Ghost Dark Matter
Tomonori Furukawa, Shuichiro Yokoyama, Kiyotomo Ichiki, Naoshi, Sugiyama, Shinji Mukohyama

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Abstract
We revisit ghost dark matter, the possibility that ghost condensation may serve as an alternative to dark matter. In particular, we investigate the Friedmann-Robertson-Walker (FRW) background evolution and the large-scale structure (LSS) in the GDM universe, i.e. a late-time universe dominated by a cosmological constant and ghost dark matter. The FRW background of the GDM universe is indistinguishable from that of the standard CDM universe if , where is the scale of spontaneous Lorentz breaking. From the LSS we find a stronger bound: . For smaller , ghost dark matter would have non-negligible sound speed after the matter-radiation equality, and thus the matter power spectrum would significantly differ from observation. These bounds are compatible with the phenomenological upper bound …
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