Cosmological constraints on unparticle dark matter

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dc.creatorGong, Yan
dc.creatorChen, Xuelei
dc.date2008-03-21
dc.date2008-07-30
dc.date.accessioned2026-07-07T12:14:18Z
dc.date.available2026-07-07T12:14:18Z
dc.descriptionIn unparticle dark matter (unmatter) models the equation of state of the unmatter is given by $p=ρ/(2d_U+1)$, 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. For the $Λ$UDM model, in which unmatter is the sole dark matter, we find that $d_U > 60$ at 95% C.L. For comparison, in most unparticle physics models it is assumed $d_U<2$. For the $Λ$CUDM model, in which unmatter co-exists with cold dark matter, we found that the unmatter can at most make up a few percent of the total cosmic density if $d_U<10$, thus it can not be the major component of dark matter.
dc.descriptionReplaced with revised version. BAO data is added to make a tighter constraint. Version accepted for publication on Euro.Phys.J. C
dc.identifierhttps://arxiv.org/abs/0803.3223
dc.identifierhttp://arxiv.org/abs/0803.3223
dc.identifierEur.Phys.J.C57:785-789,2008
dc.identifierdoi:10.1140/epjc/s10052-008-0700-9
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/211146
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Phenomenology
dc.titleCosmological constraints on unparticle dark matter
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