryon acoustic oscillation (BAO) measurements and the shift parameter of the cosmic microwave background (CMB) to place constraints on such unmatter models we find that if only the SNIa data is used the constraints are weak.
However, with the BAO and CMB shift parameter data added strong constraints can be obtained.

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